Malfunction Indicator Lamp (MIL) Illuminated with DTC P26BB Set – 2019-2022 Buick Cadillac Chevrolet GMC

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NHTSA ID Number: 10205576

Manufacturer Communication Number: 21NA256

 

Summary

This service bulletin provides repair information for dealers/technicians to correct a customer concern of a Malfunction Indicator Lamp Illuminated with DTC P26BB Set.

 

 


29 Affected Products

Vehicles

MAKE MODEL YEAR
BUICK ENCORE 2019-2022
BUICK ENCORE GX 2020-2022
CADILLAC CT4 2020-2022
CADILLAC CT5 2020-2022
CADILLAC XT4 2019-2022
CADILLAC XT5 2019-2022
CHEVROLET BLAZER 2019-2022
GMC ACADIA 2019-2022

 


Condition

Some customers may comment on a MIL illuminated in the DIC.

Technicians may find DTC P26BB set current or in recent history.

 

Cause

The causes of the condition may be due to a break-in period of the coolant flow control valve (CCV).

 

Correction

Note: For 2019 MY vehicles equipped with the 2.0L LSY, refer to Service Bulletin # 19-NA-022 first to verify the vehicle has the most current level of software.

Note: For 2019 MY and 2020 MY Chevrolet Silverado or GMC Sierra vehicles equipped with the 2.7L L3B, refer to Service Bulletin # 20-NA-100.

Note: For 2021 MY Encore GX and Chevrolet Trailblazer 1.3L L3T, refer to Service Bulletin # 20-K-010.

Note: For 2020 & 2021 MY Encore GX 2021 MY Chevrolet Trailblazer 1.2L LIH, refer to Service Bulletin # 20-K-009.

Note: This code may occur on valves with low mileage/during break-in period less than 3,200 km (2000 mi). Typically, self-resolves after further valve actuations.

Check the VIN history to determine if the code has previously set in the ECM.

 

A. If the vehicle has set a P26BB previously, replace the Coolant Flow Control Valve. If the vehicle has not set a P26BB previously, perform the latest SI diagnostic for the code.

Clear any codes and return the vehicle to the customer.

 

B. If the code is set current, and the SI diagnostic isolates the root cause to the Coolant Flow Control Valve, replace the valve and perform the scan tool control function: Engine Coolant Control Valve Mode.

The value should increase and decrease according to the command in the scan tool. Clear any codes and return the vehicle to the customer.

 

C. In the event that the customer returns with either DTC set a second time, replace the valve and perform the scan tool control function: Engine Coolant Control Valve Mode.

 



1 Associated Document

Manufacturer Communications

Bulletin No.: 21-NA-256
Date: November, 2021

https://www.nhtsa.gov/recalls?nhtsaId=10205576

MC-10205576-9999.pdf 503.044KB

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