P2509
ECM/PCM Power Input Signal Intermittent
P2509 is an OBD-II diagnostic trouble code meaning: ECM/PCM Power Input Signal Intermittent. Common causes: poor contact in the ecu power connectors, broken or damaged wires in the power circuit. Estimated repair cost: $6–33.
Symptoms
- The engine stalls or runs erratically
- Check Engine light comes on
- Problems starting the engine
- Loss of engine power
Causes
- Poor contact in the ECU power connectors
- Broken or damaged wires in the power circuit
- Faulty ECU power relay
- Corrosion of contacts in the power supply circuit
- Battery or alternator problems
How to Fix
- Check the ECU power connections and connectors
- Inspect the wiring harness for damage
- Check the ECU power relay
- Check battery and generator voltage
- Clean the contacts in the power circuit
Related codes
Error P2509 by Vehicle Brand
FAQ
What does the P2509 code mean?
P2509 is an OBD-II diagnostic trouble code that indicates: ECM/PCM Power Input Signal Intermittent
What causes a P2509 error code?
The most common causes of P2509 include: Poor contact in the ECU power connectors; Broken or damaged wires in the power circuit; Faulty ECU power relay; Corrosion of contacts in the power supply circuit.
How do I fix a P2509 diagnostic trouble code?
To fix P2509: Check the ECU power connections and connectors. Inspect the wiring harness for damage. Check the ECU power relay. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P2509?
Do not drive — repair immediately
How much does it cost to fix P2509?
The estimated repair cost for P2509 is $6–33. Actual cost depends on your vehicle, location, and labor rates.
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