P0476 Code: Exhaust Pressure Control Valve A Range/Performance
🟠 Moderate severity · drivable
Drivable, but the valve is not working as it should, which can cause rough idle and poor cold starts; fix it soon.
What P0476 means
The exhaust pressure control valve is present, but it is not moving or performing within the range the engine computer expects. The valve may be sticking partway, leaking, or responding slowly. Because the computer cannot control exhaust backpressure correctly, engine warm-up and emissions control can be affected.
Symptoms
- Check engine light is on
- Rough or unstable idle
- Hard starting in cold weather
- Reduced fuel economy or sluggish performance
Common causes
- most common: Valve sticking from carbon buildup
- common: Weak or failing valve actuator
- common: Vacuum leak or damaged control line
- less common: Clogged exhaust pressure passage
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Clean the valve and check it moves freely | Yes | $50–150 |
| Replace the valve or actuator | Yes | $150–400 |
| Repair vacuum lines or wiring to the valve | Mechanic | $50–200 |
Frequently asked questions
Can I drive with a P0476 code?
Yes, but the engine may idle rough and be harder to start in cold weather. Get the valve checked before winter.
What is the difference between P0475 and P0476?
P0475 means the valve circuit has an electrical fault. P0476 means the valve is there but not performing in the right range.
How much does it cost to fix a P0476?
Cleaning the valve costs about $50–$150. Replacing it typically runs $150–$400.
Related codes
P0475
P0475 Code: Exhaust Pressure Control Valve A Malfunction
P0477P0477 Code: Exhaust Pressure Control Valve A Low
P0478P0478 Code: Exhaust Pressure Control Valve A High
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.