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 controls the variable valve timing or cylinder deactivation system, and a high voltage reading suggests a short to power, open circuit, or faulty component. This can lead to improper valve operation, affecting engine performance and emissions.
1. Most Common Causes
- Short circuit to battery voltage (B+) in the cylinder 9 exhaust valve actuator wiring
- Cylinder 9 exhaust valve actuator/solenoid with low internal resistance or shorted coil
- Damaged connector or pin causing bridging between control and power terminals
- Internal ECM/PCM failure in the circuit driver
- Excessive resistance in the actuator ground line causing a high voltage reading
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine misfire or rough idle
- Reduced engine power and fuel economy
- Possible engine stalling
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm the code and check for additional codes.
Step 2: Visually inspect the wiring and connector for cylinder 9 exhaust valve control circuit for damage, corrosion, or shorts.
Step 3: Test the exhaust valve control solenoid resistance with a multimeter and compare to specifications.
Step 4: Check for voltage at the solenoid connector with key on; if voltage is above spec, trace the short to power.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can cause engine damage and poor performance. Immediate diagnosis is advised.
How much does it cost to fix?▼
Repair costs typically range from $150 to $400, depending on the cause and labor rates.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.