- Low battery voltage
- Faulty Powertrain Control Module (PCM)/Engine Control Module (ECM)
- ECM/PCM harness is open or shorted
- ECM/PCM circuit poor electrical connection
- Engine Light ON (or Service Engine Soon Warning Light)
P2505 Jeep DescriptionWhen the ignition switch is turned "ON", the battery voltage is applied from the battery to the Powertrain Control Module (PCM)/Engine Control Module (ECM) through the main relay. In case that the ignition switch is turned "OFF", the ECM/PCM is supplied with power through the battery power input line to control the basic operation of the vehicle. The ECM/PCM set the OBDII code when the ECM/PCM Power Input is out of factory specifications.
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