What does this code mean?
The wording below belongs to the named make and communication. Match the complete code, reporting module, model year and engine before applying it.
A code identifies a detected condition, not a part that must automatically be replaced.
Manufacturer wording
Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.
P1A21-00HV Battery Contactor Control Sequence IncorrectP1A21-00HV Battery Contactor Control Sequence IncorrectManufacturer communications
9Original wording in English
JEEP
Reported code forms P1A21-00
Flash: Battery Pack Control Module (BPCM) Updates **Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes…
JEEP
Reported code forms P1A21-00
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…
JEEP
Reported code forms P1A21-00
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…
JEEP
Reported code forms P1A21-00
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)…
JEEP
Reported code forms P1A21-00
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)…
MERCEDES-BENZ
Reported code forms P1A2129 P1A2162
Vehicle intermittently does not start - Fault codes P1A2129 + P1A2162 in battery management system (N82/2)
Check vehicle applicability
9A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Fiat | 500E | 2016 |
| Fiat | 500E | 2015 |
| Fiat | 500E | 2014 |
| Fiat | 500E | 2013 |
| Jeep | WRANGLER | 2022 |
| Jeep | WRANGLER | 2021 |
| Jeep | WRANGLER 4XE | 2021 |
| Mercedes-Benz | SPRINTER 639 | Year not specified |
| Mercedes-Benz | SPRINTER 906 | Year not specified |
Before replacing a part
Record codes and freeze-frame data. Check battery condition, related codes and visible wiring or hose damage. Follow the vehicle's diagnostic procedure and test results before replacing parts.
Can I keep driving?
A code alone cannot establish whether driving is safe. A flashing malfunction light, severe shaking, overheating, oil-pressure warning or loss of braking or steering needs prompt attention. Stop in a safe place and seek assistance when control or engine safety is affected. Follow the vehicle handbook.