Cylinder 3 Exhaust Valve Control Circuit Low
The P3423 code indicates that the powertrain control module (PCM) has detected a low voltage condition in the exhaust valve control circuit for cylinder 3. This circuit is part of the variable valve timing (VVT) or cylinder deactivation system, which uses oil pressure and solenoids to control valve lift. A low voltage reading suggests a short to ground, open circuit, or faulty solenoid, preventing proper valve operation and potentially causing misfires or reduced engine performance.
01. Most Common Causes
- Faulty cylinder 3 exhaust valve control solenoid
- Short to ground or open in the control circuit wiring
- Engine oil sludge or low oil pressure affecting solenoid operation
- Damaged PCM or connector issues
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine misfire or rough idle
- Reduced fuel economy and power
- Possible engine stalling
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data to confirm P3423.
Step 2: Visually inspect wiring and connector at cylinder 3 exhaust valve solenoid for damage, corrosion, or loose pins.
Step 3: Measure voltage at the solenoid connector with key on; should be near battery voltage. If low, check for short to ground or open circuit.
Step 4: Test solenoid resistance with a multimeter; compare to manufacturer specs (typically 10-20 ohms). Replace if out of range.
Step 5: Check engine oil level and condition; sludge can clog solenoid screens. Perform oil change if needed.
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 the issue can cause misfires, reduced power, and potential engine damage. Have it diagnosed promptly.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for a DIY solenoid replacement, or $150 to $400 at a shop including diagnosis and labor.