P0079 Code - Exhaust Valve Control Solenoid Circuit Low Bank 1

What Does P0079 Mean ?

P0079 indicates an issue that is found when the Engine Control Module (ECM) tries to control the Bank 1 exhaust valve solenoid and finds the system readings to be out of range. Specifically, this code is found when the ECM detects low system voltage. This code is similar to P0078 and P0080.

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What are the common causes of P0079 ?

Potential causes of a P0079 diagnostic trouble code may include:

• Wire harness shorted to ground
• Solenoid shorted to ground
• Faulty ECM

What are the symptoms of P0079 ?

Symptoms could include a rough idle, choppy acceleration, poor engine performance, and reduced fuel efficiency accompanied by an illuminated malfunction indicator lamp.

How do you troubleshoot P0079 ?

Because this DTC references a circuit problem, you will use a DVOM to diagnose the problem. The main focus of your attention should be the circuit between the ECM and the VVT solenoid valve, as well as the solenoid valve itself.




Connector and Harness Check – Check that the VVT solenoid valve connector is good, no bent or backed-out pins, corrosion, or water entry. Make sure the connector is firmly seated. Check the wire harness for damage, chafing, exposed or broken wires. Repair as necessary.

Voltage Check – With the engine running, you should have a minimum 13.4 V at the battery. Backprobe the VVT solenoid valve, usually located in the cylinder head or valve cover, and check for battery voltage.

• If voltage is incorrect, suspect an open circuit between the ECM and the valve. Disconnect the connector and recheck for battery voltage. If incorrect, suspect an open circuit between the ECM and the valve. Inspect the wire harness and repair as necessary.
• If voltage is correct, suspect a ground problem. With the key off and engine off, disconnect the VVT solenoid valve connector and the ECM connector. From the VVT solenoid valve connector, check both pins for short to each other and short to ground. You should measure infinite resistance to ground and across the pins. If incorrect, suspect a short circuit. Repair as necessary.

VVT Solenoid Valve Check

• Check for resistance across the solenoid valve pins. You should measure between 5 Ω and 15 Ω, depending on manufacturer and temperature. Check your manual for the proper specification. If incorrect, replace the valve.
• Check for resistance from the pins to ground. You should measure infinite resistance to ground. If incorrect, replace the valve.

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