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NHTSA ID Number: 10201275
Manufacturer Communication Number: PIT5750A
Summary
This Preliminary information communicates an issue with the battery goes dead and provides diagnostics tips on inspecting the LIN bus.
Condition
Some customers may comment of a dead battery. In addition to the dead battery, they may comment on any of the following items:
– Slow engine crank
– Auto Start/Stop feature inoperative, if equipped
– Radio stays on or fading out very slowly after ignition is turned off and RAP has been cancelled
– Front or rear heated seats inoperative
– DTC’s U1524, U1526, U1555, U155D
Cause
The cause of these concerns could be the BCM staying awake due to an input from a LIN Bus. It can be difficult to diagnose these types of cases. Many are misdiagnosed as the BCM being at fault and it is then unnecessarily replaced. There are two known areas that have been found, which can short out LIN Bus circuits 6133 and/or 4115 for the front/rear heated seats. If this happens, it can cause the BCM to stay awake and draw down the battery.
NOTE: Even if a truck is NOT equipped with rear heated seats, these circuits are still in the harness.
4 Affected Products
Vehicles
| MAKE | MODEL | YEAR |
| CHEVROLET | SILVERADO 1500 | 2019 |
| CHEVROLET | SILVERADO 2500 | 2020 |
| GMC | SIERRA 1500 | 2019 |
| GMC | SIERRA 2500 | 2020 |
1 Associated Document
Manufacturer Communications
Bulletin No.: PIT5750A
Published date: 06/10/2021
https://www.nhtsa.gov/recalls?nhtsaId=10201275
MC-10201275-9999.pdf 567.537KB
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SEOCONTENT-START
Bulletin No.: PIT5750A Published date: 06/10/2021 Preliminary Information PIT5750A Diagnostic Tip – Intermittent Parasitic Battery Draw / Dead Battery / Slow Crank / Radio Stays On or Fades Slowly After RAP Cancel / (LIN Bus) Models Brand: Chevrolet Chevrolet GMC GMC Model: Silverado 1500 (New Model) Silverado Sierra 1500 (New Model) Sierra Model Years: 2019 2020 2019 2020 VIN: from to All All All All All All All All Engine: All All All All Transmissions: All All All All Involved Region or Country North America Condition Some customers may comment of a dead battery. In addition to the dead battery, they may comment on any of the following items: – Slow engine crank – Auto Start/Stop feature inoperative, if equipped – Radio stays on or fading out very slowly after ignition is turned off and RAP has been cancelled – Front or rear heated seats inoperative – DTC’s U1524, U1526, U1555, U155D Cause The cause of these concerns could be the BCM staying awake due to an input from a LIN Bus. It can be diffcult to diagnose these types of cases. Many are misdiagnosed as the BCM being at fault and it is then unnecessarily replaced. There are two known areas that have been found, which can short out LIN Bus circuits 6133 and/or 4115 for the front/rear heated seats (example Document ID 4938095). If this happens, it can cause the BCM to stay awake and draw down the battery. NOTE: Even if a truck is NOT equipped with rear heated seats, these circuits are still in the harness. Correction: Inspect the two following areas: 1. Inspect under the left rear seat (1) for the body harness being pinched where the seat back is attached to the back of cab, as shown below. Call out 2 is connector X370 and this picture was taken from a truck which did not have rear heated seats. In this scenario, LIN Bus circuit 6133 was shorted to the B+ circuit in the harness. 2. Inspect connector X225 for terminal issues/corrosion (3), as shown below. In this scenario, the LIN Bus circuit 4115 was corroded and shorting to other terminals in the connector. If corrosion is found at X225 inspect for a water leak. One known leak location is the A pillar grommet for the door pass through connector not being fully seated. If any issues are found then follow SI Wiring and Connector repair instructions to correct the concern. Warranty Information For wiring repairs covered under warranty, please refer to latest version of bulletin 10-00-89-005 for warranty information on wire/connector repairs. Version History Version 2 Modified 06/10/2020 – Created on. 06/10/2021 – Update step 2 of the correction sections.
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