P0475
Exhaust Pressure Control Valve A
Exhaust / emissions
Generic OBD-II
Medium
What it means
P0475 indicates a fault with the "A" exhaust pressure control valve — the valve (common on diesels) that regulates exhaust backpressure to help the engine warm up, brake, or run its emissions equipment. A stuck or electrically faulty valve typically shows up as reduced power, poor fuel economy, or slow warm-up rather than a no-start.
Medium
Can I keep driving? Usually drivable — you may notice reduced power, poor economy, or a slow warm-up, but the fault won't normally leave you stranded.
Common symptoms
What you'll notice
- Check-engine light on
- Reduced engine power or sluggish acceleration
- Poor fuel economy
- Slow warm-up in cold weather (on diesels)
- Excessive exhaust smoke in some cases
Common causes
Most likely first
- Faulty exhaust pressure control valve or actuatorLikely
- Carbon buildup causing the valve to bind or stickCommon
- Damaged, corroded, or shorted wiring or connector at the valveCommon
- Failed valve control solenoidLess often
- ECM fault (rare)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and inspect the exhaust pressure control valve and its linkage for carbon binding or seizure.
- Check the valve's wiring and connector for damage, corrosion, or a poor connection.
- Command the valve with a scan tool (where supported) and confirm it moves through its range.
- Replace the valve or actuator if it won't move freely, then clear and re-test.
FAQ
Quick answers
Is it safe to drive with P0475?+
Short trips are generally fine, but reduced power and a valve stuck in the wrong position can hurt economy and, on diesels, DPF regeneration. Repair it before long hauls.
Can I just clear P0475?+
If the valve is sticking or the wiring is faulty, the code comes back. Fix the mechanical or electrical cause first.
Related codes
Often seen with P0475
Read & clear P0475 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