P2511 moderate

ECM/PCM Power Relay Sense Circuit Intermittent

The P2511 code means the vehicle's onboard diagnostic system has detected: ECM/PCM Power Relay Sense Circuit Intermittent. This is a moderate severity code.

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Keep driving?
Short distances only
DIY difficulty
moderate
Estimated cost
$50 - $350 (parts and labor)
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Common Symptoms

  • Intermittent stalling after cold start
  • Check engine light flickers
  • ECM resets during driving
  • Battery voltage fluctuations on scan tool

Probable Causes (Ranked by Likelihood)

  • Worn ECM power relay contacts Very High
  • Intermittent connection at relay socket High
  • Sense wire with damaged insulation Moderate
  • Corrosion in fuse box relay cavity Low

Step-by-Step Diagnostic Procedure

  1. Load test ECM power relay while monitoring sense circuit

  2. Tap test on relay while engine is running

  3. Inspect relay socket pins for looseness or discoloration

  4. Check sense wire routing for abrasion points

Frequently Asked Questions

What is the difference between P2510 and P2511?

P2510 indicates a consistent range or performance issue while P2511 indicates the problem comes and goes, suggesting a loose connection or worn component.

Can a failing relay work sometimes?

Yes. Relay contacts can become pitted or corroded, causing intermittent high resistance that only disrupts the circuit under certain temperatures or vibration.

Is it expensive to fix P2511?

Usually not. The relay itself is typically $20 to $60, and labor is minimal since relays are usually easy to access in the fuse box.

Sources

This page is built from documented references. Verify against your own service info before repair work.

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