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.

How do I fix P1A42 for Ford E-Transit?

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.

Ford E-Transit

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

This code applies to all vehicles. View generic P1A42 information →