Cylinder 3 Deactivation/Intake Valve Control Circuit Open
What does P3403 mean?
The P3403 code means the vehicle's onboard diagnostic system has detected: Cylinder 3 Deactivation/Intake Valve Control Circuit Open. This is a moderate severity code.
Common Symptoms
- Check Engine Light on
- Rough running during deactivation mode
- Engine vibration at cruise speed
- Clicking or tapping from cylinder 3 area
- Reduced fuel economy
Probable Causes (Ranked by Likelihood)
- Failed cylinder 3 deactivation solenoid Very High
- Open circuit in cylinder 3 solenoid wiring High
- Corroded connector pins Moderate
- ECM driver circuit fault Moderate
- Sludge blocking oil flow to solenoid Low
Step-by-Step Diagnostic Procedure
-
Measure cylinder 3 deactivation solenoid resistance
-
Inspect wiring and connector for open circuits
-
Verify voltage at the solenoid connector with scan tool command
-
Check oil condition for sludge buildup
-
Replace solenoid if resistance is out of specification
Frequently Asked Questions
Can engine sludge cause deactivation solenoid issues?
Yes, oil sludge can clog the small oil passages that feed the deactivation solenoids and lifters, preventing them from operating correctly.
How often should I change oil to protect the deactivation system?
Follow the manufacturer's recommended oil change intervals. For vehicles with cylinder deactivation, using the correct oil specification and changing on time is especially important.
Is there a TSB for this code on my vehicle?
Many manufacturers have issued technical service bulletins for cylinder deactivation issues. Check with your dealer or a TSB database for your specific vehicle and year.