P2509

ECM/PCM Power Input Signal Intermittent

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$6–33 (est.)

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

P2508 P2510 P2507