P2506 Fault Code

ECM/PCM Power Input Signal Range/Performance

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

The P2506 code is triggered when the Engine Control Module (ECM) or Powertrain Control Module (PCM) detects that the power input signal is outside the expected range. This can occur due to various electrical issues within the vehicle's power system. The proper functioning of the power input signal is crucial for the overall performance of the vehicle, as it regulates the voltage levels required by the ECM/PCM.

What are the symptoms of the P2506 code?

Common symptoms associated with the P2506 code may include:

• Engine stalling or failing to start
• Warning lights on the dashboard, such as the check engine light
• Decreased engine performance or hesitation during acceleration
• Inconsistent or fluctuating electrical system performance

What causes the P2506 code?

Several factors may lead to this fault code, including:

• Weak or failing battery
• Poor electrical connections or corroded wiring
• Faulty ECM/PCM
• Issues with the alternator or voltage regulator
• Blown fuses related to the power input circuit

How to fix P2506?

To resolve the P2506 code, consider these steps:

• Inspect the vehicle's battery for any signs of weakness or damage, and replace it if necessary.
• Check all connections associated with the ECM/PCM for corrosion or loose wires, and repair as needed.
• Test the alternator and voltage regulator to ensure they are functioning correctly and replacing any faulty components.
• Clear the fault code using a scan tool and perform a test drive to see if the code returns; further diagnostics may be necessary if it does.