AutoCodes – GMC – P0699 2014 GMC Sierra

P0699 2014 GMC Sierra 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 2014 GMC Sierra 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 220

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 2014 GMC Sierra 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 2014 GMC Sierra - 5V Reference 3 Circuit High Voltage - AutoCodes.com — P0699 2014 GMC Sierra Code - 5V Reference 3 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0699 2014 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 P0699 2014 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 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 2014 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.

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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 P0699 2014 GMC Sierra Code

1. What does the OBDII code P0699 mean on a 2014 GMC Sierra?

P0699 indicates a "5V Reference 3 Circuit High Voltage" issue, meaning the reference voltage from the powertrain control module (PCM) has exceeded its expected range.

2. What are the common symptoms of a P0699 code in a 2014 GMC Sierra?

Symptoms may include the check engine light turning on, erratic engine performance, poor fuel economy, or issues with sensors relying on the 5V reference signal.

3. What causes the P0699 code to trigger in a 2014 GMC Sierra?

Possible causes include a short to voltage in the 5V reference circuit, a faulty sensor connected to the circuit, a damaged PCM, or corroded or damaged wiring and connectors.

4. Which sensors are typically associated with the 5V reference 3 circuit in a 2014 GMC Sierra?

The 5V reference 3 circuit may include sensors like the throttle position sensor (TPS), manifold absolute pressure (MAP) sensor, or others depending on the specific configuration of the vehicle.

5. How do I diagnose the P0699 code in my 2014 GMC Sierra?

Start by inspecting the wiring and connectors for damage or corrosion, test the voltage in the 5V reference circuit, and check the sensors connected to the circuit. Use a scan tool to monitor live data and pinpoint the issue.

6. Can a faulty PCM cause the P0699 code in a 2014 GMC Sierra?

Yes, a malfunctioning PCM can cause the P0699 code if it fails to regulate the 5V reference signal properly, though this is less common than wiring or sensor issues.

7. How do I fix the P0699 code in a 2014 GMC Sierra?

Repairs may include fixing or replacing damaged wiring, replacing a faulty sensor, or, in rare cases, replacing the PCM if it is verified to be the root cause.

8. Is it safe to drive my 2014 GMC Sierra with a P0699 code?

While the vehicle may still be drivable, continuing to drive with this code can lead to poor performance, further damage to components, or safety risks. Prompt diagnosis and repair are recommended.

9. How much does it cost to repair the P0699 code on a 2014 GMC Sierra?

Repair costs vary depending on the root cause. Replacing wiring or connectors may cost under $100, while replacing a sensor or PCM can range from $200 to $1,000 or more, including labor.

10. Can I clear the P0699 code without fixing the issue on my 2014 GMC Sierra?

Clearing the code with a scan tool will remove the check engine light temporarily, but the code will likely return if the underlying issue is not resolved.