Cylinder 9 Exhaust Valve Control Circuit High
The P3472 code indicates that the powertrain control module (PCM) has detected a high voltage condition in the exhaust valve control circuit for cylinder 9. This circuit is responsible for controlling the exhaust valve timing or lift, often in engines with variable valve timing (VVT) or cylinder deactivation systems. A high voltage reading typically suggests a short to power, a faulty actuator, or a wiring issue. This can lead to improper valve operation, affecting engine performance and emissions.
01. Most Common Causes
- Short to power in the exhaust valve control circuit
- Faulty exhaust valve actuator (solenoid or motor)
- Damaged wiring or connector at cylinder 9
- Corroded or loose electrical connections
- Failed PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Rough idle or misfire on cylinder 9
- Reduced engine power and fuel economy
- Possible engine knocking or hesitation
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to retrieve all codes and freeze frame data.
Step 2: Visually inspect the wiring and connector for cylinder 9 exhaust valve control circuit for damage, corrosion, or shorts.
Step 3: Measure voltage at the actuator connector with key on, engine off; compare to manufacturer specs (typically 5V or 12V reference).
Step 4: Test the exhaust valve actuator resistance and operation using a multimeter or actuator test function.
Step 5: If circuit and actuator are good, check for PCM issues or perform a relearn procedure.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can cause engine misfire, reduced performance, and potential damage to the catalytic converter or engine.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and simple repairs like wiring fixes, but can be higher if the actuator or PCM needs replacement.