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
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