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P06A3 2015 GMC Sierra Code - 5 Volt Reference 4 Circuit

Quick Answer

The P06A3 diagnostic trouble code (DTC) for a 2015 GMC Sierra relates to the 5 Volt Reference 4 Circuit. Common causes include Damaged wiring or connectors in the 5-volt reference circuit, Faulty sensor drawing too much current from the circuit, Power supply issues to the circuit. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P06A3 2015 GMC Sierra indicates 5 Volt Reference 4 Circuit.
Common causes
Common causes include Damaged wiring or connectors in the 5-volt reference circuit, Faulty sensor drawing too much current from the circuit, Power supply issues to the circuit.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 13, 2024
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Code P06A3 2015 GMC Sierra Description

The P06A3 diagnostic trouble code (DTC) for a 2015 GMC Sierra relates to the 5 Volt Reference 4 Circuit. This code indicates that there is a malfunction in the circuit responsible for providing a 5-volt reference signal to various sensors and components in the vehicle. The 5-volt reference signal is crucial for the proper operation of sensors such as the throttle position sensor, manifold absolute pressure sensor, and others. When this circuit malfunctions, it can lead to inaccurate sensor readings, which can affect the vehicle's performance, fuel efficiency, and emissions.

OBDII Code P06A3 2015 GMC Sierra - 5 Volt Reference 4 Circuit
P06A3 2015 GMC Sierra Code - 5 Volt Reference 4 Circuit

Common Causes of P06A3 2015 GMC Sierra

  1. Damaged wiring or connectors in the 5-volt reference circuit
  2. Faulty sensor drawing too much current from the circuit
  3. Power supply issues to the circuit
  4. Corrosion or contamination in the circuit

Symptoms of P06A3 2015 GMC Sierra

  1. Check Engine Light illuminated
  2. Engine performance issues such as rough idling or stalling
  3. Hesitation during acceleration
  4. Inaccurate sensor readings
  5. Poor fuel efficiency

How to Fix P06A3 2015 GMC Sierra

  1. Begin by conducting a thorough inspection of the 5-volt reference circuit, checking for any visible damage to wiring or connectors.
  2. Test the sensors that rely on the 5-volt reference signal to determine if any are drawing excessive current or providing inaccurate readings.
  3. Check the power supply to the circuit to ensure it is functioning correctly.
  4. Replace any damaged wiring, connectors, or faulty sensors as needed.
  5. Clear the DTC and test drive the vehicle to verify that the issue has been resolved.

Cost to Fix P06A3 2015 GMC Sierra

The typical repair costs for addressing a P06A3 code can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, the cost of parts for this repair could range from $50 to $200, while labor costs could range from $100 to $300. It's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate based on your location and vehicle.

What does this mean?

Tech Notes for P06A3 2015 GMC Sierra

Disconnecting one component at a time from the affected 5 Volt reference circuit while observing the scan tool 5 Volt Reference Circuit Status parameter may help locate the fault. The scan tool parameter will change from Malfunction to OK when the source of the fault is disconnected. If all 5 Volt reference components have been disconnected and a fault is still indicated, the fault may exist in the wiring harness.



The 5 Volt reference 4 circuit provides 5 Volt to the following sensors: (Some models may have different sensors, please consult the factory service manual for the list of sensors for your model and year)



- Accelerator pedal position sensor 1

- Throttle position sensor

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

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