Overheating (fan clutch problems, radiator gunk) In addition to the above common engine problems, there are also a few worthwhile to mention problems that affect high horsepower LB7’s: Crankshafts + connecting rods break at high hp. This only happens when its really cold out. I have replaced the throttle body with a new GM piece and the code returns after the 2 trip logic. Sent FICM in to be redone b … read more. My mechanic replaced only the # 6 Injector at the time. Post #4 Check engine light code P1089. I have a hard P2495 Code - P2495 EGR cooler bypass bank 1 high circuit. 6L Turbo Diesel Current codes: p0090 Old codes: p0088, p0087Limp mode. The condition exists for greater than 4. The Engine and Transmission System is not performing as expected. A few Duramax forums said it's my FICM, any chance it could be the connection at the FICM rather than the module itself? Hate to throw a $650+ part at it if it's something else. I just bought a pre owned 2021 L5P Duramax with 42,000 miles on it. Jump I have had these two codes for months. From my googling I have not found anyone else with this problem it is completely intermittent between shutdowns new ecm new ficm new harnesses still act. My scan tool says no glow plug light illuminated. 2006 gmc 3500 xcab lb, with the LBZ. New references in Instagram's code suggest the company could be developing a paid verification feature following the rollout of a similar system at Twitter under Elon Musk. Pulled Code P0299, turbocharger underboost. New part came in and after installing it I noticed the above codes and the following issues. 6L u1000; u18000; chevrolet; silverado; 2 Answers. 01 LB7 Trouble Codes U1041 P0380 U1000 U1041. 6 l my trouble codes are p0090, p0380, p0374,p1262, p1261, p0540, u1800, p0203, p0193, p0370, p0207, p0093, what is the cause and what steps do I take to repair … read more. We show how to check the fuel system contro. It may take several minutes before P0711 code is set to indicate a failure. Long story: Has EGR deleted after it stopped. scriptures for sleep youtube In many cases, there is a defect with the shift solenoid. A poor connection at the EBCM ground is causing unnecessary replacements of brake modules. Exhaust camshaft position (CMP) actuator, bank 1-incorrect park position. The FICM monitors the status of the ignition voltage circuits and the fuel injector command circuits. At ~100 feet it went into neutral with these two codes present. Went to replace ignition switch and it created a short somewhere. OBD-II Check Engine Light Trouble Codes for the GM/GMC Duramax below: P0100 Mass or Volume Air Flow Circuit Malfunction. Let set say maybe to next day and starts - Answered by a verified Chevy Mechanic. Looked all over the Internet for a solution, …. that is 4 cylinders that belong to your failed injector #2 so it probably shut down #3, #5 and #8 as well. As far as mods go I have an airaid intake, 4 inch; mbrp straight pipe and an h and s tuner. If you’re looking to shop at IKEA online, you might be wondering how to get the bes. The dealer flashed it and then the P1098 showed up. Anyways, I primed it still no start, checked fuses and everything, finally it threw a u1800 code. hairston funeral home obituaries martinsville virginia Sep 19, 2015 · Anyways, I primed it still no start, checked fuses and everything, finally it threw a u1800 code. It took some digging, but mine was in a different spot. Definition: CAN Message Not Received FICM. The P0380 code is a diagnostic trouble code generated by an OBD-II scanner. Jan 21, 2010 · Id really appreciate it. This means the misfire code P0300 represents the same failure on a GM/GMC Duramax, Ford Powerstroke, or Dodge Cummins. 6 codes P0305 and P0205 reduced power. Conditions for Running the DTC. I did a little research and it seems like the U1000 is usually accompanied by another code …. The ECM determines that the DOC functionality has degraded below a calibrated threshold, during a regeneration event. The engine started after pumping the primer on the fuel filter housing. 2005 GMC 2500hd , Xtreme FX EFI Live v2 dsp5 , AFE intake , magnaflow 3" dp , 4" dp back flo-pro exhaust , fass lift pump. Just a FYI post incase anyone ever runs across this code. I hear what I believe a sound indicating continuous power going to the fuel pressure regulator or fuel pump. Solution: Once it is contaminated, you have to change the fuel filters and injectors. 