Cylinder 5 Deactivation/Intake Valve Control Circuit Low
The P3435 code indicates a low voltage condition in the cylinder 5 deactivation/intake valve control circuit. This circuit is part of the cylinder deactivation system (e.g., Active Fuel Management or Variable Cylinder Management) that shuts down cylinders under light load to improve fuel economy. A low voltage reading suggests a short to ground, open circuit, or faulty component in the solenoid or wiring. This can prevent the valve from operating correctly, causing the cylinder to remain active or fail to deactivate, leading to performance issues.
01. Most Common Causes
- Faulty cylinder 5 deactivation/intake valve solenoid
- Short to ground in the control circuit wiring
- Open circuit or high resistance in the wiring or connector
- Corroded or damaged connector at the solenoid
- Engine control module (ECM) failure (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced fuel economy
- Rough idle or misfire on cylinder 5
- Loss of power or hesitation during acceleration
- Possible engine stalling
03. Step-by-Step Diagnosis
Step 1: Scan the vehicle for codes and record freeze frame data.
Step 2: Visually inspect the wiring and connector for cylinder 5 deactivation solenoid for damage, corrosion, or loose connections.
Step 3: Measure resistance of the solenoid; compare to manufacturer specs (typically 20-30 ohms).
Step 4: Check for voltage at the solenoid connector with the engine running; should see battery voltage on the supply wire.
Step 5: Perform a continuity test from the solenoid to the ECM; repair any open or short circuits found.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances. The cylinder deactivation system may malfunction, causing rough running, reduced fuel economy, and potential engine damage if the valve sticks or causes a misfire.
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 can cost $100-$200, while wiring repairs may be less. ECM replacement is rare and more expensive.