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Found 8 results

  1. Sharing experience for your info and any ideas you might have. My shiny new 2021 GMC Sierra Denali 3.0 Duramax Diesel with 4900 miles on it has been losing its mind. I get multiple, rotating DIC messages: “Service ESC”, “Service Parking Brake”, “Service ABS”, “Adaptive Cruise Control Disabled”, “Steering Assist Reduced Drive with Care”, . . . ). The error messages come with other “benefits” besides disabled cruise control. I also enjoy no GPS signal, no Blind Spot sensors, no collision avoidance sensors, and who knows what else. Fortunately, the diagnostic codes were stored so the tech could see them, and I provided video of the DIC messages each time, too. They are on their 4th attempt to repair it now. First time, they replaced the Exhaust Particulate Matter Sensor (4025920) . Second time, they tried the same thing and replaced the Exhaust Particulate Matter Sensor, again. The 3rd time, they inspected the engine harness but found no damage so they replaced the pigtail to the Exhaust Particulate Matter Sensor and followed an 8 hr rest cycle and road test protocol. It worked for about 2 hours after I picked it up, then everything lit up again. This (4th) time, they are saying they will replace the entire wiring harness per GM’s direction. I do not want to use Florida’s Lemon Law, but I am starting the process just to be safe. BTW, I’m also getting the “long-crank/no-start” issue. They just applied the ECM update per TSB for this problem, so we’ll see if that worked when/if I get to keep the truck more than a couple hours between service appointments. I was having issues with the passive locking feature where the truck locks the doors a few seconds after I get out with the key in my pocket. It would not work even when set to on. Now that they did the Infotainment software update (V155) this seems to be fixed. I’m still having false messages that the SD Card for the Navigation System has been removed when it has not been. GM has a bulletin out so they know about this issue, but it appears there is no fix action on this one yet. After looking up each code listed on the repair orders (RO’s), I believe the main harness is a very likely cause of all the DIC error messages and system failures. Otherwise, all those modules and sensors involved have gone bad simultaneously. I suppose a power surge of some kind could do that, but then it seems the modules would not work fine in the short time between repairs. Here are the codes the tech reported on the last two Repair Orders (bold codes where noted on both RO’s): 2/5/22: B1A01 Speaker 1 General Electric Failure B395B Side View Camera Left P1488 Particulate Matter Sensor Protection Tube Performance U0020 Low Speed CAN Bus U0022 Low Speed CAN Communication Bus (+) Low U0077 Control Module Communication Chassis Expansion CAN Bus U0121 Lost Communication with Electronic Brake Control Module U0151 Lost Communication with Inflatable Restraint Sensing and Diagnostic Module U0155 Lost Communication with Instrument Panel Cluster Control Module U0184 Lost Communication with Radio Unit U0415 Invalid Data Received From Electronic Brake Control Module U0422 Invalid Data Received From Anti-Lock Brake System Control Module 2/10/22: B0967 Parking Aid On/Off Switch Circuit Short to Ground B1AO1 Speaker 1 General Electric Failure P1488 Particulate Matter Sensor Protection Tube Performance U0077 Control Module Communication Chassis Expansion CAN Bus U0121 Lost Communication with Electronic Brake Control Module U0131 Lost Communication with Power Steering Control Module U0151 Lost Communication with Inflatable Restraint Sensing and Diagnostic Module U0184 Lost Communication with Radio Unit U0415 Invalid Data Received From Electronic Brake Control Module U0421 Invalid Data Received From Suspension Control Module U0422 Invalid Data Received From Anti-Lock Brake System Control Module
  2. I am swapping the engine from a wrecked 98 Chevy Cheyenne to a 92 Chevy Silverado. Can I just swap the engines and will it just work? Are the wiring harnesses compatible? I have heard that there is an adapter that is required, but I don't know if this is accurate information.
  3. I installed a new JVC radio in my truck but both the driver and passenger speaker are not making any sounds. I suspect it's the wire harness not aligning with factory harness. Where can I find the right wiring diagram to rewiring the aftermarket wiring harness?
