P0476
Exhaust Pressure Control Valve A Range/Performance
Exhaust / emissions
Generic OBD-II
Medium
What it means
P0476 means the exhaust pressure (back-pressure) control valve isn't moving to the position the ECM commands. This valve regulates exhaust flow — on many diesels it helps the engine warm up and supports particulate-filter regeneration. Soot buildup or a worn actuator is the usual cause, and you may notice reduced power or an odd exhaust note.
Medium
Can I keep driving? Usually drivable, but you may notice reduced power or a change in exhaust note — get it checked, especially on diesels where the valve aids warm-up and regeneration.
Common symptoms
What you'll notice
- Check-engine light on
- Reduced engine power or performance
- Abnormal exhaust noise
- Slightly reduced fuel economy
Common causes
Most likely first
- Exhaust pressure control valve sticking (soot/carbon buildup)Likely
- Failed or worn valve actuatorCommon
- Wiring or connector fault in the valve control circuitCommon
- Restricted or damaged linkageLess often
- ECM/PCM fault (rare)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and confirm the code with a scan tool.
- Command the exhaust pressure control valve and watch that it moves through its range.
- Inspect the valve for soot buildup or sticking and clean if serviceable.
- Check the actuator wiring and connector for damage or corrosion.
- If the valve won't respond correctly, replace it. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P0476?+
Usually yes for short trips, but a valve stuck out of range can cost power and, on diesels, affect emissions regeneration. Repair it soon.
Can I just clear P0476?+
It returns until the valve moves correctly again. Cleaning soot or replacing the valve is the real fix.
Related codes
Often seen with P0476
Read & clear P0476 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX