Intermittent Parasitic Battery Draw / Dead Battery / Slow Crank / Radio Stays On or Fades Slowly After RAP Cancel / (LIN Bus) – 2019-2020 Chevrolet Silverado & GMC Sierra

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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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