P2506 OBD-II Trouble Code: ECM/PCM Power Input Signal Range/Performance

P2506 code definition

ECM/PCM Power Input Signal Range/Performance

What the P2506 code means

P2506 is an OBD-II generic code for the Engine Control Module (ECM) detecting if the power input signal is not within range or when its performance is not as specified.

What causes the P2506 code?

• The ECM/PCM monitors the power input of the car to be within a specified range and performance level. If the input voltage does not stay within specifications, the code is set and the Check Engine Light is illuminated.

• The vehicle battery supplies power to the ECM/PCM and if the voltage was below or drops below the specified minimum, then it causes the ECM /PCM to set the code.

What are the symptoms of the P2506 code?

• The battery is too low to crank the vehicle properly.
• The battery may be overcharged and voltage is above the specified range.
• The battery may keep getting drained overnight.

How does a mechanic diagnose the P2506 code?

• Scan codes and document the codes in the ECM/PCM.
• Check the battery voltage level and load test the battery.
• Start the engine and check if the charging system is within specifications.
• Check if the voltage to the ECM/PCM is correct and stays within specifications.
• Check the battery and electrical system for a draw of power from the battery.

Common mistakes when diagnosing the P2506 code?

• Replacing the ECM/PCM when the battery is being drained of power overnight.
• Failing to clear the ECM/PCM codes after the codes are fixed.
• Replacing parts when the connection is loose or corroded to the battery.

How serious is the P2506 code?

Code P2506 is a code that the electrical power to the ECM/PCM is either too low or too high. These conditions can lead to failed batteries or a overcharged charging system, which could ruin electrical components or batteries causing them to fail.

What repairs can fix the P2506 code?

• Replacing the batteries and cleaning connections.
• Replacing the alternator for over or under charging the batteries.
• Repairing a component that is drawing battery power after the vehicle is shut down.

Additional comments for consideration regarding the P2506 code

Code P2506 is not a very common code and are used mostly by diesel vehicles. The battery being low on voltage supply to the ECM/PCM is the common cause for the code.

Need help with a P2506 code?

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