P0475Generic code

P0475 Code: Exhaust Pressure Control Valve Malfunction

The P0475 code indicates an electrical fault in the control circuit of the exhaust pressure control valve. Expect a loss of power, slow warm-up when cold and high exhaust temperature. Check the fuse, relay, connector and wiring before replacing the valve.

Severity
Medium
Can I keep driving?
Yes, but with caution
Estimated cost
$80 to $900
Difficulty
Medium
System
Emissions Control
Applies to
All OBD2 vehicles

Updated Reviewed by Renzo Chacca

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What the P0475 code means

On some diesels (Ford Power Stroke, International) a valve in the exhaust partly closes when the engine is cold to raise the engine load and warm it up sooner. It also helps the cabin heater.

The computer monitors the control circuit from its own driver transistor. The P0475 code indicates an electrical fault in the control circuit. Before replacing the component, check the fuse, relay, connector and wiring, since they are the most common cause.

If the valve sticks closed, the engine loses a lot of power and runs hot. If it sticks open, the engine is slow to warm up. It often seizes up with soot and rust.

Always start with the simplest things: fuse, relay and connector. Then check power, ground and signal with the part still connected (using back-probes), and finally the continuity of each wire to the computer. Only if all of that checks out should you replace the component.

P0475 code symptoms

  • Check engine light on.
  • Loss of power.
  • Slow warm-up when cold.
  • High exhaust temperature.

Likely causes of the P0475 code

  1. Damaged connector, whether loose, broken or corroded.
  2. Fuse or relay blown or with worn contacts.
  3. Cut or shorted wiring between the component and the computer.
  4. Failed component: a damaged coil, motor or internal electronics.

How to diagnose the P0475 code step by step

  1. Command the component with the scan tool and check whether it responds.
  2. Check the fuse and relay.
  3. Measure the supply at the connector: battery voltage with the key on or when it is commanded.
  4. Measure the component resistance and compare it with the manual. Also check the insulation to ground.
  5. Check the control wire for continuity and for shorts.
  6. Command the valve with the scan tool and watch the exhaust pressure.
  7. Inspect the exhaust pressure sensor tube.

How to fix the P0475 code

  • Repair the connector, the wiring or the power supply.
  • Replace the exhaust pressure control valve if it does not respond with correct power and control.
  • Clear the codes and verify that the monitor completes.

Technical reference data

  • Electric or vacuum actuator controlled by PWM.
  • Approximate values only: check the manufacturer data for your engine.

Brand-specific notes

This valve is found on some turbo diesels, and soot is hard on it.

P0475 on Ford

Typical of the Ford Power Stroke 6.0 and 6.4.

P0475 on International

Typical of International engines.

Frequently asked questions about P0475

Can I drive with a P0475 code?
With caution, and keep an eye on engine temperature and power. A P0475 code can leave the valve stuck closed, and that makes the engine run hot.
What does the exhaust pressure control valve do?
On some diesels (Ford Power Stroke, International) a valve in the exhaust partly closes when cold to raise the engine load and warm it up sooner. It also helps the cabin heater.
Do I always have to replace the part?
No. Check the fuses, relays, connectors and wiring first.
How much does it cost to fix P0475?
Roughly $80 to $900, depending on whether it is wiring or the valve itself.
What does the P0475 code mean?
It is a generic OBD2 code for an electrical fault in the control circuit of the exhaust pressure control valve.
What is the most common cause of P0475?
A damaged connector, a blown fuse or relay, or wiring cut or shorted on the way to the computer. Check those before you buy the valve.

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Questions about the P0475 code

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