What Does P3477 Mean?
The PCM has detected an open circuit or electrical discontinuity in the cylinder 10 exhaust valve control circuit. This prevents proper operation of the variable valve timing/lift system for this cylinder's exhaust valve.
Common Causes
35%
Broken or disconnected wiring in exhaust valve control solenoid circuit
30%
Failed cylinder 10 exhaust valve control solenoid with open coil
20%
Corroded or damaged electrical connector at valve control solenoid
10%
Open circuit within PCM output driver
5%
Physical damage to solenoid or wiring from engine vibration or heat
Diagnostic Steps
1
Step 1: Inspect cylinder 10 exhaust valve solenoid wiring and connector for damage, disconnection, or corrosion
2
Step 2: Disconnect solenoid connector and measure resistance across solenoid terminals; compare to manufacturer specifications
3
Step 3: Test continuity from PCM connector pin to solenoid connector throughout entire circuit
4
Step 4: Verify PCM is providing proper control signal by measuring voltage/ground at connector during operation
5
Step 5: If electrical components test normal, inspect solenoid mounting and oil passages for mechanical issues
Estimated Repair Cost
$150 - $850
Parts + labor, varies by vehicle and location
The PCM has detected an open circuit or electrical discontinuity in the cylinder 10 exhaust valve control circuit. This prevents proper operation of the variable valve timing/lift system for this cylinder's exhaust valve.
The most common cause of P3477 (Cylinder 10 Exhaust Valve Control Circuit/Open) is: Broken or disconnected wiring in exhaust valve control solenoid circuit
Typical repair costs for P3477 range from $150 to $850, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive but may experience reduced performance, rough idle, and increased emissions. Continued operation may lead to catalytic converter damage.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P3477 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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