5 gallons of DEF hoping to at least get by for a time. Hey I have a 2011 duramax and I'm getting the po341 code cam signal problem. He says that he did check continuity on all the CAN circuits and found nothing there. Replace the Engine Control Module (ECM) ECM is the computer of a car. Jump to Latest Runs great, idles great and then it just dies and gets harder to crank every time only code I have now is U1800 again. They "tested it" and said it was OK, charged me $150+ shipping. It might happen in the driveway or 4 hours later in another state. Turn the ignition off and wait a few seconds. my truck has started throwing this code p0108 going up hills after a downshift any ideal what i need to do. 2002 Chevy 2500HD LB7 Duramax craigslist red bluff housing I am having issues with a u1800 and p0090 code on my 2001 duramax with the lb7. Silverado 2500hd - Answered by a verified Auto Mechanic 2001 gmc sierra 2500hd duramax diesel, 6. I isolated it to the wiring harness, and sure enough there was a spot where a metal bracket had worn through the wiring harness. Dash showimg fuel filter change needed. Change crank and cam , new filter. Vehicle speed is more than 24 km/h (15 mph). 6 lb7! cranks no start! replaced starter, has 2 new batteries, replaced fuel filter and housing, oil changed, crank shaft sensor, key relearned, using autel scanner it shows desired / actual fuel pressure 6k psi while cranking! disconnected fuel feed to cp3 to make. Im new to the diesel world and recently purchased a 2007 gmc 2500. Continuity check across the plug. U1301 means the ECM has found fault with the data on the class 2 serial data line and the signal is always low. Come join the discussion about modifications, towing, classifieds, troubleshooting, maintenance, and more! Full Forum. So your having problems with the shift range inhibited and it’s going in to limp mode and acting weird? Well I’m here give you some help! 1. Whether you just want to be able to hack a few scripts or make a feature-rich application, writing code can be a little overwhelming with the massive amount of information availabl. check for - Answered by a verified Chevy Mechanic My 04 silverado duramax blew the edm fuse. UNBELIEVABLE!!!!! I LIVE IN TEXAS AND WONDER IF IT WILL …. Conditions for Setting the DTC. Customer: i have an 02 chevy 2500hd with the duramax. U1800 is a loss of communication somewhere in the circuit. Bassdeer Discussion starter 2 posts · Joined 2014 Add to quote; Only show this user #1 · Nov 7, 2018. I have 7 different codes coming up. Medicine Matters Sharing successes, challenges and daily happenings in the Department of Medicine The COVID-19 E210 codes for the university are as follows: COV COVID-19 Leave FCOV. Failure to communicate with fuel injector control …. P0100- mass air flow out of range P0700- trans control sys. This type of designation may refer to the engine bank but not exclusively. Sometimes between 3-4 and sometimes 4-5 and …. That's when I realized this was the same shit that happened 6-8 months ago. with air dog lift pump, race valve, egr delete, and efi reprogram, thanks to husker diesel. Accelerator pedal position is more than 6 percent. •DTC U1800, or U2104 are not set. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. I have put about 1,200 miles on it so far and just got a check engine light so I ran the code and it said P3196 and U062F. The P0380 is a powertrain code or, specifically, trouble code. I have a 2004 chevy 2500hd duramax, and it's a crank no start with an intermitten u1800 code. I have a 2005 LLY and one morning I drove it to work, got there turned the truck off and power locks were out. I have to stop and turn it off and it resets itself and then im good to go again. Obviously p205b is reductant tank temperature sensor range/performance. 2015 2500 check engine code P21DD. If the ECM fails to receive an expected message from one of the other modules, DTC U1800, U2104, or U2106 will set, depending on what communication is lost. Once started the truck runs perfectly no hesitation, studder, anything. Then on my way home the cel light came on and I looked through my cts2 and it has a bunch of communication codes, p0700, u1000, u1800, u2104,u2106, u2105. Carefully checked the wiring harness leading to FICM for broken wires. lb7 an said their was something wrong with my fuel management an they got a code of U1800 an to take it to in this thread in this sub-forum in the entire site. Failure to communicate with fuel …. No issue under power when the motor rocks away from the firewall but let off the throttle and that. The PCM sets the OBDII code when the Reductant Injector Temperature Exhaust Gas Temperature Sensor is not factory specifications. I have ran the exhaust brake and can positively say that the vanes are not stuck. This Duramax was towed in for a cranks no start condition. 