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SPN 2949moderate severity✨ AI-generated

EGR Valve Position Out of Range

The EGR valve position is not where it's supposed to be based on sensor readings.

Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.

What it means (plain English)

The engine control module (ECM) expects the EGR valve to be in a certain position based on how much exhaust gas should be recirculated; when it reads a different position, it triggers this code.

What the computer is actually seeing

The ECM monitors the EGR valve position through a sensor. Normally, if the EGR valve is commanded to open at 50%, the sensor should read around 50% as well. If the readings don’t match or exceed the expected range, the code is set.

What a healthy reading looks like

EGR valve position should match commanded position within 5%.

Guided diagnostic — the DiagCoach way

Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.

  1. 11. Check for visible damage to wiring and connectors related to EGR valve. Correct any issues found. Decision: Is the wiring intact? Yes: Proceed to step 2. No: Repair wiring/connectors and retest.
  2. 22. Verify the EGR valve operation by commanding it to open using a scan tool. Measure the actual position with another tool. Decision: Is the EGR valve responding correctly to commands? Yes: Proceed to step 3. No: Replace the EGR valve.
  3. 33. Test the EGR position sensor with a multimeter. Expect between 0.5V (closed) to 4.5V (fully open) depending on the valve position. Decision: Does the sensor output the correct voltage? Yes: Proceed to step 4. No: Replace the EGR position sensor.
  4. 44. Inspect the vacuum lines for any leaks if applicable, and check for any blockages in the EGR system. Decision: Are there any leaks or blockages? Yes: Repair as necessary. No: Check and possibly replace the ECM.

Common causes

  • Faulty EGR valve
  • EGR valve position sensor failure
  • Wiring issues or connector problems
  • Vacuum leaks affecting EGR operation
  • ECM malfunction

Typical repair cost

$$$

Related codes

Frequently asked questions

Is it safe to drive with this code?

It’s not ideal since it can affect emissions and engine performance; fix it soon.

Will the code come back?

Yes, if the underlying issue isn't addressed, it will likely return.

Why does this code pair with EGR Performance codes?

If the EGR valve is malfunctioning, it can affect the overall performance of the EGR system, leading to multiple codes.

Working a real vehicle right now?

Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.

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