Cylinder 10 Deactivation/Intake Valve Control Circuit High
The P3476 code indicates a high voltage condition in the cylinder 10 deactivation/intake valve control circuit. This circuit is part of the cylinder deactivation system (e.g., Active Fuel Management or Dynamic Fuel Management) that shuts down cylinders under light load to improve fuel economy. A high voltage reading suggests a short to power, a faulty actuator, or a wiring issue. This can prevent proper valve operation, leading to misfires, reduced performance, and potential engine damage if ignored.
1. Most Common Causes
- Short circuit to battery voltage (B+) in the wiring of the cylinder 10 deactivation solenoid control circuit
- Faulty cylinder deactivation solenoid / oil control valve for cylinder 10 (internal short circuit)
- Damaged, corroded, or pushed-back terminals in the solenoid connector
- Faulty powertrain control module (PCM/ECM) with internal driver shorted high
- Solenoid ground circuit issues (less likely for a high code, but possible on low-side drivers with internal pull-up)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine misfire or rough idle
- Reduced fuel economy
- Loss of power or hesitation during acceleration
3. Step-by-Step Diagnosis
Step 1: Scan for additional codes and freeze frame data to confirm conditions.
Step 2: Visually inspect the wiring and connector at cylinder 10 deactivation solenoid for damage, corrosion, or shorts.
Step 3: Measure voltage at the solenoid connector with key on; should be near battery voltage. If high (e.g., >12.6V), check for short to power.
Step 4: Test the solenoid resistance (typically 20-30 ohms). Replace if out of spec.
Step 5: If wiring and solenoid are good, suspect ECM fault; perform ECM pin-out tests or consult service manual.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. Driving with a high voltage condition can cause further damage to the solenoid, wiring, or ECM, and may lead to engine misfires or stalling. Have the vehicle diagnosed and repaired promptly.
How much does it cost to fix?▼
Repair costs typically range from $150 to $400, depending on the cause. A solenoid replacement is around $100-$200 for parts plus labor; wiring repairs are less; ECM replacement can exceed $500.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.