| Subject: | Malfunction Indicator Lamp (MIL) Illuminated, DTCs U1961, U1983 Set |
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Brand: |
Model: |
Model Year: |
Breakpoint: |
Engine: |
Transmission: | ||
|---|---|---|---|---|---|---|---|
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from |
to |
from |
to | ||||
|
Buick |
Envision |
2021 |
2021 |
— |
— |
— |
— |
|
Cadillac |
CT4 |
2020 |
|||||
|
CT5 |
|||||||
|
Escalade Models |
2021 |
||||||
|
Chevrolet |
Corvette |
2020 |
|||||
|
Suburban |
2021 |
||||||
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Tahoe |
|||||||
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GMC |
Yukon Models |
||||||
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Involved Region or Country |
North America, Middle East, GM Korea Company, Israel, Palestine |
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Condition |
Some customers may comment that the Malfunction Indicator Lamp (MIL) is illuminated. Technicians may find the following DTCs set:
|
|
Cause |
This condition may be caused by not clearing the DTCs and also allowing a sleep cycle after programming or serial data authentication configuration. |
|
Correction |
Clear the DTCs and allow the vehicle to go into sleep mode. |
|
Version |
3 |
|
Modified |
Released June 02, 2020 November 13, 2020 – Added the Cadillac Escalade Models, Chevrolet Suburban, Tahoe and GMC Yukon Models and Warranty Information. March 08, 2021 – Added the 2021 Buick Envision and 2021 MY to CT4, CT5 and Corvette. |
Article ID: 1494
Created: March 10, 2021
Last Updated: March 10, 2021
Online URL: https://www.corvetteactioncenter.com/tech/knowledgebase/article/2020-2021-corvette-service-bulletin-20-na-123-malfunction-indicator-lamp-mil-illuminated-dtcs-u1961-u1983-set-mar-8-2021-1494.html