Rear Wheel Lock Up, ABS Event, Loud Bang and a Flashing “D” on Driver Information Center (DIC) when Lightly or Moderately Accelerating, Forcing an 8-7 or 8-6 Downshift – 2019-2021 Cadillac Chevrolet GMC

NHTSA ID Number: 10219291

Manufacturer Communication Number: 21-NA-275

Summary

This service bulletin provides repair information to correct customer concerns of Rear Wheel Lock Up, ABS Event, Loud Bang and a Flashing “D” on Driver Information Center (DIC) when Lightly or Moderately Accelerating Forcing an 8-7 or 8-6 Downshift.

 


Condition

Some customers may comment on the following conditions while lightly to moderately accelerating, forcing an 8-7 or 8-6 downshift between 64-96 km/h (40-60 mph) with the transmission at operating temperature:

  • Rear wheel/tire lockup or an ABS event
  • Loud bang
  • Very hard 8-7 or 8-6 downshift
  • Feeling of hitting a large pothole or large speed bump
  • Flashing “D” on the DIC

 

Cause

This condition may be caused by an internal control valve body issue.

 

Correction

Replace the valve body assembly. Refer to Control Valve Body Replacement in SI.

 

Parts Information

Description Part Number Qty
VALVE, CONT (CT4, CT5, CT6) 24044192 1
VALVE, CONT (2020 T1 LD) 24044189 1
VALVE, CONT (Second Design 2020 and 2021 T1 HD) 24044274 1
VALVE, CONT (First Design 2020 T1 HD) 24047334 1
VALVE ASM,- CONT 1
VALVE ASM,- CONT 24043770 1
VALVE ASM,- CONT 24043767 1
SEAL, A/TRNS AUX FLUID PUMP 24047734 1
Transmission Fluid – (U.S.A.) 19352619 As Required
Transmission Fluid – (Canada) 19352620

 


25 Affected Products

Vehicles

MAKE MODEL YEAR
CADILLAC CT4 2020-2021
CADILLAC CT5 2020-2021
CADILLAC CT6 2019-2021
CADILLAC ESCALADE 2021
CADILLAC ESCALADE ESV 2021
CHEVROLET SILVERADO 1500 2020-2021
CHEVROLET SILVERADO 2500 2020-2021
CHEVROLET SILVERADO 3500 2020-2021
CHEVROLET SUBURBAN 2021
CHEVROLET SUBURBAN 1500 2021
CHEVROLET TAHOE 2021
GMC SIERRA 1500 2020-2021
GMC SIERRA 2500 2020-2021
GMC SIERRA 3500 2020-2021
GMC YUKON 2021

 


1 Associated Document

Manufacturer Communications

Bulletin No.: 21-NA-275
Date: August, 2022

https://www.nhtsa.gov/recalls?nhtsaId=10219291

MC-10219291-0001.pdf 52.879KB

MC-10219291-0001

 


 

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