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AutoCodes - Generic - P0078

P0078 Code - Exhaust Valve Control Solenoid Circuit Bank 1

- Code Popularity: 19,907 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents
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What are the Possible Causes of the DTC P0078?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other 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
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How to Fix the DTC P0078?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0078 code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

Code P0078 Description

Exhaust valve timing control magnet retarder controls the shut/open timing of the exhaust valve by ON/OFF pulse duty signals sent from the Engine Control Module (ECM). The longer pulse width retards valve angle. The shorter pulse width advances valve angle.

OBDII Code P0078 - Exhaust Valve Control Solenoid Circuit Bank 1 - AutoCodes.com
P0078 Code - Exhaust Valve Control Solenoid Circuit Bank 1

Need More Information on the Code?

Need more information on how to fix the P0078 code? Get Access to Factory Service Manuals

Information for Specific Makes

  • P0078 Infiniti Exhaust Valve Timing Control Magnet Retarder Circuit Bank 1
  • P0078 KIA Exhaust Valve Control Solenoid Circuit Bank 1
  • P0078 Nissan Exhaust Valve Timing Control Magnet Retarder Circuit Bank 1

Need Help with the Code?

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Code P0078 comments

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