P2507 OBD-II Trouble Code: System Too Rich (Bank 1)

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Cost of diagnosing the P2507 code

P2507 is a diagnostic trouble code (DTC) for "System Too Rich (Bank 1)". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

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P2507 code definition

ECM/PCM Power Input Signal Low

What the P2507 code means

P2507 is an OBD-II generic code for the engine control module (ECM) detecting the power input to the ECM is below the required voltage for the 5 volt internal ECM reference signal voltage to the sensors.

What causes the P2507 code?

  • The engine control module (ECM) is detecting that the internal ECM reference voltage of 5 volts has gone below the 5 volts for a specified amount of time.

  • A key on condition with the main engine battery falling below 5 volts can generate the fault code.

  • The ECM may have an internal failure of the reference 5 volts generator.

What are the symptoms of the P2507 code?

  • The Check Engine Light will be illuminated and the code is set in ECM memory as a fault.

  • The vehicle may not start if the main battery is below 5 volts.

  • The OBD-II scanner port may not be able to access the ECM if the main battery is too low.

  • The ECM may have failed internally and cannot produce a signal reference 5 volts.

How does a mechanic diagnose the P2507 code?

  • Scans for codes and documents the code in the ECM then looks at the freeze frame data for failure

  • Checks the main battery to make sure it has a full charge

  • Checks battery connection to properly power the vehicle

  • Scans the ECM and looks at the reference voltage to all the sensors to see if it is at 5 volts. If it is, then they will clear the codes and see if the code returns

  • Checks the ECM connector and wiring for corrosion causing a low ECM battery input voltage

Common mistakes when diagnosing the P2507 code?

  • Clearing ECM memory codes before checking the freeze frame data for the main failure problem, so the failure may be duplicated and repaired.

  • Failing to clear the ECM codes after the codes are fixed.

  • Replacing the ECM for the code P2507 when the code cannot be verified. The code may have been from a main battery falling below the 5 volts.

How serious is the P2507 code?

Code P2507 is an indication that the ECM cannot or has not been able to produce the 5 volt reference voltage needed for all the computer sensors. A failed ECM will result in a no start condition.

What repairs can fix the P2507 code?

  • Replacing the engine main battery that has failed
  • Clearing the codes and verifying the ECM can produce the 5 volt reference signal voltages
  • Repairing the wiring harness to the battery or ECM for power supply to the ECM
  • Replacing an ECM with a failure internally of the reference voltage generator

Additional comments for consideration regarding the P2507 code

Code P2507 is for the ECM not being able to produce a 5 volt reference signal to all the sensors. The most common causes to this is the main vehicle battery running below 5 volts and the ignition key is in the “On” position. The ECM would not be able to maintain the 5 volt reference when the battery fell below 5 volts.

Need help with a P2507 code?

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P2507

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