5 gal just covering the 30 miles, plus the extra 1 gallon going to the 9th injector. - (Sep 26, 2017) #PIE0401 Bulletin 04-00-89-053 Engineering Information - Malfunction Indicator Lamp Illuminated with One or More Glow Plug Control DTCs Set - (Mar 9, 2017). Can take care of the P0380 but need help with P1404. 2015 Chevy 3500HD LTZ CCLB 4x4. If the computer doesn’t get the right response from the glow plug, it will set the powertrain code P0380. The trouble code U1000 is a vehicle specific code primarily found on Chevrolet, GMC and Nissan vehicles. 18071 Views 21 Replies 9 Participants Last post by aubfire64, Dec 26, 2006 Jump to Latest A. GMCU1800 GMC DTC U1800 Make: GMC Code: U1800 Definition: CAN Message Not Received FICM Description: The ignition is ON. When I started looking around under the hood the I found the tcm connector unlatched but in place. There is now a line under the gear selector and I am also able to drive it now. From what I found, a lot of people will try cleaning the sensor and wires 1st, then replacing the sensor and/or solenoid, then end up taking it to the stealership and replacing the turbo. Duramax First Generation: 2001-2004 (LB7) U1800. 4) steering wheel connector is loose. Learn about lock pick guns and the uses and ethics of loc. The automobile fault code U1800 indicates a problem with the Fuel Injector Control Module (FICM) in your vehicle. Cranks over fine but no fuel supply. Instrument Panel Cluster - 0 codes …. The MIL was on and the vehicle exhibited intermittent low power. Recently, when the weather turned cool (high 30s over night but still reaching 70-80 during the day) I began getting a CEL and the "cylinder 1 injector learning limit max" code P02CD only on start up. lil cholo drawings Here are a couple of other things to add to your to-do list: 1) clean the fuel cooler in front of the fuel tank. Yesterday morning I stopped at a donut shop to grab donuts for the work crew. Likely if there is an issue with any of those systems. It seams that the lift pump is making a strange noise during the initial key on 30 second run. The cost to diagnose the U1041 code is 1. I had that code pop up and P003A. att outage map durham nc Sometimes fixing the broken PCM module fixes the P2149 code. I have a crank no start problem throwing a U18A2 fault. Inspecting the harness usually caused the fault to disappear (for a while), before it reared it's head and killed the truck instantly. P0700 is the TCM requesting a MIL (Malfunction Indicator Light aka: "check engine"). 01 Duramax 2500HD LS CC/SB Bone Stock. #2 · Jun 9, 2017 (Edited) 1224 is Fuel Injector 1 Control Circuit Shorted. It will then perform this procedure to learn the new value. three bird nest etsy For example, you can’t even call your next door neighbor’s landline without using an area code, and you certainly can’t call mo. From reading some of @Ron Nielson link,. 2006 LBZ duramax silverado CCSB 4x4. 2005 Chevy 2500HD D-Max 419,000 miles when …. Here's the codes I was able to pull. 2) Trans fluid temp guage not working. now it will crank but not start. Dealer could not find anything wrong and reset the codes. IKEA is a popular home decor and furniture retailer that offers affordable and stylish products. I have an ultragauge I keep in my tool bag so I plugged that in and it gave me the p11d5. the indicator light is blinking. amy fan art If you look these codes up, it is a comm failure between the ECM and the FICM. My CIL came on about 2 weeks ago. the code P2149 comes on when truck gets hot and the truck loses power, how can I fix that?. Again, this is a great place to start diagnosing your P0700 codes for 2001-2004. 1waysuggs brenda grettenberger husband Applications: 2001-Early 2004 Chevy Silverado and GMC Sierra, 2001-2005 Chevy Kodiak and GMC TopKick. <---- My udder truck :cool2: Does an 18 spd qualify ya for the brotherhood of handshakers? 2004 GMC Dmax LB7/Ally 5 spd C/C, Sierra 2500HD, 4x4. went to grocery store and was inside for about 30 mins. I replace EGR valve and motor, Cleaned EGR manifold, replace EGR manifold MAP sensor, Replace MAF sensor, replace air …. Lb7 Duramax u1800 code and stutter - YouTube. I’m thinking coolant got into my ficm and fried it. idk weater this is something to be …. The P026D pending went away also. Duramax First Generation: 2001-2004 (LB7) p0090 and u1800 codes. First start of the day, every day, starts quick, easily and without a hitch. Getting three codes P0263 Cylinder 1. Jump to Latest Follow 8K views 3. 