P0476Generic code

P0476 Code: Exhaust Pressure Control Valve Range/Performance

The P0476 code indicates that the exhaust pressure control valve responds electrically, but the result is not what the computer expects. Expect a loss of power, slow warm-up when cold and high exhaust temperature. A valve seized with soot is the most frequent cause.

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 P0476 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 P0476 code indicates that the component responds electrically, but the result is not what is expected. 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.

This kind of fault is usually not solved with a multimeter, because electrically everything looks fine. You have to compare what the part says against reality: with a gauge, a thermometer, a vacuum pump, or by commanding the component with the scan tool and watching whether the physical result matches the command.

P0476 code symptoms

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

Likely causes of the P0476 code

  1. Valve seized with soot. The most frequent cause.
  2. Defective actuator that does not move the valve with the force it needs.
  3. Exhaust pressure sensor with a clogged port, which gives a wrong reading of the back pressure.

How to diagnose the P0476 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 P0476 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.

P0476 on Ford

Typical of the Ford Power Stroke 6.0 and 6.4.

P0476 on International

Typical of International engines.

Frequently asked questions about P0476

Can I drive with a P0476 code?
With caution, and keep an eye on engine temperature and power. A P0476 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 P0476?
Roughly $80 to $900, depending on whether it is wiring, the actuator or the valve itself.
What does the P0476 code mean?
It is a generic OBD2 code that means the exhaust pressure control valve responds electrically but the physical result is not what the computer expects.
What is the most common cause of P0476?
A valve seized with soot. A weak actuator, or an exhaust pressure sensor with a clogged port, can also set it.

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