P06A3 - OBD Trouble Code

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The OBD code ‘Engine may not start’ is defined by Sensor Reference Voltage "D" Circuit/Open. What this simply means is that the Engine control module ECM/PCM sends out a 5-volt reference signal to all the applicable engine sensors, upon detection of an issue with this signal, the PCM by default sets code P06A3.

The Powertrain control module is responsible for the functioning of the whole vehicle, it manages the running of many modules of the automobile. If it notices an issue with the 5-volt reference signal it sends to all engine sensors it’s applicable for, then it has to set code P06A3

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

• Circuits and/or connectors are found to be open
• Defectiveness or blown fuses and/or fusible links
• Malfunctioning system power relay
• Poor sensor

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2. Engine Sensors - These should be working well, repair if possible or just replace easily with us.
3. Fuses - Will require replacement, opt for superior quality car parts with us, order online today!
4. Switch Circuit - May need a new one, don’t hesitate to replace.
5. Tuning Valve - Repair or replace as per need.

Our main motive is to achieve customer satisfaction and that’s why we will help you to diagnose P06A3 code by mentioning some major symptoms below:

Common Symptoms

• Failed transmission to shift between sport and economy mode
• Transmission shift malfunctioning
• Delay (or no) transmission engagement noticed
• Failed the transmission to switch between all-wheel and two-wheel drive modes
• Failed transfer to shift from low to high gear
• Poor differential engagement
• Weak Front hub engagement
• Unusual or inoperative speedometer/odometer

Here are some ways with the help of which you will be able to correct the OBD Code P06A3:

• Repair or replace Engine Sensors
• Repair or replace PCM
• Repair or replace any blown fuses

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

• Get hold of certain tools for starters. These are; diagnostic scanner, a digital volt/ohmmeter (DVOM), portable oscilloscope, your vehicle information source. Use the vehicle information source to locate and understand the function of the sensor in spotlight. Under full load, check the system fuses and fusible links. Those fuses that appear normal when there’s little load tend to fail when it’s fully loaded. All the blown fuses will have to be replaced, bear in mind that a shorted circuit has likely been the reason for the spent fuse.
• Now, proceed for a visual inspection of the sensor system and related wiring, harnesses and connectors. All those that show signs of damage will have to be repaired or replaced, as per need. Connect the scanner to the vehicle diagnostic connector to retrieve the stored codes, freeze frame data and also make note of them for future reference. After, making note of the codes you can clear them and test-drive your vehicle. If the code immediately resets and the system fuses are intact, you will need to use the DVOM to test reference voltage and ground signals. Expect 5 volts and a common ground at the sensor connector, if at all the voltage and ground signals are present on the sensor connector, then continue by testing the resistance and levels of continuity.
• The vehicle information source will have to be referred to obtain the testing specifications and help you compare the findings to what’s mentioned in it. Those sensors that do not comply as per manufacturers will have to be replaced.
• Ensure you disconnect all the relate controllers from the system circuits before proceeding to test resistance with your DVOM. If you observe no reference voltage signal at the sensor, then you will have to disconnect all the related controllers. Now use the DVOM to check the resistance and also continuity between the PCM and the sensor.
• Any open and/ shorted circuits will have to be replaced. In case you’re using an electromagnetic sensor with a reciprocating signal, you can use the oscilloscope to monitor all the live data. Specifically observe the glitches and the fully open circuits while doing this.

Common Mistakes When Diagnosing the P06A3 Code

• Engine sensor has failed
• Powertrain Control Module (PCM) has failed
• Issue with wiring