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SaltySLT

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About SaltySLT

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  1. I just had the exact failure on my 2019 Sierra SLT as everyone else has a couple of nights ago pulling out of a hospital parking lot (fitting right?!). Same lights as everyone else: "Brake System Failure 62 MPH Top Speed", "Service ESC", "Service Trailer Brake". Like some of the others I used the MyGMC app to start the truck when it occurred. I had what felt like 50% braking power when I pulled out of the parking spot so I circled the lot found another spot and stopped the truck. I haven't seen anyone mention yet that they were able to pull the codes immediately when it happened. Well luckily I have a code reader that stays in the OBDII port at all times (the speedo and tach went out on my last truck , an '08 Z71 I bought new, a couple of times so I bought a code reader that shows live data and used that for the speedo and tach). I ran the full system diagnostic on it before I shut the truck off and had the following codes. ----Confirmed Trouble Codes Scan Report---- 3 Confirmed Trouble Codes: 1. P25A2 Brake System Control Module Requested MIL Illumination 2. P0606 Control Module Processor 3. C0021 Brake Booster Performance ----Pending Trouble Codes Scan Report---- 3 Pending Trouble Codes: 1. P25A2 Brake System Control Module Requested MIL Illumination 2. P0606 Control Module Processor 3. C0021 Brake Booster Performance ----Permanent Trouble Codes Scan Report---- 2 Permanent Trouble Codes: 1. P0606 Control Module Processor 2. C0021 Brake Booster Performance I shut the truck off and restarted and got all of the same errors so I ran it again and got 3 confirmed codes, 3 pending codes, 2 permanent codes, 2 power steering control module codes, 2 transfer case control module codes, 10 Electronic Brake Control Module Codes and 2 Engine Control Module Codes. ----Confirmed Trouble Codes Scan Report---- 3 Confirmed Trouble Codes: 1. P25A2 Brake System Control Module Requested MIL Illumination 2. P0606 Control Module Processor 3. C0021 Brake Booster Performance ----Pending Trouble Codes Scan Report---- 3 Pending Trouble Codes: 1. P25A2 Brake System Control Module Requested MIL Illumination 2. P0606 Control Module Processor 3. C0021 Brake Booster Performance ----Permanent Trouble Codes Scan Report---- 2 Permanent Trouble Codes: 1. P0606 Control Module Processor 2. C0021 Brake Booster Performance ----Power Steering Control Module Codes Scan Report---- 2 Power Steering Control Module Trouble Codes: 1. C1512 Check report for description. 2. U0415 Invalid Data Received From Anti-Lock Brake System (ABS) Control Module ----Transfer Case Control Module Codes Scan Report---- 2 Transfer Case Control Module Trouble Codes: 1. B0790 Check report for description. 2. U0401 Invalid Data Received From ECM/PCM "A" ----Electronic Brake Control Module Codes Scan Report---- 10 Electronic Brake Control Module Trouble Codes: 1. P0606 Control Module Processor 2. C0021 Brake Booster Performance 3. U0100 Lost Communication With ECM/PCM "A" 4. U0140 Lost Communication With Body Control Module 5. U0101 Lost Communication with TCM 6. U0131 Lost Communication With Power Steering Control Module 7. U026A Lost Communication with Image Processing Sensor F 8. U0151 Lost Communication With Restraints Control Module 9. U0102 Lost Communication with Transfer Case Control Module 10. U0146 Lost Communication With Gateway "A" ----Engine Control Module Codes Scan Report---- 2 Engine Control Module Trouble Codes: 1. P159F Check report for description. 2. P25A2 Brake System Control Module Requested MIL Illumination The brakes seemed normal the third time I restarted the truck and I drove it 45 minutes home like I was driving on black ice. Everyone behind me loved me by the way...... I am about 5 hours from home on a business trip but luckily I was able to get into a local dealer and they reprogrammed the BSCM the next morning and sent me on my way telling me not to use the app because it is known to cause issues. They also gave me the bulletin that is posted earlier in this thread as well basically stating that they are aware of the problem and that the app "may" cause an issue. I have had so many issues with this truck and it was in the shop almost all of December. I'll list all of the issues below for your reading pleasure. 1. When using the auto-up feature on the front windows they go halfway up and then back down. (Still not fixed because dealership can't duplicate but I have video of it doing it) 2. Right turn signal stopped working and wouldn't auto cancel after turning (took 5 weeks to get the part to fix that after they said it wasn't broken initially) 3. The stereo was playing the FM radio at the same time as music being played over bluetooth or apple carplay. (Supposedly fixed with software update) 4. Speakers would sometimes not work in the truck at all for anything including OnStar (Supposedly fixed with software update) 5. Infotainment system shuts off at random times giving a black screen with no sound and will not turn back on for 5-10 minutes if at all. (Has NOT been fixed yet) 6. Has been in the shop TWICE for water leaking into the cab. (Rear window has been resealed twice and it is still not fixed and going back a third time on Monday). 7. I received a flashing Check Engine Light about two weeks after I bought the truck. The codes I pulled showed a random/multiple cylinder misfire. The shop said no codes were showing and did nothing about it. (Fixed?) 8. Sound from front brakes the other day while moving the truck in my brothers yard (before the brake system failure). The sound is difficult to describe almost like a "whirring elephant"? I dunno. (Couldn't be duplicated by dealer when they fixed the Brake System Failure issue) I have asked GM to start the buyback/replacement process but I am hesitant to follow through because it seems like this truck has had just about every commonly known issue go wrong with it and I don't want a "new" truck that I have to go through these problems again with. I tried to upload the PDF's of the codes but it wouldn't let me. If anyone can help with that let me know.
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