P0478

Technical Definition:

Exhaust Pressure Control Valve High

Trouble Code: P0478
Address: 0x0478
System: Powertrain
Subsystem: Auxiliary Emission Controls
Technical Description:

Possible Causes:

Possible Symptoms:

Exhaust Pressure Control Valve High

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Faulty Exhaust Back Pressure Valve
– Exhaust Back Pressure Valve harness is open or shorted
– Exhaust Back Pressure Valve circuit poor electrical connection

Specific Makes:

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