Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer has detected a problem with the control circuit for the exhaust valve in cylinder number 10. It's like a switch isn't working properly, and the car can't open or close a valve as it should.
The engine control module (ECM) monitors the exhaust valve control circuit for each cylinder. If it detects a low voltage condition in the circuit for cylinder 10, it triggers the P3479 code.
The P3479 code is set when the ECM detects a low voltage condition in the exhaust valve control circuit for cylinder 10. This may be due to a faulty solenoid, wiring issues, or a problem with the ECM itself.
• Check Engine Light illuminated
• Reduced engine performance
• Engine misfires
• Faulty exhaust valve control solenoid
• Damaged or corroded wiring or connectors
• Faulty ECM
ECM: Engine Control Module
OBD-II: On-Board Diagnostics, Second Generation
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for damage or corrosion.
• Test the exhaust valve control solenoid for proper operation.
• Replace the faulty exhaust valve control solenoid.
• Repair or replace damaged wiring or connectors.
• Reprogram or replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Socket set
$150 - $500
Moderate
• Chevrolet Silverado
• GMC Sierra
• Cadillac Escalade
• Regularly inspect and maintain engine wiring.
• Ensure proper engine maintenance and oil changes.
• Avoid harsh driving conditions when possible.
Engine Performance
• Address the issue promptly to avoid further engine damage.
• Consult with a qualified mechanic for accurate diagnosis.
• Regular maintenance can prevent similar issues.
Check with the vehicle manufacturer for warranty coverage on engine components.
This code is commonly associated with GM vehicles using Active Fuel Management systems.
Moderate – It should be addressed soon to prevent potential engine damage.
Driving with this code can lead to increased emissions and potential engine damage. Address promptly.
• Engine running at operating temperature
• Vehicle in drive mode
The exhaust valve control solenoid is located on or near the cylinder head of cylinder 10.
Q: Can I drive with a P3479 code?
A: While you may be able to drive, it's not recommended as it can lead to engine damage.
Q: How do I clear a P3479 code?
A: After repairs, use an OBD-II scanner to clear the code. If the issue is fixed, it should not return.
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Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
Helpful for checking voltage drops, grounds, and basic circuit health when modules are not communicating.
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Universal · Wire connectors and repair kit
Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
Useful if diagnosis points toward damaged connectors, wiring, or terminal repairs.
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Fitment Required · Vehicle-fitment part
Commonly relevant for misfire, ignition-efficiency, and some drivability-related repairs.
Misfire and ignition-related faults commonly involve spark plugs as part of the repair path.
Check the correct plug type, gap, and engine application for your vehicle.
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Fitment Required · Vehicle-fitment part
Relevant when the fault points toward ignition-coil performance or cylinder-specific ignition issues.
Some ignition faults involve coil performance or cylinder-specific coil problems.
Match the coil to your engine and confirm the failed component before ordering.
View options on AmazonThese parts may be related to this fault category, but a code by itself does not confirm exact fitment or guarantee that replacing a part will solve the problem.