Faulty exhaust pressure control valve solenoid or actuator; Damaged or corroded wiring harness or connector at the valve; Open or short circuit in the valve control circuit; Failed exhaust pressure sensor providing incorrect feedback; Sticking or mechanically binding valve mechanism; Corroded or loose ground connection for the valve circuit; Powertrain control module internal fault (rare)

DTC codes / P04xx · Auxiliary emission controls / P0475

P0475Exhaust Pressure Control Valve

Q: What does code P0475 mean?

Exhaust Pressure Control Valve. P0475 indicates that the powertrain control module has detected a fault in the exhaust pressure control valve circuit, typically an electrical open, short, or out-of-range signal. The computer monitors the valve's control circuit and flags this code when the commanded state does not match the feedback signal or when the circuit resistance falls outside the expected range.

P0475 indicates that the powertrain control module has detected a fault in the exhaust pressure control valve circuit, typically an electrical open, short, or out-of-range signal. The computer monitors the valve's control circuit and flags this code when the commanded state does not match the feedback signal or when the circuit resistance falls outside the expected range.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaAuxiliary emission controls

Symptoms you may notice

Illumination of the check engine light, often with no other noticeable symptoms
Reduced engine performance or power, especially under load
Poor fuel economy due to incorrect exhaust pressure regulation
Rough idle or hesitation during acceleration
Increased exhaust noise or unusual sounds from the exhaust system
In some cases, the vehicle may enter limp mode to protect the engine

Common causes, most likely first

Faulty exhaust pressure control valve solenoid or actuator
Damaged or corroded wiring harness or connector at the valve
Open or short circuit in the valve control circuit
Failed exhaust pressure sensor providing incorrect feedback
Sticking or mechanically binding valve mechanism
Corroded or loose ground connection for the valve circuit
Powertrain control module internal fault (rare)

How to diagnose and fix it

Perform a visual inspection of the valve, connector, and wiring for damage or corrosion
Check the valve's electrical connector for proper seating and clean any corrosion
Measure the resistance of the valve solenoid and compare to manufacturer specifications
Test the control circuit for continuity, shorts to ground, and shorts to power
Verify the exhaust pressure sensor signal with a scan tool and compare to expected values
Command the valve with a scan tool to verify mechanical operation and listen for actuation
If all electrical checks pass, replace the exhaust pressure control valve and clear the code

Don't overlook the exhaust pressure sensor

A faulty exhaust pressure sensor can set P0475 even when the control valve itself is functioning correctly, because the PCM relies on sensor feedback to validate valve operation.
Corrosion inside the valve connector is a frequent cause that is easily missed during a quick visual inspection, so always disassemble and inspect the terminals closely.
The valve may be mechanically stuck due to carbon buildup, which can mimic an electrical failure and lead to unnecessary replacement of the solenoid.
On some vehicles, P0475 is stored as a pending code without illuminating the check engine light until a second consecutive fault occurs, so a single occurrence may not indicate a hard failure.
Always check for related codes such as P0470 or P0471, as they can provide additional context about whether the issue is electrical or mechanical.

Can I keep driving with P0475?

You can generally drive with P0475, but avoid heavy acceleration or towing until the fault is repaired, as incorrect exhaust pressure regulation can lead to reduced performance and potential damage to the exhaust system over time.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.