E131 = Error testing safety relay (steering) at start-up.
Steering error
Error cause
1. Defective fuse F61
2. Defective wiring for F61
3. Defective electronic card A5
Remember its a BT truck, ANY steering fault detected on a BT truck with fly by wire steering will also stop the traction & apply the parking brake until the steering fault is cleared & truck restarted.
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