P0078
Exhaust Valve Control Solenoid Circuit Bank 1
Generic code
Fuel and Air Metering
High severity
Hard repair
Free on OBD DashX
Want real-world data on P0078?
See which problems come with P0078, how often it shows up in other vehicles, and how to fix it — step by step.
- Real-world fix data
- How often it happens
- Step-by-step repairs
What P0078 means
- The fault code P0078 indicates that there is an issue with the Exhaust Valve Control Solenoid Circuit for Bank 1. This may cause the engine to run poorly or not start at all.
Possible symptoms
- Illuminated check engine light
- Reduced engine power or acceleration
- Difficult starting or stalling
- Rough running engine
Possible causes
- Faulty Exhaust Valve Control Solenoid
- Damaged wiring or connections in the circuit
- Loose or corroded electrical connections
- Failed engine control module (ECM)
Related parts
- Exhaust Valve: The exhaust gases after combustion are sent out of the engine through the exhaust valve. Problems lead to harmful emissions out of limit
Possible solutions
- Replace the Exhaust Valve Control Solenoid
- Check and repair any damaged wiring or connections
- Tighten or clean any loose or corroded electrical connections
- Replace the engine control module (ECM) if necessary
Free on OBD DashX
P0078 on OBD DashX
Real-world causes, how often this code shows up, and the fix — step by step.
Open P0078 No sign-up needed · available in 10 languagesScan your own car
Read and clear fault codes, live data and service resets with the CaRPM app.