P06A4 GMC Code - 5 Volt Reference 4 Circuit Low Voltage
Quick Answer
The Engine Control Module (ECM) has four (4) internal 5 Volt reference circuits (Some models have two (2) internal 5 Volt reference circuits). Common causes include Faulty Sensor on 5 Volt circuit, Sensor on 5 Volt circuit harness is open or shorted, Sensor on 5 Volt circuit poor electrical connection. 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 GMC indicates 5 Volt Reference 4 Circuit Low Voltage.
- Common causes
- Common causes include Faulty Sensor on 5 Volt circuit, Sensor on 5 Volt circuit harness is open or shorted, Sensor on 5 Volt circuit poor electrical connection.
- 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.
Code P06A4 GMC Description
What are the Possible Causes of the DTC P06A4 GMC?
- Faulty Sensor on 5 Volt circuit
- Sensor on 5 Volt circuit harness is open or shorted
- Sensor on 5 Volt circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P06A4 GMC?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
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
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P06A4 GMC code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
Need more information about the P06A4 GMC code?
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Need Help with the Code?
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Information for Specific GMC Models
- P06A4 2014 GMC Sierra — 5 Volt Reference 4 Circuit Low Voltage
- P06A4 2015 GMC Sierra — 5 Volt Reference 4 Circuit Low Voltage
- P06A4 2016 GMC Sierra — 5 Volt Reference 4 Circuit Low Voltage
- P06A4 2017 GMC Sierra — 5 Volt Reference 4 Circuit Low Voltage
- P06A4 2018 GMC Sierra — 5 Volt Reference 4 Circuit Low Voltage
Frequently Asked Questions about P06A4 GMC Code
What does OBDII code P06A4 mean for a GMC vehicle?
Code P06A4 indicates a low voltage issue in the 5 Volt Reference 4 Circuit, which is responsible for supplying a stable 5V signal to certain sensors.
What are the common symptoms of code P06A4 on a GMC vehicle?
Symptoms may include engine performance issues, erratic sensor readings, warning lights on the dashboard, and potentially reduced fuel efficiency.
What causes the P06A4 code to appear on a GMC?
Common causes include a short circuit, a damaged wire or connector, a faulty sensor relying on the 5V reference circuit, or a malfunctioning powertrain control module (PCM).
Can driving with code P06A4 damage my GMC vehicle?
Yes, driving with this code can lead to incorrect sensor readings, which may harm engine performance or damage other components over time.
How do I diagnose the P06A4 code on my GMC?
Start by inspecting wiring and connectors associated with the 5 Volt Reference 4 Circuit for damage, then test the sensors and PCM for proper operation.
Which sensors might be affected by the P06A4 code on a GMC?
Sensors relying on the 5 Volt Reference 4 Circuit, such as throttle position sensors, pressure sensors, or other engine management sensors, may be impacted.
How do I fix the P06A4 code on my GMC vehicle?
Repairs may involve replacing damaged wiring, repairing connectors, replacing a faulty sensor, or reprogramming or replacing the PCM if necessary.
Can a weak battery cause the P06A4 code on a GMC?
While unlikely, electrical issues like a weak battery or alternator problems can sometimes contribute to low voltage conditions.
Is it necessary to clear the P06A4 code after repairs?
Yes, after repairing the issue, use an OBDII scanner to clear the code and verify that it does not reappear during a test drive.
How much does it cost to repair the P06A4 code on a GMC?
Repair costs vary depending on the issue but can range from $100 for wiring repairs to $500 or more for PCM replacement or sensor repairs.
Discuss the causes and fixes for P06A4 GMC OBDII Code
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