JEEP
21-009-26
Manufacturer communications
- Publication date
- 2026-01-10
- Received by NHTSA
- 2026-01-14
- NHTSA record numbers
- 11027640
Manufacturer summary
Original wording in English
Flash: Transmission Control Module (TCM) Updates *Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle may exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs):**
• P0979-00 - Shift Solenoid 3 Control Circuit Low.
• P0219-00 - Engine Overspeed Condition.
• P0731-00 - Gear 1 Shift Incorrect Ratio. **Customers may experience the following:
• Shift shudder and shift shock during wide open throttle, high clutch energy shift.** The following software update is also included:
• Improved high RPM in coasting situations for the 1-2 shift This bulletin involves reprogramming the TCM with the latest available software.
• P0979-00 - Shift Solenoid 3 Control Circuit Low.
• P0219-00 - Engine Overspeed Condition.
• P0731-00 - Gear 1 Shift Incorrect Ratio. **Customers may experience the following:
• Shift shudder and shift shock during wide open throttle, high clutch energy shift.** The following software update is also included:
• Improved high RPM in coasting situations for the 1-2 shift This bulletin involves reprogramming the TCM with the latest available software.
Reported code forms
Manufacturer wording
Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.
Jeep
P0219-00Engine Overspeed ConditionJeep
P0731-00Gear 1 Shift Incorrect RatioJeep
P0979-00Shift Solenoid 3 Control Circuit LowCheck vehicle applicability
A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Jeep | GRAND CHEROKEE | 2018 |