Cylinder 3 Deactivation/Intake Valve Control Circuit Low
The P3419 code indicates that the powertrain control module (PCM) has detected a low voltage condition in the intake valve control circuit for cylinder 3's deactivation system. This system is used in some engines to disable cylinder 3 under light load to improve fuel economy. A low circuit condition typically means the voltage is below the expected threshold, often due to a short to ground, faulty actuator, or wiring issue. This can prevent proper valve operation, leading to reduced fuel efficiency and potential engine performance problems.
01. Most Common Causes
- Faulty cylinder 3 deactivation/intake valve control solenoid
- Short to ground in the control circuit wiring
- Damaged connector or poor electrical connection
- Failed PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced fuel economy
- Engine misfire or rough idle
- Decreased engine performance
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to retrieve all stored codes and freeze frame data.
Step 2: Visually inspect the wiring and connector for cylinder 3 deactivation solenoid for damage, corrosion, or loose connections.
Step 3: Measure resistance of the solenoid and compare to manufacturer specifications; replace if out of range.
Step 4: Check for short to ground by disconnecting the solenoid and measuring voltage at the harness connector with key on; if voltage is low, repair wiring.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can cause reduced fuel economy and potential engine damage if the valve is stuck in an incorrect position.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and repair, depending on the cause and labor rates.