# P0AA4 on the 2022 Jeep Wrangler

The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.

Nobody has written a description of this code yet.

## Bulletins for this model year that name P0AA4

- [11028756](https://open.wenmarpro.com/bulletins/11028756), 2026-02-12: Flash: Battery Pack Control Module \(BPCM\) Updates \*\*Customers must experience a Malfunction Indicator Lamp \(MIL\) illumination and the vehicle must SYMPTOM: exhibit/set one or more of the following Diagnostic Trouble Codes \(DTCs\): ● P0B28\-00 \- Hybrid/EV Battery “B” Voltage Unstable. ● P0BBE\-00 \- Hybrid/EV Battery Pack Voltage Variation. ● P0AA1\-00 \- Hybrid/EV Battery Positive Contactor “A” Stuck Closed. ● P0C78\-00 \- Hybrid/EV Battery System Precharge Time Too Long. ● P0CA6\-00 \- Hybrid/EV Battery Charging Current High. ● P0B24\-00 \- Hybrid/EV Battery "A" Voltage Unstable. ● P1C5E\-00 \- Hybrid/EV Battery State Of Health Failed. ● P0DAB\-00 \- Hybrid/EV Cell Balancing Performance. ● P0607\-00 \- ECU Internal Performance.\*\* \*\*Customers may also comment on the following: ● Vehicle does not start. NOTE: The no start condition is accompanied with the following DTCs: P0DAB\-00, P0607\-00, P0AA1\-00, P0AA4\-00, P0C78\-00, P0CA6\-00, P0B24\-00 and/or P1C5E\-00. P0B28\-00 will result in a MIL for 49 days. After 49 days of the MIL, the vehicle will no longer be allowed to start.\*\* This bulletin involves reprogramming the BPCM with the latest available software. NOTE: Additional module flashes are required for this update to be effective, the following modules
- [11011924](https://open.wenmarpro.com/bulletins/11011924), 2024-12-18: "Flash: Battery Pack Control Module \(BPCM\) Updates Customers may experience a Malfunction Indicator Lamp \(MIL\) illumination. Upon further investigation the technician may find one or more of the following Diagnostic Trouble Codes \(DTCs\) have been set: ● \*\*P0DAB \- Hybrid/EV Cell Balancing Performance.\*\* ● P0AA1 \- Hybrid/EV Battery Positive Contactor “A” Stuck Closed. ● P0AA4 \- Hybrid Battery Negative Contactor Circuit Stuck Closed. ● P0CA6\-00 \- Hybrid/EV Battery Charging Current High. ● P0B24\-00 \- Hybrid/EV Battery ""A"" Voltage Unstable. ● P1C5E\-00 \- Hybrid/EV Battery State Of Health Failed. ● P0BBE\-00 \- Hybrid/EV Battery pack Voltage Variation. ● P0607\-00 \- ECU Internal Performance. ● P0C78 \- Hybrid/EV Battery System Precharge Time Too Long This bulletin involves updating the BPCM with the latest available software. NOTE: Additional module flashes are required for this update to be effective, the following modules are all to be updated along with this BPCM update: ● Powertrain Control Module \(PCM\). ● Integrated Dual Charging Module \(IDCM\). ● Transmission Control Module \(TCM\). ● Hybrid Control Processor \(HCP\), Auxiliary Hybrid Control Processor \(AHCP\) also known as the Power Inverter Module \(PIM\)"
- [10248011](https://open.wenmarpro.com/bulletins/10248011), 2024-01-02: Flash: Battery Pack Control Module \(BPCM\) Diagnostic and System Updates Customers may experience a false Malfunction Indicator Lamp \(MIL\) illumination related to PHEV battery: ? P1A21\-00 \- HV Battery Contactor Control Sequence Incorrect. ? P0B3E\-00 \- Hybrid/EV Battery Voltage Sense 1 Circuit High. ? P0607\-00 \- ECU Internal Performance. ? P1E1B\-00 \- Hybrid/EV Battery Side Voltage System Isolation. ? P0AA4\-00 \- Hybrid Battery Negative Contactor Circuit Stuck Closed. This bulletin involves updating the BPCM with the latest available software. NOTE: Additional module flashes are required for this update to be effective, the following modules are all to be updated along with this BPCM update: ? Powertrain Control Module \(PCM\). ? Integrated Dual Charging Module \(IDCM\). ? Transmission Control Module \(TCM\). ? Battery Pack Control Module \(BPCM\). ? Hybrid Control Processor \(HCP\), Auxiliary Hybrid Control Processor \(AHCP\) also known as the Power Inverter Module \(PIM\).
