P0475

Exhaust Pressure Control Valve

Severity: Medium
Driving: Drivable — book it in

A fault with the exhaust pressure control valve. This valve deliberately restricts the exhaust to raise back pressure, which warms the engine faster from cold and helps the particulate filter reach the temperature it needs to regenerate.

Possible causes

CommonCarbon or soot seizing the valve mechanism
CommonFailed control solenoid or actuator
CommonSplit, perished or disconnected vacuum hose
CommonCorroded connector or damaged wiring
PossibleBlown fuse on the circuit
RareFailed control module driver

What you might notice

Reduced power or limp mode
Slow to warm up in cold weather
Poor cabin heating
Excessive smoke
Particulate filter regeneration problems
Check engine light on

What to check, in order

Check the vacuum hoses first on a vacuum-operated system.
Check the valve mechanism moves freely - soot seizing it is common on a diesel used mainly for short journeys.
Measure the solenoid winding resistance against specification.
Inspect the connector for corrosion and heat damage.
Read all codes - particulate filter codes alongside this one matter more.

Read this code from your own car

Plug an ELM327 adapter into the OBD-II port under the dashboard. Pin16 reads every stored, pending and permanent code, explains each one like this page does — offline, with no account — and shows what the car recorded when the fault was set.

Get Pin16 on Google Play

Where this code sits

B · Body C · Chassis P · Powertrain U · Network and communication

Auxiliary emission controls