P0078 Code - Exhaust Valve Control Solenoid Circuit Bank 1

What Does P0078 Mean?

P0078 Indicates that the PCM has detected an incorrect voltage reading or degree of resistance from the VVT circuit that controls exhaust valve timing for engine bank 1.

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Possible causes

• Faulty Exhaust Valve Timing Control Magnet Retarder
• Exhaust Valve Timing Control Magnet Retarder harness is open or shorted
• Exhaust Valve Timing Control Magnet Retarder circuit poor electrical circuit connector

What are the symptoms of P0078 ?

Depending on system design, aside from the CEL, you may or may not notice any drivability symptoms. Usually, if the ECM cannot control the VVT, it will simply lock into a base position. The engine will usually run fine, but you may notice rough idle, poor performance, or poor cruising fuel economy, whether because of VVT failure or for the engine running in “limp home” mode.

How do you troubleshoot P0078 ?

• Repairing or replacing an open or short in wiring
• Replacing faulty exhaust valve control solenoid
• Replacing the ECM
• Correcting any connection issues

Searches related to P0078 - Exhaust Valve Control Solenoid Circuit Bank 1

• p0078 infiniti
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• exhaust valve timing control magnet retarder
• p0087