DTC P0AA0-66 Hybrid/EV Battery Positive Contactor Circuit - Signal Has Too Many Transitions/Events: Action
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WARNING:
The PHEV battery pack casing must not be disassembled due to the risk of exposure to high voltage. Failure to comply with this instruction may result in personal injury or death.
- DTC P0AA0-66 is triggered by DID 0x485E (counter B) reaching a threshold limit of 200 events, in many cases, resulting in the HV battery replacement. The presence of a third-party vehicle immobiliser, which interacts with the vehicle CAN network, may alter the regular start-up and shut-down routines. In particular, the operation of immobiliser model Autowatch Gen I has been found to be responsible for the accelerated count in DID x0485E that triggers DTC P0AA0-66. Complete the following steps:
- Using the Jaguar Land Rover approved diagnostic equipment, confirm P0AA0-66 COUNTER B) - TOO FREQUENT stored within the BECM
- Look for vehicle immobilizer. It will likely be fitted onto the CAN network on the passenger side under the floor - refer to illustrations
- If the immobilizer is present, please highlight to the customer this is the cause and advise any consequential loss or damage caused by the installation or use of non-approved/non-recommended parts, products or accessories will not be covered by any Jaguar Land Rover warranties - Please view the JLR Global Warranty Manual for further details
- Any further concerns raise an EPQR
- Using the Jaguar Land Rover approved diagnostic equipment, run application - ECU Diagnostics/Battery Energy Control Module (BECM)/Clear DTCs. Retest. If the fault persists, raise a Technical Assistance (TA):
- Using the Jaguar Land Rover approved diagnostic equipment, run application - ECU Diagnostics/Battery Energy Control Module (BECM)/ECU Functions/Prior Approval - Display Traction Battery Data
- Attach the Pathfinder session file using 'Pathfinder Sessions'
- Use the Diagnostic Trouble Code (DTC) as a reference number in the Customer Comments field
- Describe primary and secondary diagnostics completed