BUICK, CADILLAC, CHEVROLET, GMC
PIT5804
Manufacturer communications
- Publication date
- 2020-12-27
- Received by NHTSA
- 2021-01-25
- NHTSA record numbers
- 10185752 · 10187203
Multiple filings of the same bulletin are grouped here; original record numbers remain available.
Manufacturer summary
Original wording in English
This Preliminary information communicates that a customer may bring a vehicle in with an SES light on. If the technician finds a code P2B87 (auxiliary coolant pump underspeed) set in the ECM they are directed to not replace the G17 heater coolant pump because this will not fix the concern. The techician is instructed to clear the code and release the vehicle to the customer with the explanation that an updated calibration will be released in the future to address the code setting.
Reported code forms
Manufacturer wording
Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.
Buick
P2B87auxiliary coolant pump underspeedCadillac
P2B87auxiliary coolant pump underspeedChevrolet
P2B87auxiliary coolant pump underspeedGMC
P2B87auxiliary coolant pump underspeedCheck vehicle applicability
A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.