Conditions for diagnostic trouble code (DTC):
1) The engine brake is activated but the expected exhaust back pressure (EBP) is not achieved
Observable symptoms
1) Engine brake, poor brake performance/Brake performance too high
Probable cause
1) Exhaust back pressure sensor
2) Faulty connection
3) Air valve unit
4) Butterfly
5) Control valve, VCB
6) Leakage from hoses or connections
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