P06A4 Code - Sensor Reference Voltage 'D' Circuit Low
Quick Answer
The control module has internal 5-volt reference buses called "5-volt reference". Common causes include Faulty Engine Control Module (ECM), ECM harness is open or shorted, ECM 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 indicates Sensor Reference Voltage 'D' Circuit Low.
- Common causes
- Common causes include Faulty Engine Control Module (ECM), ECM harness is open or shorted, ECM 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 Description
What are the Possible Causes of the DTC P06A4?
- Faulty Engine Control Module (ECM)
- ECM harness is open or shorted
- ECM circuit poor electrical connection
- Shorted sensor on 5 volt circuit
How to Fix the DTC P06A4?
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.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P06A4 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.
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Information for Specific Makes
- P06A4 Buick — 5 Volt Reference 4 Circuit Low Voltage
- P06A4 Cadillac — 5 Volt Reference 4 Circuit Low Voltage
- P06A4 Chevrolet — 5 Volt Reference 4 Circuit Low Voltage
- P06A4 Chrysler — Sensor Reference Voltage 'D' Circuit Low
- P06A4 Dodge — Sensor Reference Voltage 'D' Circuit Low
- P06A4 GMC — 5 Volt Reference 4 Circuit Low Voltage
- P06A4 Hyundai — Sensor Reference Voltage 'D' Circuit Low
- P06A4 Jeep — Sensor Reference Voltage 'D' Circuit Low
- P06A4 KIA — Sensor Reference Voltage 'D' Circuit Low
Frequently Asked Questions about P06A4 Code
1. What does the OBDII code P06A4 mean?
P06A4 indicates that the Sensor Reference Voltage 'D' circuit is registering a voltage lower than the acceptable range, which can disrupt proper sensor operation.
2. What are the common symptoms of code P06A4?
Symptoms may include the check engine light turning on, poor engine performance, rough idling, reduced fuel efficiency, or issues with sensors dependent on the reference voltage.
3. What causes the P06A4 code to appear?
Common causes include damaged wiring or connectors in the Sensor Reference Voltage 'D' circuit, a faulty powertrain control module (PCM), or a defective sensor requiring the reference voltage.
4. Can a bad PCM cause the P06A4 code?
Yes, a malfunctioning PCM can fail to regulate the reference voltage properly, leading to the P06A4 code.
5. How do I diagnose the P06A4 code?
Start by checking the wiring and connectors for damage or corrosion, test the voltage at the sensor, and inspect the PCM for proper output.
6. Can I drive with the P06A4 code active?
Driving with this code is not recommended, as it can lead to further engine performance issues or damage to other components.
7. How is the P06A4 code typically fixed?
Repairs often include fixing or replacing damaged wiring, replacing a faulty sensor, or reprogramming or replacing the PCM if necessary.
8. How much does it cost to repair the P06A4 code?
Repair costs vary depending on the cause but may range from $50 for minor wiring repairs to $800 or more if the PCM needs replacement.
9. Can a dead battery cause the P06A4 code?
A weak or dead battery can potentially cause voltage-related issues, but it is less likely to directly trigger the P06A4 code.
10. Will clearing the P06A4 code solve the problem?
Clearing the code without addressing the underlying issue will not fix the problem, and the code is likely to reappear.
Discuss the causes and fixes for P06A4 OBDII Code
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