P2610 low

ECM/PCM Internal Engine Off Timer Performance

The P2610 code means the vehicle's onboard diagnostic system has detected: ECM/PCM Internal Engine Off Timer Performance. This is a low severity code.

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Keep driving?
Yes, but fix soon
DIY difficulty
hard
Estimated cost
$100 - $1000 (parts and labor)
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Common Symptoms

  • Check engine light on
  • No noticeable drivability symptoms
  • Possible incorrect cold start fuel calibration
  • Slightly rough start after long soak

Probable Causes (Ranked by Likelihood)

  • ECM internal timer circuit degradation Very High
  • Battery disconnection causing timer reset High
  • ECM software error Moderate
  • Keep-alive power circuit issue to ECM Low

Step-by-Step Diagnostic Procedure

  1. Check ECM keep-alive memory voltage

  2. Verify battery connections are secure

  3. Check for ECM software updates or TSBs

  4. Monitor engine-off timer value vs actual soak time

Frequently Asked Questions

What is the engine off timer?

The ECM tracks how long the engine has been off to calculate proper fuel enrichment and air heater duration for the next cold start. P2610 means this timer is not accurate.

Can a battery disconnect cause P2610?

Yes. If battery power is lost, the ECM loses its engine-off timer. Some vehicles set P2610 after a battery replacement or disconnection.

Does P2610 affect how my engine runs?

Minimally. The main effect is on cold start fuel calibration, which may cause slightly rough starts. The engine runs normally once warm.

Sources

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

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