P06A4 GMC Code - 5 Volt Reference 4 Circuit Low Voltage
Quick Answer
The P06A4 diagnostic trouble code (DTC) for GMC vehicles indicates a 5 Volt Reference 4 Circuit Low Voltage issue. Common causes include Faulty 5-volt reference voltage regulator, Short circuit or open circuit in the 5 Volt Reference 4 Circuit, Corrosion or poor connection in the wiring harness. 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 5-volt reference voltage regulator, Short circuit or open circuit in the 5 Volt Reference 4 Circuit, Corrosion or poor connection in the wiring harness.
- 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 P06A4 GMC Description
The P06A4 diagnostic trouble code (DTC) for GMC vehicles indicates a 5 Volt Reference 4 Circuit Low Voltage issue. In modern vehicles, the Engine Control Module (ECM) provides various reference voltages to different sensors and components in the vehicle. The 5-volt reference circuit is crucial for the proper functioning of these sensors and components. When the ECM detects that the voltage on the 5 Volt Reference 4 Circuit is below the specified threshold, it triggers the P06A4 code.
Common Causes of P06A4 GMC
- Faulty 5-volt reference voltage regulator
- Short circuit or open circuit in the 5 Volt Reference 4 Circuit
- Corrosion or poor connection in the wiring harness
- Defective sensors connected to the 5-volt reference circuit
- ECM malfunction or software issue
Symptoms of P06A4 GMC
- Rough idling or engine misfires
- Poor acceleration or lack of power
- Decreased fuel efficiency
- Engine stalling or hesitation
- Illumination of the Check Engine Light
How to Fix P06A4 GMC
- Perform a thorough inspection of the wiring harness and connectors related to the 5 Volt Reference 4 Circuit.
- Test the 5-volt reference voltage regulator for proper operation and replace if necessary.
- Check and replace any faulty sensors connected to the 5-volt reference circuit.
- Clear the DTC and reset the ECM to see if the code reappears after the repair.
- Perform a road test to ensure the issue has been resolved and all systems are functioning correctly.
Cost to Fix P06A4 GMC
The typical repair costs for addressing a P06A4 code can vary depending on the specific cause of the issue and the parts and labor required for the repair. In general, the cost of parts for replacing a faulty voltage regulator or sensor can range from $50 to $200, while labor costs can add an additional $100 to $300. Overall, the total repair cost for resolving a 5 Volt Reference 4 Circuit Low Voltage issue can amount to anywhere from $150 to $500. It is advisable to consult with a professional mechanic or auto repair shop to get an accurate estimate based on your vehicle's make and model, as well as local labor rates.
Tech Notes for P06A4 GMC
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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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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