PIT5979B

Bulletin No.: PIT5979B
Published date: 05/4/2023
Preliminary Information
PIT5979B No Start, Dead Battery, Cruise Control Inoperative or
Brake Lights Stay On
Models
Brand:
Chevrolet
Model:
Blazer
Model Years:
2023
VIN:
from
All
to
All
Engine:
LSY
Transmissions:
All
Involved Region or Country North America
Condition
A vehicle may come into the shop with a no start condition due to a dead battery.
Upon inspection the dealer may nd no cause of the dead battery.
The customer may also complain that the cruise control is inoperative at times or
cuts out while driving.
The customer may also complain of the brake lights staying on at times.
Cause
Possible brake pedal position sensor calibration, sticking brake pedal or pedal
retainer not seated to ball on BSCM /master cylinder rod.
Correction:
If after a battery draw test, no draw can be found follow the steps below.
In rare instances it has been found that the plastic retainer on the brake pedal is not seated onto the ball stud on
the master cylinder. (see drawing below)
Firmly press the brake pedal two times to ensure this is seated.
You may feel or hear a click if it was not seated.
Check for the brake lights sticking on.
Apply and release the brake pedal at varying speeds multiple times while an assistant watches to see if the brake
lights stay illuminated.
If the condition can be duplicated perform a BPP learn in both the BCM and ECM and attempt to duplicate the
concern again.
If the concern is duplicated after performing a BPP learn replace the brake pedal assembly.
If the brake lights do not stay on and no other cause is found for a battery draw perform a BPP learn before
returning the vehicle to the customer.
Version History
Version
Modi ed
3
02/07/2023 - Created on.
04/06/2023- Added information about inspection of BSM rod being seated to
pedal assembly per Bill Taylor, BQM
05/04/2023- Added Brake lights stay on to title per request of Bill Taylor,
BQM
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