What Does P3479 Mean?
The PCM has detected abnormally low voltage or current in the cylinder 10 exhaust valve control circuit. This indicates a short to ground, excessive resistance, or open circuit condition in the electrical pathway.
Common Causes
30%
Short to ground in wiring harness for cylinder 10 exhaust valve control solenoid
30%
Failed exhaust valve control solenoid with internal short or low resistance
20%
Damaged or corroded electrical connector at solenoid or PCM
15%
Open circuit due to broken wire in harness
5%
PCM driver circuit failure
Diagnostic Steps
1
Step 1: Disconnect exhaust valve control solenoid connector and measure resistance; compare to specifications
2
Step 2: Check for voltage at solenoid connector with key on, engine off (KOEO)
3
Step 3: Inspect wiring harness for damage, pinched wires, or shorts to ground using multimeter continuity test
4
Step 4: Test PCM driver circuit by back-probing PCM connector and measuring voltage/current output
5
Step 5: Check all ground connections related to valve control system for high resistance
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
The PCM has detected abnormally low voltage or current in the cylinder 10 exhaust valve control circuit. This indicates a short to ground, excessive resistance, or open circuit condition in the electrical pathway.
The most common cause of P3479 (Cylinder 10 Exhaust Valve Control Circuit Low) is: Short to ground in wiring harness for cylinder 10 exhaust valve control solenoid
Typical repair costs for P3479 range from $150 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle remains drivable but may exhibit reduced power, poor fuel economy, and rough running. Extended driving may cause catalytic converter damage from improper combustion.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P3479 to identify the root cause.
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Quick Info
Category
Powertrain
System
Variable Valve Timing System
Difficulty
Type
Generic (SAE)
Recommended Tools
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