P06A7 - OBD Trouble Code

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The OBD error P06A7 is mostly accompanied by a more specific sensor code. The P06A7 signifies that the sensor reference circuit voltage is either out of range or not performing as expected. If this code is stores alone; chances are that a programming error has come up in the PCM module. For the diagnosis on this error code, repairing all other sensor codes is mandatory.

A 5-volt reference signal is sent out by the Engine control module or PCM to all the applicable engine sensors. If an issue is detected with the signal the PCM will set error code P06A7.

What causes this problem with the Sensor Reference Voltage "B" Circuit Range/Performance?

• Poor sensor
• Defect or blown fuses or fusible links
• System power relay is malfunctioning
• Any circuits and/or connectors that are open or shorted

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It is vital 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 P06A7 here:

Common Symptoms

• The vehicle transmission is unable to shift between sport and economy modes
• Malfunctions in the shifting of transmission
• Delay in or no transmission engagement found
• Transmission unable to switch between all-wheel and two-wheel drive modes
• Transfer case fails to shift from low to high gear
• Poor front differential engagement
• Lacking in the front hub engagement
• Inoperative or abnormally functioning speedometer/odometer

Want to correct the Trouble Code P06A7? Read these points mentioned below:

• Repair or replace shortened sensors
• Repair or replace the ECM

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It is essential to diagnose this fault code. Here are some steps which a mechanic should follow for diagnosing the problem that triggered a P06A7 code to be stored:

Consult your vehicles specific information source to locate and understand the function of the sensor in question. You can now perform a visual inspection of this sensor system and check for any damages to the related wiring harnesses and connectors too. All of these will have to be repaired or replaced as per the extent of damage. Once that is out of the way, you continue diagnosis by retrieving all the stores error codes and freeze framing them. Do this simply by connecting the scanner to your vehicle's diagnostic port. Make a note of these codes in the order in which they have occurred for future reference. Clear the codes now, and take your car on a test-drive and see if the code is immediately reset to not.

If the code resets immediately, get hold of a DVOM and test the reference voltage and ground signals of the sensor, tally them with the correct ones mentioned in your manual. Typically you should expect 5 volts and a ground at the sensor connector. The voltage and ground signals may be still present at the sensor connector, you will have to then continue testing sensor resistance and continuity levels. The specifics for these are subject to vehicle models, so you will again have to refer the information source. All sensors that aren’t complying with the specifications mentioned in your manual will have to be replaced.

Common Mistakes When Diagnosing the P06A7 Code

• Engine sensor has failed
• Powertrain Control Module (PCM) has failed
• Wiring issue is seen