Cylinder 4 Deactivation/Intake Valve Control Circuit High
The P3428 code indicates that the powertrain control module (PCM) has detected a high voltage condition in the cylinder 4 deactivation/intake valve control circuit. This circuit is responsible for controlling the valve that deactivates the intake valve on cylinder 4 to improve fuel economy under light load conditions. A high voltage reading suggests a short to power, open circuit, or faulty component in the circuit, which can prevent proper valve operation and cause engine performance issues.
01. Most Common Causes
- Faulty cylinder 4 deactivation/intake valve control solenoid
- Short to voltage in the wiring harness
- Open circuit or high resistance in the control circuit
- Corroded or damaged connector at the solenoid
- Failed PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Rough idle or misfire on cylinder 4
- Reduced fuel economy
- Engine hesitation or lack of power
- Possible engine stalling
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data to confirm P3428 and check for related codes.
Step 2: Visually inspect the wiring and connector for cylinder 4 deactivation solenoid for damage, corrosion, or loose pins.
Step 3: Use a multimeter to check the control circuit voltage at the solenoid connector; should be near battery voltage with key on, engine off.
Step 4: Test the solenoid resistance; compare to manufacturer specs (typically 10-30 ohms). Replace if out of range.
Step 5: If wiring and solenoid are good, check for shorts to power or ground in the circuit and test PCM output; replace PCM if necessary.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive with this code as it can cause engine misfire, reduced performance, and potential damage to the catalytic converter. Have it diagnosed and repaired promptly.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and repair, depending on the cause. Replacing a solenoid may cost $50-$100, while wiring repairs are usually less.