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P06A3 2018 Chevrolet Silverado Code - 5 Volt Reference 4 Circuit

Quick Answer

The P06A3 diagnostic trouble code (DTC) in a 2018 Chevrolet Silverado relates to the 5 Volt Reference 4 Circuit. Common causes include Damaged wiring or connectors in the 5-volt reference circuit, Faulty sensor or component drawing excessive current, 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 2018 Chevrolet Silverado indicates 5 Volt Reference 4 Circuit.
Common causes
Common causes include Damaged wiring or connectors in the 5-volt reference circuit, Faulty sensor or component drawing excessive current, 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 15, 2024
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Code P06A3 2018 Chevrolet Silverado Description

The P06A3 diagnostic trouble code (DTC) in a 2018 Chevrolet Silverado 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.

OBDII Code P06A3 2018 Chevrolet Silverado - 5 Volt Reference 4 Circuit
P06A3 2018 Chevrolet Silverado Code - 5 Volt Reference 4 Circuit

Common Causes of P06A3 2018 Chevrolet Silverado

  1. Damaged wiring or connectors in the 5-volt reference circuit
  2. Faulty sensor or component drawing excessive current
  3. Power supply issues to the circuit
  4. Corrosion or moisture affecting the circuit
  5. Electronic control module (ECM) malfunction

Symptoms of P06A3 2018 Chevrolet Silverado

  1. Rough idling or engine stalling
  2. Loss of power or acceleration
  3. Reduced fuel efficiency
  4. Check Engine Light illuminated
  5. Vehicle going into limp mode

How to Fix P06A3 2018 Chevrolet Silverado

  1. Begin by conducting a visual inspection of the wiring and connectors in the 5-volt reference circuit to check for any damage or corrosion.
  2. Use a multimeter to test the voltage output of the circuit and identify any irregularities.
  3. Test each sensor or component connected to the 5-volt reference circuit to determine if any are drawing excessive current.
  4. Replace any damaged wiring, connectors, sensors, or components as needed.
  5. Clear the DTC and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P06A3 2018 Chevrolet Silverado

The typical repair costs for addressing a P06A3 code in a 2018 Chevrolet Silverado can vary depending on the specific cause of the issue. In general, the cost of parts such as wiring, connectors, sensors, or components may range from $100 to $500. Labor costs at an auto repair shop can add an additional $100 to $300, depending on the shop's hourly rates and the complexity of the repair. It is advisable to check with local repair shops for more accurate estimates based on your location and vehicle specifics.

What does this mean?

Tech Notes for P06A3 2018 Chevrolet Silverado

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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