VOLVOUU Engine D11L (Tier 4) Fault Code: PPID 122 FMI 4 VCB Compression Brake Status
CONTROL UNIT:
Engine ECU
DETECTION CONDITIONS:
The engine control unit (E-ECU) registers that the voltage is below 8 V (0.33 x Ubat).
SYMPTOM:
1. VCB can not be turned off.
2. Engine stops or cannot be started.
POSSIBLE CAUSES:
1. Short-circuit in cable harness.
2. Defective solenoid valve.
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