Cylinder 4 Exhaust Valve Control Circuit High
The P3432 code indicates that the powertrain control module (PCM) has detected a high voltage condition in the exhaust valve control circuit for cylinder 4. This circuit is part of the variable valve timing (VVT) or cylinder deactivation system, which uses oil pressure to control valve lift. A high voltage reading typically points to a short to power, a faulty actuator, or a wiring issue.
1. Most Common Causes
- Short to battery voltage in the cylinder 4 exhaust valve solenoid signal wire
- Open circuit in the solenoid control ground
- Faulty cylinder 4 exhaust valve or cylinder deactivation solenoid (high internal resistance or open circuit)
- Damaged, corroded, or loose connector terminals at the solenoid or PCM
- Internal PCM driver failure (less common)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Rough idle or misfire on cylinder 4
- Reduced engine power and fuel economy
- Possible engine hesitation or stalling
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to retrieve freeze frame data and confirm the code.
Step 2: Visually inspect the wiring and connector at the cylinder 4 exhaust valve actuator for damage, corrosion, or short to power.
Step 3: Measure voltage at the actuator connector with key on; should be battery voltage on one pin and ground on the other. If voltage is high or erratic, repair wiring.
Step 4: Test the actuator resistance (typically 10-20 ohms). Replace if out of spec.
Step 5: Clear code and test drive. If code returns, suspect PCM issue.
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 misfire, reduced performance, and potential catalytic converter damage.
How much does it cost to fix?▼
Diagnosis typically costs $50-$150. Replacing an actuator solenoid can cost $100-$300 including parts and labor.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.