JEEP
18-001-24 REV. C
Manufacturer communications
- Publication date
- 2024-09-07
- Received by NHTSA
- 2024-09-10
- NHTSA record numbers
- 11007658
Manufacturer summary
Original wording in English
"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:
• **P0629 - Fuel Pump Control Circuit High.
• P0171 - Fuel system Lean.
• P0087 - Fuel Rail Pressure Too Low - Bank 1.**
• P16F0-00 - SPI Comm Hardware Fault. Customers may also experience one or more of the following:
• **The rear half shafts are damaged due to pressing the accelerator in drive with the Electric Parking Brake (EPB) applied.
• The Oxygen Sensor (02) can give wrong values when entering EV mode, triggering a false MIL.
• The Instrument Cluster Panel (ICP) unable to calculate the instantaneous fuel economy under heavy acceleration.
• Variable Speed Fuel Pump inoperative after refueling (no start).**
• Intelligent sign recognition is not working properly causing degradation in active speed limiting functionality (IAP Only).
• Shifts rough occasionally when coming down to a stop.
• Shifts rough occasionally when accelerating.
• Shifts rough when transitioning from EV to Hybrid operation on low SoC.
• Shifts rough when engines starts.
• On part throttle accelerations with little to no battery available the transition from battery power to engine on is harsh and abrupt.
• The engine oil life on dashboard drops down too fast when the engine oil dilution reaches high level without the ability to recover. This bulletin involves reprogramming the PCM, Transmission Control Module (TCM) and the Auxiliary Hybrid Control Processor (AHCP) also known as Power Inverter Module (PIM), with the latest available software."
• **P0629 - Fuel Pump Control Circuit High.
• P0171 - Fuel system Lean.
• P0087 - Fuel Rail Pressure Too Low - Bank 1.**
• P16F0-00 - SPI Comm Hardware Fault. Customers may also experience one or more of the following:
• **The rear half shafts are damaged due to pressing the accelerator in drive with the Electric Parking Brake (EPB) applied.
• The Oxygen Sensor (02) can give wrong values when entering EV mode, triggering a false MIL.
• The Instrument Cluster Panel (ICP) unable to calculate the instantaneous fuel economy under heavy acceleration.
• Variable Speed Fuel Pump inoperative after refueling (no start).**
• Intelligent sign recognition is not working properly causing degradation in active speed limiting functionality (IAP Only).
• Shifts rough occasionally when coming down to a stop.
• Shifts rough occasionally when accelerating.
• Shifts rough when transitioning from EV to Hybrid operation on low SoC.
• Shifts rough when engines starts.
• On part throttle accelerations with little to no battery available the transition from battery power to engine on is harsh and abrupt.
• The engine oil life on dashboard drops down too fast when the engine oil dilution reaches high level without the ability to recover. This bulletin involves reprogramming the PCM, Transmission Control Module (TCM) and the Auxiliary Hybrid Control Processor (AHCP) also known as Power Inverter Module (PIM), 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
P0087Fuel Rail Pressure Too Low - Bank 1Jeep
P0171Fuel system LeanJeep
P0629Fuel Pump Control Circuit HighCheck 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 | 2023 |