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Engine-Codes – GMC – P06A3 2014 GMC Sierra

P06A3 2014 GMC Sierra Code - 5 Volt Reference 4 Circuit

Quick Answer

The P06A3 diagnostic trouble code (DTC) indicates a problem with the 5 Volt Reference 4 circuit in a 2014 GMC Sierra. Common causes include Damaged or corroded wiring in the 5 Volt Reference 4 circuit, Faulty or malfunctioning sensors that rely on the 5 Volt Reference, A defective Engine Control Module (ECM). 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 2014 GMC Sierra indicates 5 Volt Reference 4 Circuit.
Common causes
Common causes include Damaged or corroded wiring in the 5 Volt Reference 4 circuit, Faulty or malfunctioning sensors that rely on the 5 Volt Reference, A defective Engine Control Module (ECM).
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 Oct 17, 2024
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Code P06A3 2014 GMC Sierra Description

The P06A3 diagnostic trouble code (DTC) indicates a problem with the 5 Volt Reference 4 circuit in a 2014 GMC Sierra. This code is part of the vehicle's onboard diagnostics system and signifies that the Engine Control Module (ECM) has detected an issue with the voltage supplied to various sensors and components that rely on this reference voltage. The 5 Volt Reference circuit is crucial for the operation of multiple sensors, including throttle position sensors, manifold absolute pressure sensors, and various other input devices that provide critical data to the ECM for optimal engine performance.

OBDII Code P06A3 2014 GMC Sierra - 5 Volt Reference 4 Circuit
P06A3 2014 GMC Sierra Code - 5 Volt Reference 4 Circuit

Common Causes of P06A3 2014 GMC Sierra

  1. Damaged or corroded wiring in the 5 Volt Reference 4 circuit.
  2. Faulty or malfunctioning sensors that rely on the 5 Volt Reference.
  3. A defective Engine Control Module (ECM).
  4. Poor electrical connections or loose connectors in the circuit.
  5. Short circuits or open circuits in the wiring harness.

Symptoms of P06A3 2014 GMC Sierra

  1. Check Engine Light illuminated on the dashboard.
  2. Erratic engine performance, including stalling or rough idling.
  3. Difficulty starting the engine or prolonged cranking time.
  4. Poor fuel economy and increased emissions.
  5. Inconsistent readings from engine sensors, such as throttle position or manifold pressure.

How to Fix P06A3 2014 GMC Sierra

  1. Visual Inspection: Begin with a thorough visual inspection of the wiring and connectors associated with the 5 Volt Reference 4 circuit. Look for signs of damage, corrosion, or loose connections.
  2. Voltage Testing: Use a multimeter to test the voltage output on the 5 Volt Reference circuit. Ensure that the voltage is within specifications (typically around 5 volts). If the voltage is absent or incorrect, further investigation is needed.
  3. Sensor Testing: Check the sensors that rely on the 5 Volt Reference for proper operation. Replace any faulty sensors as necessary.
  4. Repair Wiring Issues: If any damaged wiring or connectors are found, repair or replace them to restore proper electrical flow in the circuit.
  5. ECM Check: If all other components are functioning correctly, consider testing or replacing the ECM, as it may be the source of the issue.

Cost to Fix P06A3 2014 GMC Sierra

The cost to repair a P06A3 code can vary significantly based on the specific issue identified during diagnosis. On average, repair costs can range from $100 to $500, depending on whether it involves simple wiring repairs or more complex ECM replacement. Labor rates typically range from $80 to $150 per hour, with metropolitan areas or dealerships often charging higher rates. Independent shops may offer lower rates. It is advisable to check local rates for a more precise estimate and to consider that the diagnosis time may vary based on the complexity of the issue and the shop's workload.

What does this mean?

Tech Notes for P06A3 2014 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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