Volvo Engine D11L (Tier 4) Fault Code: PID 84 FMI 9 Road Speed

Volvo Engine D11L (Tier 4) Fault Code: PID 84 FMI 9 Road Speed

CONTROL UNIT:
Engine ECU

DETECTION CONDITIONS:
The engine control unit (E-ECU) registers that the machine speed signal (PID 84) is missing or is not arriving often enough.

SYMPTOM:
None

POSSIBLE CAUSES:
Open circuit on bus communication (cable harness).