Guide To P06A6 OBD Error Code Solutions

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The Engine control module or ECM of a vehicle managed several modules and systems of the vehicle. It possesses 5-volt reference buses called the ‘5-volt reference’. Each of the reference busses provided 5-volt reference circuit for more than one sensor, and so if a fault arrives in any one of the 5-volt reference circuit, it will affect all the other 5-volt reference circuits connected to the bus. It is the responsibility of the PCM module to monitor the voltage on this reference buses. Any malfunction, results in the P06A6 code being set by the ECM module.

The powertrain control module or PCM, sets the code P06A6, when it detects an issue with the 5-volt reference signal it sent out to all the applicable engine sensors.

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

• Malfunctioning Engine Control Module (ECM)
• The harness of the ECM is open or shorted
• ECM circuit shows extremely poor electrical connection
• Noticeable shorted sensor on 5V circuit

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It is essential to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P06A6 here:

Common Symptoms

• Transmission is unable to shift between sport and economy modes
• Malfunctions with the transmission shifting
• Transmission engagement is absent or delayed
• Transmission fails to switch between all-wheel and two-wheel drive modes
• Transfer case unable to to shift from low to high gear
• Deficit in the front differential engagement
• Poor front hub engagement
• speedometer/odometer behaving erratic or becomes inoperative

Here are some ways with the help of which you will be able to correct the OBD Code P06A6

• Repair or replace voltage circuits
• Repair or replace ECM
• Repair or replace engine sensor 

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Here are some steps which you should follow in order to diagnose this fault code:

• Start off by getting your vehicle information source. This will serve as a very heavy reference point throughout the diagnostic procedure. Ensure you are able to find the one that’s exactly for your vehicle and model number etc. Now, using it as your guide locate and visually inspect the sensor system, related wiring harness and also connectors. See if any of them require repairing, or replacements. Proceed to resolving that and then connect the scanner to your vehicle's diagnostic port. Retrieve all of the codes present, freeze frame the data and also make note of them in order. Noting them down will help in figuring out if they codes are intermittent. You can safely clear all codes and go on a test-drive. Observe if the code is immediately reset or not.
• If you find that the code immediately resets, then with the help of a DVOM test the reference voltage and ground signals of the sensor. Typically, you should find 5 volts and a ground at the sensor connector itself.
• Don’t stop here, continue testing the sensor resistance and the continuity levels if you find that the voltage and ground signals are both present at the sensor connector. All the specifications for the testing will be available in your vehicle information source. Compare the finds that see if there are any discrepancies, those sensors who are failing to comply as per manufacturers will have to be replaced.
• Now disconnect all the controllers related from the circuits of the system before testing resistance with the DVOM. This is done to avoid damage of the PCM. Use the DVOM for checking circuit resistance and continuity (between the sensor and PCM) if the reference voltage is low at the sensor. All open and shorted circuits will then have to be replaced or repaired depending on the damage. If you observe that the sensor in question is showing electromagnetic properties with a reciprocating signal, you will need an oscilloscope to monitor the live data. The focus should be glitches and completely open circuits.

Common Mistakes When Diagnosing the P06A6 Code

• Failure of the engine sensor
• The Powertrain Control Module (PCM) fails
• Multiple issues with wiring