P06A5 OBD Error Code: Problem & Solutions

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In this OBD error, the PCM module or Powertrain control module sets the code P06A5. This is set after it sends a reference signal of 5 volts to all the applicable engine sensors in the vehicle, and in correspondence detects an issue with this signal.

In simple terms, the Engine control module or ECM module checks the engine sensors by sending out a 5-volt reference signal. If it detects any issue with this signal, it sets the error code P06A5.

What causes this problem with the Sensor Reference Voltage "D" Circuit High?

• Any Open circuits and/or connectors
• Defectiveness found in the blown fuses and/or fusible links
• Malfunction in the system power relay
• Sensor is poor

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If you are facing OBD error code P06A5, then there are significant common symptoms that can be felt or observed. We have worked out a list here to help you out in understanding this problem better.

Common Symptoms

• Transmission fails to shift between sport and economy mode
• Other transmission shifting issues
• Absence of, or delay in transmission engagement
• Transmission is unable to switch between all-wheel and two-wheel drive modes.
• Transfer case is unable to shift from low gear to high gear
• Poor front differential engagement
• Poor front hub engagement
• Speedometer/odometer is erratic or unable to operate as normal

We have listed out some ways which would help you to correct the occurrence of OBD Code P06A5. They are mentioned here as follows:

• Repair or replace any blown fuses
• Repair or replace ECM
• Repair or replace switch circuit

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If you want to easily diagnose this fault code, then all you have to do is to follow the instructions mentioned below:

Start off with consulting your vehicle information source, match your specific vehicle model number and other features to the ones in the manual. This manual will hold as a guide and reference during the procedure of diagnosing this OBD error code P06A5.

Now move forward to perform a visual inspection of the related sensor system, the wiring harnesses as well as the connectors. You can proceed to repairing or replacing any damaged connectors, wirings or components you can find.

You can now move on to connecting the scanner to the diagnostic port of your vehicle and retrieve all the codes present, freeze frame data and also make a note of them. Ensure you note them all in the order they have occurred, these codes will help you in the future to figure out if the error is intermittent. Once you have cleared the codes, take your vehicle on a test drive and observe if the code resets immediately.

If you observe that the code resets immediately, then get hold of a DVOM and test the reference voltage and the ground signals of the sensor. Continue to test the sensor resistance and continuity levels if you notice that the voltage and the ground signals both are present at the sensor connector. Refer your vehicle to be able to compare your findings, and those provided by the manufacturer. Those sensors that aren’t in congruence will need to be replaced. Remember to disconnect all related controllers prior to testing resistance with the DVOM, this is to avoid PCM damage. After running the test, you note that the reference voltage is high at the sensor, then use the same DVOM for checking circuit resistance and continuity (between sensor and PCM). As per need repair or replace the shorted or open circuits.

Common Mistakes When Diagnosing the P06A5 Code

• Failure of the engine sensor
• Powertrain Control Module (PCM) has completely failed
• Wiring issue present in multiple places