6°F), and initially a code will not be set. I primed the fuel filter without the bleeder screw in and it filled the filter as it is supposed to. 5 LB7 Duramax Powertrain A ton of "u" codes. Engine oil level/pressure, mechanical fault. GitHub has taken down a repository that contained proprietary Twitter source code after the social network filed a DCMA takedown request. Only when the truck tries to do a relearn (coolant temp 160+, at idle). P0700-transmission control system. P0093 or P1093 mean there is a large difference between the desired and actual rail pressures. If it looks burnt or has particles in it, you’ll need to replace it. I now get a code P0540 which is the Intake air …. 5-2005 (LLY) and went to Auto Zone to get the code. Many of the other threads spoke of such issue but all listed that it was one of the following issues: Vane Positon Sensor. Won't pass smog in California due to P0540. code P0090, yes many times, 2500 HD LT, Yes, replaced the FRP - Answered by a verified Chevy Mechanic. nyterydr1500 Discussion starter. P0046 turbo charger Boost control position perform. This thread is also under electrical, but I'm hoping somebody can pop the hood of their LB7 duramax and help me match wire a and wire b back together! I had a squirrel decide to chew on some electrical wiring on my truck '03 2500HD LT duramax last night. my uncle has a stock 2003 duramax with 38000 miles he just started it up today and the check engine light came on and the dash cluster lights were flashing codes were u1009 u1003 any body know what would cause these codes thanks. dani ruberti husband Intake camshaft position (CMP) actuator, bank 1 -incorrect park position. See C0055 00 - Chevrolet Diagnostic Trouble Code (DTC) Definition, Causes and Diagnosis. Checked the harness & plug for these 2 injectors had come loose. 5 LB7 Duramax Powertrain U1024 code and electrical issues. We thought that the intake air heater relay may not be working so we replaced them and still have the issues. There is a serial data network between the two Modules. but did not change it yet b/c of the U1800 code and that the fuel supply to the underhood seems to be good. Jump Conclusion - I'm a dumba$$. Jump to Latest Now the mechanic says that i have a single code U1800C and that none of his subscription services can tell him anything about this code. Shop with all 9 Babbel promo code & coupons verified for May 2023. After that, connect the scanner to the vehicle’s OBD port to obtain all of the stored codes and other relevant information. it can take 5 to 7 times of doing this. 2018 GMC Denali 3500 DRW Fuel FF 31 20” wheels, Fuel Gripper AT 285/55/20 tires. 5-10 LMM Duramax Powertrain P0401 Code. the engine was a junkyard engine pulled from a running wrecked vehicle. 6-liter Duramax diesel engine gets an EPA-estimated 15 MPGs in city driving and 20 MPGs on highway driv. Technicians may find DTC P1781 (model years 01-02) or DTC P0802 (model years 03-05) (Transmission Control Module - Incorrect Voltage Level on MIL Request Circuit) stored in the ECM. Kblaylock9244 Discussion starter. Apr 8, 2015 · strokeit355 Discussion starter. On accelerating from a stop, getting very low throttle response and a light colour white/grey smoke when bringing up RPM. Well as its gotten colder all over the country. Allison Transmission P0700 Code Help. If the truck can do 20 mpg empty, it burns 1. No more u1000 code! 22 miles per gallon on the last tank. Don't forget to hit the bell icon for notifications. 7K members Since 2005 A forum community dedicated to Chevy and GMC Duramax diesel owners and enthusiasts. Also, just to make sure you are looking …. I have ground but am not getting power and if I disconnect the ecm it still gets a very mild …. 5-05 LLY Duramax Powertrain Codes C0035 & U1000. 2004 GMC 2500HD CREW CAB SHORT BED 4X4 AT LB7 6" FABTECH LIFT S&B INTAKE STRAIGHT PIPE A forum community dedicated to Chevy and GMC Duramax diesel owners and enthusiasts. 2002 Black and Chrome Crew Cab 4x4 Duramax Autostart remote start, 18" double pumps w/ 305/55/18s, PPE Hot Xcelerator 2 E. An internal system relay in the EBCM supplies …. 5L Diesel Engine Duramax First Generation: 2001-2004 (LB7) Duramax Second Generation: 2004. LB7 code U1800 FCIM blows fuses - solved. 5 crew cab, check engine light came on after I got on it to warm engine before oil change. One guy also suggested replacing MAF Sensor. 