"Flash: Powertrain Control Module (PCM) Updates
Jeep technical service bulletin 08-088-25 REV. A for 2024 Jeep Grand Cherokee, 2024 Jeep Grand Cherokee L and 2024 Jeep Grand Cherokee 4xe.
- Bulletin number
- 08-088-25 REV. A
- Component
- Unknown or other
- Summary
- "Flash: Powertrain Control Module (PCM) Updates. Customers must experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician must find one or more of the following Diagnostic Trouble Codes (DTCs) have been set: ● U0168 - Lost Communication With Vehicle Security Control Module. ● P0629 - Fuel Pump Control Circuit High. ● P0171 - Fuel system Lean. ● P0087 - Fuel Rail Pressure Too Low - Bank 1. Customers may also experience one or more of the following: ● Vehicle not starting. ● Variable speed fuel pump doesn't start after refueling. ● The Instrument Panel Cluster (IPC) unable to calculate the instantaneous fuel economy under heavy acceleration. ● The oxygen sensor can give incorrect values when entering Electric Vehicle (EV) mode. False fault detection is possible when this event occurs. ● The rear half shafts are damaged due to accelerating in drive with the Electronic Parking Brake (EPB) applied. In addition, the following software enhancement is available: ● Improve robustness against false failures for P219A - Bank 1 Air-Fuel Ratio Imbalance. This bulletin involves updating the PCM with the latest available software."
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