AutoCodes – GMC – P0699 GMC

P0699 GMC Code - 5V Reference 3 Circuit High 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: P0699 GMC indicates 5V Reference 3 Circuit High 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.

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Code Popularity 2,042

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 17, 2022

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0699 GMC Description

The Engine Control Module (ECM) has four (4) 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 higher than the expected voltage on any of the 5 Volt reference circuits for greater than 0.5 s.

OBDII Code P0699 GMC - 5V Reference 3 Circuit High Voltage - AutoCodes.com — P0699 GMC Code - 5V Reference 3 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0699 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 P0699 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.

What does this mean?

Code Tech Notes

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 3 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 2
- Manifold absolute pressure sensor

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0699 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 P0699 GMC code?

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Need Help with the Code?

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Information for Specific GMC Models

P0699 2014 GMC Sierra — 5V Reference 3 Circuit High Voltage
P0699 2015 GMC Sierra — 5V Reference 3 Circuit High Voltage
P0699 2016 GMC Sierra — 5V Reference 3 Circuit High Voltage
P0699 2017 GMC Sierra — 5V Reference 3 Circuit High Voltage
P0699 2018 GMC Sierra — 5V Reference 3 Circuit High Voltage

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 P0699 GMC Code

1. What are the common symptoms of OBDII code P0699 GMC (5V Reference 3 Circuit High Voltage)?

The common symptoms include illuminated Check Engine Light, engine stalling, rough idling, and issues with the vehicle's electrical components.

2. What are the possible causes of OBDII code P0699 GMC?

Possible causes of this code include a faulty 5V reference circuit, damaged wiring or connectors in the circuit, a malfunctioning Engine Control Module (ECM), or a short circuit in the system.

3. How can I diagnose OBDII code P0699 GMC?

Diagnosing this code involves using a scan tool to read the code, checking the voltage on the 5V reference circuit, inspecting wiring and connectors for damage, and testing the ECM for proper function.

4. Can I still drive my vehicle with OBDII code P0699 GMC?

It is not recommended to drive your vehicle with this code as it can cause engine performance issues and potential damage to electrical components.

5. How can I repair OBDII code P0699 GMC?

Repairing this code may involve repairing or replacing damaged wiring and connectors, replacing the ECM if necessary, and ensuring the 5V reference circuit is functioning correctly.

6. Can a DIY enthusiast fix OBDII code P0699 GMC?

While some experienced DIY enthusiasts may be able to diagnose and repair this code, it is recommended to seek professional help due to the complexity of the electrical components involved.

7. Is OBDII code P0699 GMC a serious issue?

Yes, this code should be addressed promptly as it can lead to engine performance issues, electrical component failures, and potential safety hazards.

8. How much does it cost to fix OBDII code P0699 GMC?

The cost of fixing this code can vary depending on the underlying cause, but it may range from a few hundred dollars to over a thousand dollars for parts and labor.

9. Will resetting the Check Engine Light resolve OBDII code P0699 GMC?

Resetting the Check Engine Light may temporarily turn off the light, but it will not fix the underlying issue causing the code to appear.

10. How long does it take to repair OBDII code P0699 GMC?

The repair time for this code can vary depending on the exact cause and the availability of parts, but it may take a few hours to a full day for a professional mechanic to diagnose and repair the issue.