Error code
OBD2 P3478
OBD2P3478
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.
What it means
Cylinder 10 Exhaust Valve Control Performance.
Severity
moderateCan be driven, but performance may suffer and emissions could increase.
Summary
P3478 indicates an issue with the exhaust valve control circuit performance for cylinder 10. This code is related to the engine's internal components, specifically affecting one of its cylinders.
Common Causes
- Faulty exhaust valve control actuator or solenoid
- Electrical issues in the exhaust valve control circuit
Fixes
- Replace faulty exhaust valve control actuator or solenoid
Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.
More OBD2 codes
- P3400Cylinder Deactivation System
- P3401Cylinder 1 Deactivation/lntake Valve Control Circuit/Open
- P3402Cylinder 1 Deactivation/lntake Valve Control Performance
- P3403Cylinder 1 Deactivation/lntake Valve Control Circuit Low
- P3404Cylinder 1 Deactivation/lntake Valve Control Circuit High
- P3405Cylinder 1 Exhaust Valve Control Circuit/Open
- P3406Cylinder 1 Exhaust Valve Control Performance
- P3407Cylinder 1 Exhaust Valve Control Circuit Low
- P3408Cylinder 1 Exhaust Valve Control Circuit High
- P3409Cylinder 2 Deactivation/lntake Valve Control Circuit/Open
- P3410Cylinder 2 Deactivation/lntake Valve Control Performance
- P3411Cylinder 2 Deactivation/lntake Valve Control Circuit Low