06-07 LBZ & LLY Duramax Powertrain Help! u1000 code. replaced now only running of 4 cylinders. Please consider creating a new thread. Jan 6, 2011 · New codes are C0550, P1550, C0201, U1800 and still seeing the U1000 also. I put it back on the Economy tune the other day and the code hasn't come back yet. Usually the p0087 is caused on LLY-LMM trucks by a weak FPRV and can be shimmed for cheap. It also goes into a reduced power mode. Aug 27, 2012 · Hello, I Have an 03 Reg Cab 2500HD Duramax/Allison 4x4 all stock, throwing codes P0090 Fuel Pressure Regulator and U1800 No communication with FICM. 5 LLY, 2X, shell, XDR, MikeL Heavy duty up-grade, 6spd, TransGo, deep pan, de-badged, 65 Gallon replacement Aero tank, LBZ-mp, Kennedy …. Come join the discussion about modifications, towing, …. Also reflashed with the latest updates. I've researched so much on this topic over the last week but can't get a definite answer. Everything on this Truck from the filter head through to the. 2L Diesel Engine Suspension & Steering - 2001 - 2010 Top Contributors this Month View All. The ECM monitors CAN operational status by expecting a constant flow of messages from the FICM and the TCM. Here is a diagnostic flow chart direct from GM for problem solving a crank but doesn't fire condition on a 6. 6 diesel lly U0105 code present, 5E296069 last 8 vin wont start. The bulk of most no-start conditions on an LB7 have to do with the fuel system, some with the starting system, and occasionally there will be trouble caused by other sensors like the camshaft position sensor, crankshaft position sensor, fuel injection control module, a faulty ECM, and more. 6 2500hd duramax stall while driving. Pinned the 5 pos switch into ecu. Jump to Latest Follow 31K But I have a constant CEL code p0098. princess house crystal ebay Oct 20, 2019 · U1800 after coolant hose burst. Jul 31, 2018 · If the vehicle had only injector circuit codes for P0202 or P0207 (with bank shutdown P2146 or P2149), and the wiggle test induces a P0202 or P0207 to reset, use bulletin number 05-06-04-047B to repair the injector connectors and install the injector harness support kit. Its throwing a u1800c code which is lost communication with Fuel Injector Control Module. This code has absolutely nothing to do with turbo vanes or vanes position sensor. sat for an hour and while backing out of my parking spot transmission shifted real hard, loss of power, "service stabilitrak" message, no line under gear selector, and CEL came on. When the ignition switch is turned to the Run or Start position, current will flow through the relay coil. My code was definitely a money sign Sent from my ADR6325 using AutoGuide. Jump to Latest Follow 937 views 7. The engine light came on showing a code for mass air flow. Try retrieving the codes again, if HVAC controls light up and U1152 is now gone, replace the resist excuse me, the blower control processor. Z w/accordion boot, Bedrug, H2's, Bilsteins, Predator, VR Straps, Bowtie Flag, Mag …. 2500 chevy silveradao replaced all injectors u1800 code comes on wont start c - Answered by a verified GM Mechanic 02 duramax p0107, p0540 and u1800 cleared codes. 5, the CICS region is abending U1800 with message: 12. 5 MPG Diesel Power Challenge 2008. * The DPF Regeneration is not active. tomtord bottom tord wWHILE DRIVING, ENGINE SHUT DOWN, LIKE KEY WAS TURNED OFF. The troubleshooting flow chart says that if both of these codes come up together, to go straight to the ficm. Jump to Latest Follow 29K Pulled codes after check engine light has come on. 6 diesel u1800 code truck runs great but the sev eng lite stay on i checked all wires & conect to icm. P0336, P0340, P0370, P0374, P0380, P0601, P0602, P0603, P0604, P0611, P0612, P1621, P1626, P1631, P1683, or U1800? yes-Go to Diagnostic Trouble Code …. The fault is an open circuit, or there would be other codes present (like U2104, U2106). P0090 and Common Rail Fuel Systems. I have not seen too many FICMs fail due to water. It can also be caused by an open or shorted Electronic Brake Control Module harness. Truck runs but will not rev up has no throttle 2001 chevy 2500hd 6. Truck runs but will not rev - Answered by a verified Chevy Mechanic. If the ECM detects an excessively high IAT signal voltage, indicating a low temperature, DTC P0113 sets. Truck starts up and runs fine. The OBD2 codes have not returned since the no start a few days ago. top 10 most toxic kpop fandom These would be fuel pressure sensor codes. 