P349B — Cylinder 4 Deactivation/Intake Valve Performance

What Does P349B Mean?

P349B is a diagnostic trouble code indicating: Cylinder 4 Deactivation/Intake Valve Performance. This code relates to the powertrain system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of P349B

⚠️ Check Engine Light (MIL) illuminated
⚠️ Cylinder 4 Deactivation/Intake Valve not meeting expected output
⚠️ Degraded performance of related system
⚠️ Reduced engine performance

Common Causes

🔍 Cylinder 4 Deactivation/Intake Valve degraded from age or contamination
🔍 Mechanical wear in Cylinder 4 Deactivation/Intake Valve or related parts
🔍 Restriction or blockage affecting Cylinder 4 Deactivation/Intake Valve
🔍 Calibration drift in Cylinder 4 Deactivation/Intake Valve

Frequently Asked Questions

What does P349B mean?

P349B indicates: Cylinder 4 Deactivation/Intake Valve Performance. The vehicle's computer has detected that the Cylinder 4 Deactivation/Intake Valve is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P349B?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P349B for extended periods may cause additional problems.

How much does it cost to fix P349B?

Repair costs for P349B typically range from $50 to $400, depending on the root cause. Simple wiring or connector repairs are on the lower end, while component replacement costs more. A proper diagnosis ($80–$150 at most shops) will identify the exact cause before committing to expensive parts.

What To Do Next

Possible Fixes

🔧 Inspect Cylinder 4 Deactivation/Intake Valve for contamination or wear
🔧 Replace Cylinder 4 Deactivation/Intake Valve
🔧 Address any related mechanical faults

1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

P349B: Cylinder 4 Deactivation/Intake Valve Performance