The most common causes of P1A42 include: Battery management system (BMS) malfunction; High voltage battery cell imbalance; Battery temperature sensor fault; High voltage contactor failure. A professional OBD-II scan tool is recommended for accurate diagnosis.

Recommended steps to address P1A42: (1) Schedule service as soon as possible (2) Reduce driving speed and avoid long trips (3) Monitor for additional warning messages (4) Have the vehicle diagnosed by a certified technician. Always consult a qualified EV technician for high-voltage system repairs.

Is it safe to drive with P1A42?

Driving with P1A42 is not recommended for extended distances. Schedule service within a few days to prevent further damage. Monitor for any additional warning lights.

P1A42

Warning

High Voltage Battery Mounting and Cables Fault

Severity

Warning

What does P1A42 mean?

Fault code P1A42 means "High Voltage Battery Mounting and Cables Fault". This is a Ford-specific EV diagnostic trouble code for the Ford GE1 / Blue Oval BEV platform. It is classified as "battery" with a severity level of "warning". Applicable models: Ford F-150 Lightning (2022+), Ford Mustang Mach-E (2021+), Ford E-Transit (2022+).

Possible Causes

Battery management system (BMS) malfunction
High voltage battery cell imbalance
Battery temperature sensor fault
High voltage contactor failure

Recommended Actions

1 Schedule service as soon as possible
2 Reduce driving speed and avoid long trips
3 Monitor for additional warning messages
4 Have the vehicle diagnosed by a certified technician