P2505 Possible Causes
- Low battery voltage
- Faulty Powertrain Control Module (PCM) / Engine Control Module (ECM)
- ECM/PCM harness is open or shorted
- Poor electrical connection in ECM/PCM circuit
How to Fix Code P2505
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
Possible Symptoms
Illuminated engine light (or service engine soon warning light)
P2505 Meaning
When the ignition switch is turned to “ON”, battery voltage is applied from the battery to the Powertrain Control Module (PCM)/Engine Control Module (ECM) through the main relay. When the ignition switch is in “OFF” position, the ECM/PCM is powered by the battery power supply input line to control basic vehicle operation. The ECM/PCM sets the OBDII code when the ECM/PCM power supply input is outside factory specifications.