VOLVOUU Engine D11L (Tier 4) Fault Code: PID 251 FMI 2 Clock
CONTROL UNIT:
Engine ECU
DETECTION CONDITIONS:
The engine control unit (E-ECU) registers that time data is missing or is not arriving often enough.
SYMPTOM:
Limp home function activated.
POSSIBLE CAUSES:
1. Both data buses, J1939 and J1708/J1587 not functional at the same time.
2. Open circuit on bus communication (cable harness).
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