AutoCodes – GMC – P06D2 2018 GMC Sierra

P06D2 2018 GMC Sierra Code - 5V Reference 5 Circuit

Quick Answer

The Engine Control Module (ECM) has four (5) 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: P06D2 2018 GMC Sierra indicates 5V Reference 5 Circuit.
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.

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Code Popularity 190

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Sep 23, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P06D2 2018 GMC Sierra Description

The Engine Control Module (ECM) has four (5) internal 5 Volt reference circuits (Some models have two (2) internal 5 Volt reference circuits). Each internal reference circuit provides external 5 Volt reference circuits for more than one sensor. A short to ground or short to voltage on one external 5 Volt reference circuit can affect all the components connected to the same internal 5 Volt reference circuit. The Diagnostic Trouble Code (DTC) will be set when the ECM detects a short to voltage or ground on any of the 5 Volt reference circuits for greater than 0.5 s.

OBDII Code P06D2 2018 GMC Sierra - 5V Reference 5 Circuit - AutoCodes.com — P06D2 2018 GMC Sierra Code - 5V Reference 5 Circuit

What does this mean?

What are the Possible Causes of the DTC P06D2 2018 GMC Sierra?

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 P06D2 2018 GMC Sierra?

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 P06D2 2018 GMC Sierra 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 P06D2 2018 GMC Sierra code?

Need more information on how to fix the P06D2 2018 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

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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.

Frequently Asked Questions about P06D2 2018 GMC Sierra Code

1. What does the OBDII code P06D2 mean on a 2018 GMC Sierra?

P06D2 indicates an issue with the 5V Reference 5 Circuit, which supplies a stable 5-volt signal to certain sensors in the vehicle.

2. What are the common symptoms of the P06D2 code in a GMC Sierra?

Symptoms may include engine performance issues, illuminated check engine light, erratic sensor readings, or difficulty starting the vehicle.

3. What causes the P06D2 code to appear?

Common causes include a short or open circuit in the 5V reference wiring, a faulty sensor drawing excessive current, or a malfunctioning engine control module (ECM).

4. Can a bad sensor trigger the P06D2 code?

Yes, a failing sensor connected to the 5V reference circuit can trigger this code by causing voltage fluctuations or drawing excessive current.

5. How do I diagnose the P06D2 code on my 2018 GMC Sierra?

Diagnose by inspecting the 5V reference circuit wiring for damage, testing sensors connected to the circuit, and verifying proper voltage output from the ECM.

6. Is it safe to drive with the P06D2 code on my GMC Sierra?

Driving with this code is not recommended, as it may cause engine performance issues or damage other components if the problem is left unresolved.

7. How much does it cost to repair the P06D2 code?

Repair costs can vary widely, ranging from $50-$200 for minor wiring repairs to $500 or more if the ECM or a critical sensor needs replacement.

8. Can a faulty ECM cause the P06D2 code?

Yes, a malfunctioning ECM can fail to regulate the 5V reference circuit properly, leading to the P06D2 code.

9. What tools are needed to troubleshoot the P06D2 code?

You’ll need a multimeter to test voltage and continuity, a scan tool to read live data and verify sensor functionality, and potentially a wiring diagram for the 5V reference circuit.

10. How can I prevent the P06D2 code from returning?

Regularly inspect and maintain wiring and connectors, ensure sensors are functioning correctly, and address any electrical issues promptly to prevent future occurrences.