  4. Good afternoon,. I have a 2015 GMC 2500HD SLE. The truck didn't come with the factory fog lights so I am trying to install them. I ordered the forward object alarm wiring harness (GM part #23261394) which was found to be the harness providing power to the fog lights and object sensors on the front bumper. My ultimate goal is to try and power the fog lights through the factory harness and headlight/fog light switch on the dashboard. The harness arrived and now I need to find out where the harness plugs into the vehicle. I have attached a photo of the harness and was hoping that someone with a GMC2500 with factory fog lights could do me a huge favor. Could someone please take 15 minutes to peek under your truck and follow the fog light wires out and locate where the harness connects to the truck? I would greatly appreciate it. I tried to find an empty spot, but didn't have much luck. Thank you in advance.
  5. Hey, everyone! I’m new to the forum and I would really appreciate any help y’all could give me. About a year ago I got a 2004 Chevy Silverado and I’ve loved it so far. It’s so much better than my old Ford Ranger. However, about a couple months ago, my back left signal light went out, and as a result, my front left blinker started to naturally blink much faster. That’s obviously to be expected. I went out and got a new bulb and it fixed it right up. This week, I realized that both of my back taillights were looking very poor and needed an upgrade, so I went ahead and purchased some direct replacements. They’re the same OEM style, and fit right in. I also bought some LED bulbs to go in them, so I didn’t have to worry about the dumb halogens anymore. 3157 bulb numbers for the reverse light, the signal lights, and the brake lights. Three bulbs per housing. The new taillights came with the wiring and connectors for the junction box right next to the spare tire as well, so I went ahead and replaced it all completely. All the lights work, however the left front and rear blinkers still blink very rapidly. I don’t know why this is. I’ve tried checking the connection on the connectors, I’ve made sure the bulbs are seated good in the sockets, and I’ve even gone as far as testing different bulbs. It still seems to flash rapidly. The right side seems fine at the moment, it’s the left side that has me wanting to break me some taillights. This is the interesting part though, when I turn on the hazards, all the lights blink normally, at a regular speed. It’s only when I use the blinker that they begin to spaz. I’m just wondering if maybe anyone has any idea what’s going on here. Any suggestions? I’ve already spent about a total of $200 trying to get these things to be kind to me, so I don’t really want to drop another $300 on complete aftermarkets. I like the “upgraded stock” look. Thanks in advance! Neal
  6. I happen to have a truck (Denali) with the center console as the only seat option, but needed the extra 6th seating position for my family. As such, I acquired the jump seat components on eBay and performed the seat/console swap this week. The conversion was pretty simple after getting everything apart (other than discovering I have a hole in the carpet where the bose subwoofer was located to deal with now). I have all the power connections and receptacle items in the dash part working just fine, but I dont see where the harness on the jump seat can plug into the existing harness I have left over from my console. I know there are over 60 pages of console swap threads devoted to doing this in the other direction, but has anyone solved the wiring for the jump seat from the existing console harness? Below are a few pictures. One of the new jump seat harness connectors. One of the existing console connectors (used and not used) and a second of lower connectors at the dash, which could be extended? I looked at GM parts express wiring diagrams and I am not confident I have been able to locate the correct information yet. Please let me know your thoughts if you have an idea about how to get the jump seat wiring to work correctly. FYI- I am not interested in selling my console pieces at this time, but I will post an add if that changes.
  7. hello everyone at the GM truck forum. I'm new here and my name is Doug. yes, I need some help locating an engine wiring harness for a 1997 GMC C1500 SL 4.3 6cyl truck. I tried to use an engine harness from a suburban, same year, but from a v8 engine and just couldn't get the check engine light to turn off and the maf sensor package would not install. I live in California so I must get it installed correctly if I am ever gonna get this truck to pass the smog test to complete my registration. So I am asking for any help that could be given here at the forum. Hopefully the name of a parts store or website that will carry the part that I need. Or, maybe even better yet, the actual part itself. Wouldn't that be a hoot! Well thank you for your time and allowing me to join this forum. Kindest regards, Doug dacobalis
  8. i have a 99 sierra 2500 and want to drop a 2013 sierra 2500 engine into it. my question is, how hard will it be to do this. i am mechanically inclined and know i can mechanically fit this engine in my 99 by modifying a few things, but i am concerned on the electrical. i know i will have to use the ecu and wiring harness off the 2013 but i definitely need advise before i get into this massive project. i have the complete totaled doner car so i can use whatever i need of that. i am really concerned with the electrical and how to connect it to my 99. will this be possible? easy as plug and play? thanks so much in advance.
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