What this code means

The ECM internal timer that tracks engine-off time is malfunctioning.

Symptoms

• Check engine light
• Incorrect cold-start enrichment
• Extended crank time

Common causes

• ECM internal fault
• Keep-alive memory power loss
• Battery disconnected frequently

Diagnostic steps

1. Check ECM keep-alive power circuit
2. Verify battery connections
3. Check for parasitic drain

Repair notes

Ensure battery and keep-alive circuits are intact. ECM replacement if internal timer failure confirmed.

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