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P06A4 2018 Chevrolet Silverado Code - 5 Volt Reference 4 Circuit Low Voltage

Quick Answer

The P06A4 diagnostic trouble code (DTC) indicates a low voltage condition in the 5 Volt Reference 4 circuit of a 2018 Chevrolet Silverado. Common causes include Wiring Issues: Damaged or corroded wiring in the 5 Volt Reference circuit can lead to low voltage conditions, Faulty Sensors: A malfunctioning sensor that draws too much current can affect the voltage supplied to the circuit, ECM Malfunction: A failing engine control module may not provide the correct reference voltage. 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
P06A4 2018 Chevrolet Silverado indicates 5 Volt Reference 4 Circuit Low Voltage.
Common causes
Common causes include Wiring Issues: Damaged or corroded wiring in the 5 Volt Reference circuit can lead to low voltage conditions, Faulty Sensors: A malfunctioning sensor that draws too much current can affect the voltage supplied to the circuit, ECM Malfunction: A failing engine control module may not provide the correct reference voltage.
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 16, 2024
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Code P06A4 2018 Chevrolet Silverado Description

The P06A4 diagnostic trouble code (DTC) indicates a low voltage condition in the 5 Volt Reference 4 circuit of a 2018 Chevrolet Silverado. This circuit is crucial as it supplies a stable 5-volt reference voltage to various sensors and components within the vehicle's engine management system. These sensors may include the throttle position sensor, manifold absolute pressure sensor, and others that rely on this voltage to function correctly. When the voltage drops below the expected threshold, it can lead to erratic sensor readings, which may cause the engine control module (ECM) to make incorrect adjustments to fuel delivery, ignition timing, and other critical parameters.

OBDII Code P06A4 2018 Chevrolet Silverado - 5 Volt Reference 4 Circuit Low Voltage
P06A4 2018 Chevrolet Silverado Code - 5 Volt Reference 4 Circuit Low Voltage

Common Causes of P06A4 2018 Chevrolet Silverado

  1. Wiring Issues: Damaged or corroded wiring in the 5 Volt Reference circuit can lead to low voltage conditions.
  2. Faulty Sensors: A malfunctioning sensor that draws too much current can affect the voltage supplied to the circuit.
  3. ECM Malfunction: A failing engine control module may not provide the correct reference voltage.
  4. Ground Issues: Poor grounding connections can lead to voltage drops in the circuit.
  5. Short Circuits: Shorts to ground or other circuits can disrupt the normal operation of the 5 Volt Reference circuit.

Symptoms of P06A4 2018 Chevrolet Silverado

  1. Check Engine Light: The most common symptom is the illumination of the check engine light on the dashboard.
  2. Poor Engine Performance: Drivers may notice hesitation, stalling, or sluggish acceleration due to incorrect sensor readings.
  3. Increased Emissions: The vehicle may fail emissions tests due to improper fuel mixture adjustments.
  4. Erratic Sensor Readings: Malfunctioning sensors may provide inconsistent data, leading to poor engine management.
  5. Reduced Fuel Economy: A drop in fuel efficiency can occur as the engine struggles to maintain optimal performance.

How to Fix P06A4 2018 Chevrolet Silverado

  1. Visual Inspection: Begin with a thorough visual inspection of the wiring and connectors associated with the 5 Volt Reference 4 circuit for signs of damage or corrosion.
  2. Check Voltage Levels: Use a multimeter to measure the voltage at the reference circuit to confirm the low voltage condition.
  3. Test Sensors: Disconnect sensors connected to the 5 Volt Reference circuit and test them individually to identify any that may be drawing excessive current.
  4. Repair or Replace Wiring: If damaged wiring or connectors are found, repair or replace them as necessary to restore proper voltage levels.
  5. ECM Testing: If no issues are found with wiring or sensors, further diagnostics on the ECM may be required to determine if it is functioning correctly.

Cost to Fix P06A4 2018 Chevrolet Silverado

The cost to repair a P06A4 code can vary significantly based on the underlying cause of the issue. Typical repair costs can range from $100 to $500. This estimate includes parts such as wiring harnesses or sensors, which may cost between $20 and $200, and labor costs that can range from $80 to $150 per hour. The specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. In metropolitan areas or at dealerships, rates may be higher, while independent shops often charge less. It's advisable to check local rates for a more precise estimate.

What does this mean?

Tech Notes for P06A4 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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