P2509 – ECM/PCM Power Input Signal Intermittent

Description

The ECM detects an intermittent loss of power or ground reference.

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Symptoms

Stalling
No start
Intermittent misfires
Electrical issues

Causes

Loose battery connections
Faulty ECM relay
Wiring issues
Ground faults

Diagnosis

Inspect battery terminals
Check ECM relay
Inspect grounds
Test wiring continuity

Repair

Tighten battery connections
Replace relay
Repair wiring
Fix ground faults