P3494 — Cylinder 12 Exhaust Valve Control Circuit Performance

What Does P3494 Mean?

P3494 is a diagnostic trouble code indicating: Cylinder 12 Exhaust Valve Control Circuit 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 P3494

⚠️ Check Engine Light (MIL) illuminated
⚠️ Cylinder 12 Exhaust Valve not meeting expected output
⚠️ Degraded performance of related system
⚠️ Reduced engine performance

Common Causes

🔍 Cylinder 12 Exhaust Valve degraded from age or contamination
🔍 Mechanical wear in Cylinder 12 Exhaust Valve or related parts
🔍 Restriction or blockage affecting Cylinder 12 Exhaust Valve
🔍 Calibration drift in Cylinder 12 Exhaust Valve

Frequently Asked Questions

What does P3494 mean?

P3494 indicates: Cylinder 12 Exhaust Valve Control Circuit Performance. The vehicle's computer has detected that the Cylinder 12 Exhaust Valve is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P3494?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P3494 for extended periods may cause additional problems.

How much does it cost to fix P3494?

Repair costs for P3494 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 12 Exhaust Valve for contamination or wear
🔧 Replace Cylinder 12 Exhaust 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.

P3494: Cylinder 12 Exhaust Valve Control Circuit Performance