5, the CICS region is abending U1800 with message: 393 security domain cannot continue, so CICS is terminated. Had a friend pull the code P1339 but everywhere I look I …. The motor, sometimes referred to as Baby Duramax, was slated to be offered in GM’s light duty pickup trucks – the Chevrolet Silverado 1500 and GMC Sierra 1500 – for the 2010 model year. 40 [Read Reviews] [Write A Review] [Add to Wishlist]. First was there also a code U1800 and does the engine start?. Connected EGR and got the clean exhaust filter and refer to owners manual …. 6 and wanted to know if anyone has came across this OBD2 code P133C ?Â. 6 diesel chevy duramax code po370 6. Got it reset, came back on 600 miles later. Its gone full range 0-100% with the exhaust brake. It would communicate with EBCM and Restraint Modules which gave me the codes. You should be aware of the signs of this code to solve the problem as soon as you can. ----Disc Player and Video Display Codes Scan Report----. P0104 Mass or Volume Air Flow Circuit Intermittent. This DTC only sets ifU1300or U1301 is not current. The engine skips/stutters when the code latches. This video details the common issues you may run in to with an LB7 Duramax. #PIP5523 DTCs P1338 P1339 P133A P133B P133C P133D P133E and / or P133F Set. Compatible with both OBDI and OBDII vehicles. 2017 Duramax engine light code P1339. cbs sports fantasy baseball rankings P0090 is fuel pressure regulator related, not the rail pressure sensor. Every search on the u1800 code comes up with the truck crank no start that I found. The EBCM monitors pump motor feedback voltage after activation …. Replaced fuel rail plug with solid plug. my 02 duramax died and wont start got a code u 1800 lost comm with fuel injection module any ideas. I found 3 different senors in the intake system have pulled all 3 out and ohmed them. I get home with the U1301 code, tried disconnecting the batteries for an hour and it didn’t work. The Crankshaft Sensor, and Camshaft Sensor are connected to the ECM. We use cookies to give you the best possible experience on our website. My 2015 has 57,000 miles on it and got this code yesterday, and its not running right now, I cant find any information on this code anyone help me out some. When it threw the codes it sounded like a thunk, clunk in driveline. Might be pushing fuel to the injectors but not holding enough pressure to start. However, final diagnostics should always be done in person by a professional. I pull a camper and a boat often therefore I don't need this issue to happen while pulling either. 6K members Since 2005 A forum community dedicated to Chevy and GMC Duramax diesel owners and enthusiasts. Mine turned out to be my # 2 injector shorting out. I did a little research and it seems like the U1000 is usually accompanied by another code and thats. I used my Snap On Solus Pro scanner and was able to check the code and operation of the control module. 3-lb7-code-u1800-fcim-blows-fuses-solved. Wiring, poor connections, FRP sensor. pulled codes from my bully dog gt tuner first one is p0090 fuel pressure regulator control circuit, 2nd is U1800 no info on that. springfield armory serial numbers lookup Reinstalled my TCM and the codes came back. zybooks java answers This list has been updated to includes Chevy/GM Duramax diagnostic trouble codes. The Diagnostic Trouble Code (DTC) P0380 indicates "Glow Plug/Heater Circuit 'A' Malfunction. Happy Easterok, so I bought a 2003 duramax with 154k on it a month or so ago and really like the truck, until I get a check engine light two days ago. 6 diesel u1800 code truck runs great but the sev eng I have a 2003 Chevy 2500HD 6. interstate 40 weather conditions salinas craigslist pets What the in this thread in this sub-forum in the entire site. P0181 fuel temp sensor malfunction. If the ECM does not have a previously learned, it will default to a stored calibrated value. Duramax is a V8 diesel engine and mounts on Chevy Silverado and GMC Sierra. The ECM detects the Park/Neutral switch signal equals 12 volts (high) when the IMS reports a Park/Neutral range for 5 seconds. As long as the light is off its probably not too serious of a problem. I put a gauge on it and even at 8psi it would throw that code. The cheap fix that will last, is to remove the connector, place it against something flat, and push a SHARP ice pick into both terminals. They have switched ownership in recent years which I have heard has greatly improved the company. When attempting to upgrade a CICS region from CTS 5. Check the FICM fuse and the connector at the FICM. The truck has an exhaust, egr delete with blocker plate, and an efi live 5 tuner. U1800 - SI2000 diag and TAC are no help Jump to Latest Follow 3K views 3 replies 4 participants last post by duramaxdr Aug 14, 2008.