- [10234484](https://open.wenmarpro.com/bulletins/10234484), 2023-04-17: Flash: Battery Pack Control Module \(BPCM\) Diagnostic and System Updates Customers may experience a false Malfunction Indicator Lamp \(MIL\) illumination related to PHEV battery: ? P1A21\-00 \- HV Battery Contactor Control Sequence Incorrect. ? P0B3E\-00 \- Hybrid/EV Battery Voltage Sense 1 Circuit High. ? P0607\-00 \- ECU Internal Performance. ? P1E1B\-00 \- Hybrid/EV Battery Side Voltage System Isolation. ? P0AA4\-00 \- Hybrid Battery Negative Contactor Circuit Stuck Closed. This bulletin involves updating the BPCM with the latest available software. NOTE: Additional module flashes are required for this update to be effective, the following modules are all to be updated along with this BPCM update: ? Powertrain Control Module \(PCM\). ? Integrated Dual Charging Module \(IDCM\). ? Transmission Control Module \(TCM\). ? Battery Pack Control Module \(BPCM\). ? Hybrid Control Processor \(HCP\), Auxiliary Hybrid Control Processor \(AHCP\) also known as the Power Inverter Module \(PIM\).
- [10229535](https://open.wenmarpro.com/bulletins/10229535), 2023-01-09: Flash: Battery Pack Control Module \(BPCM\) Diagnostic and System Updates This bulletin involves updating the BPCM with the latest available software. Customers may experience a false Malfunction Indicator Lamp \(MIL\) illumination related to PHEV battery: P1A21\-00 \- HV Battery Contactor Control Sequence Incorrect. P0B3E\-00 \- Hybrid/EV Battery Voltage Sense 1 Circuit High. P0607\-00 \- ECU Internal Performance. P1E1B\-00 \- Hybrid/EV Battery Side Voltage System Isolation. P0AA4\-00 \- Hybrid Battery Negative Contactor Circuit Stuck Closed.
- [10225387](https://open.wenmarpro.com/bulletins/10225387), 2022-10-31: Flash: Battery Pack Control Module \(BPCM\) Diagnostic and System Updates This bulletin involves updating the BPCM with the latest available software. Customers may experience a false Malfunction Indicator Lamp \(MIL\) illumination related to PHEV battery: P1A21\-00 \- HV Battery Contactor Control Sequence Incorrect. P0B3E\-00 \- Hybrid/EV Battery Voltage Sense 1 Circuit High. P0607\-00 \- ECU Internal Performance. P1E1B\-00 \- Hybrid/EV Battery Side Voltage System Isolation. P0AA4\-00 \- Hybrid Battery Negative Contactor Circuit Stuck Closed.
- [10225250](https://open.wenmarpro.com/bulletins/10225250), 2022-10-31: Flash: Battery Pack Control Module \(BPCM\) Diagnostic and System Updates This bulletin involves updating the BPCM with the latest available software. Customers may experience a false Malfunction Indicator Lamp \(MIL\) illumination related to PHEV battery: P1A21\-00 \- HV Battery Contactor Control Sequence Incorrect. P0B3E\-00 \- Hybrid/EV Battery Voltage Sense 1 Circuit High. P0607\-00 \- ECU Internal Performance. P1E1B\-00 \- Hybrid/EV Battery Side Voltage System Isolation. P0AA4\-00 \- Hybrid Battery Negative Contactor Circuit Stuck Closed.