P06A3 2018 GMC Sierra Code - 5 Volt Reference 4 Circuit
Quick Answer
The P06A3 diagnostic trouble code (DTC) for a 2018 GMC Sierra refers to a problem with the 5 Volt Reference 4 Circuit. Common causes include Faulty wiring or connectors in the 5 Volt Reference 4 Circuit, Short circuit in the ECM, Sensor malfunction drawing excessive current. 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 GMC Sierra indicates 5 Volt Reference 4 Circuit.
- Common causes
- Common causes include Faulty wiring or connectors in the 5 Volt Reference 4 Circuit, Short circuit in the ECM, Sensor malfunction drawing excessive current.
- 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.
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Code P06A3 2018 GMC Sierra Description
The P06A3 diagnostic trouble code (DTC) for a 2018 GMC Sierra refers to a problem with the 5 Volt Reference 4 Circuit. In modern vehicles, the Engine Control Module (ECM) sends out 5-volt reference signals to various sensors throughout the engine and transmission system. These sensors use the 5-volt reference signal to provide crucial data to the ECM for proper engine operation, fuel delivery, and emissions control.
Common Causes of P06A3 2018 GMC Sierra
- Faulty wiring or connectors in the 5 Volt Reference 4 Circuit
- Short circuit in the ECM
- Sensor malfunction drawing excessive current
- ECM software issue
- Water damage or corrosion in the ECM connectors
Symptoms of P06A3 2018 GMC Sierra
- Erratic engine performance
- Poor fuel economy
- Rough idling
- Stalling
- Limp mode activation
How to Fix P06A3 2018 GMC Sierra
- Begin by visually inspecting the wiring and connectors in the 5 Volt Reference 4 Circuit for any visible damage or corrosion.
- Use a multimeter to test the voltage output of the sensors connected to the circuit and compare them to the manufacturer's specifications.
- Check for any shorts in the ECM by disconnecting the sensors one by one and monitoring the voltage output.
- If no issues are found with the wiring, connectors, or sensors, reprogram the ECM with the latest software update provided by the manufacturer.
Cost to Fix P06A3 2018 GMC Sierra
The cost of repairing a P06A3 code on a 2018 GMC Sierra can vary depending on the specific cause of the issue. In general, the repair costs can range from $100 to $500, including parts and labor. However, as labor rates at auto repair shops can vary, it is advisable to check with local shops for a more accurate estimate based on your location and the severity of the problem.
Tech Notes for P06A3 2018 GMC Sierra
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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