SES MIL DTC P2B87 – 2021 Buick Cadillac Chevrolet GMC

NHTSA ID Number: 10185752

Manufacturer Communication Number: PIT5804

Summary

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 technician 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.

Condition

Some customers may comment on an SES MIL and when DTC’s are checked, a P2B87 may be set. The customer will not have any additional symptoms, other than the SES MIL.

Cause

Engineering is currently working on releasing updated BCM calibrations for this concern.

Correction:

At this time, do NOT replace the G17 Heater Coolant Pump as this will not correct this concern.

Clear the DTC’s and advise the customer new calibrations will be released shortly to correct the issue. This PI will be updated when the calibrations are released.

6 Affected Products

Vehicles

MAKE	MODEL	YEAR
BUICK	ENCLAVE	2021
CADILLAC	XT5	2021
CADILLAC	XT6	2021
CHEVROLET	BLAZER	2021
CHEVROLET	TRAVERSE	2021
GMC	ACADIA	2021

1 Associated Document

Manufacturer Communications

Bulletin No.: PIT5804
Published date: 12/27/2020

MC-10185752-9999.pdf 98.04KB

Reprogramming

GM Diagnostic/Programming (TIS2Web)

Approved J2534 Device with TIS2WEB can reprogram 1996 and later All GM Modules.

To obtain the latest electronic controller calibration information for your vehicle, go to https://tis2web.service.gm.com/tis2web and enter the vehicle's 17 character Vehicle Identification Number (VIN) and select 'Get CAL ID’.

You can then compare the latest part number with the actual number installed on the vehicle to determine if a reprogram is needed.

The Service Programming System (SPS) application is part of the TIS2Web system. To program an ECU, the SPS application must communicate with the vehicle control modules using the proper J2534 programming interface tool.

The Tech 2 supports model years 1996 and beyond. With the addition of the CAN Diagnostic Interface (CANdi) module, Tech 2 is fully backward compatible with current Tech 2 functionality and operates transparently when diagnosing non-CAN-equipped vehicles.

Servicing the next generation Global A vehicles will require the diagnostic software, GDS2, Global Diagnostic System 2 running on a local PC device while the MDI is connected to the vehicle. The GM MDI is the Global Diagnostic tool for future vehicles starting with Global A vehicles.

The GM MDI was introduced in the fall of 2007 for Pass-Thru programming and offers faster programming speed. It can be used to perform Pass-Thru programming on all vehicles built since 1996 and into the future. Click here to view a list of GDS supported vehicles.

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