P2505 Fault Code

ECM/PCM Power Input Signal

• What does that mean?
• Symptoms
• Causes
• Solutions

The P2505 fault code indicates an issue with the ECM/PCM power input signal, which is essential for the engine control module (ECM) or powertrain control module (PCM) to operate correctly. When the power input to the ECM/PCM is unstable or interrupted, this code is triggered, potentially leading to poor engine performance or failure to start.

What are the symptoms of the P2505 code?

Common symptoms of a P2505 fault code may include:

• Engine may fail to start, leading to issues with ignition.
• Engine stalling while driving due to interruptions in power supply.
• Illumination of the check engine light on the dashboard.
• Unusual engine behavior including erratic idling or misfires.

What causes the P2505 code?

This fault can be caused by several factors, including:

• Corroded or damaged wiring or connectors related to the ECM/PCM.
• Faulty ECM/PCM itself that fails to receive or process power signals.
• Bad ground connections that affect the power supply to the ECM/PCM.
• Faulty ignition switch that fails to provide power to the ECM/PCM during engine operation.

How to fix P2505?

To resolve the P2505 fault code, the following steps are generally recommended:

• Inspect wiring and connectors for signs of damage, corrosion, or loose connections.
• Test and, if necessary, replace the ECM/PCM to ensure it functions correctly.
• Verify ground connections and repair any faulty grounds.
• If applicable, check the ignition switch for proper operation and replace if it's faulty.