AutoCodes – GMC – P0699 2015 GMC Sierra

P0699 2015 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 2015 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 180

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 2015 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 2015 GMC Sierra - 5V Reference 3 Circuit High Voltage - AutoCodes.com — P0699 2015 GMC Sierra Code - 5V Reference 3 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0699 2015 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 2015 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 2015 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 2015 GMC Sierra Code

1. What does the OBDII code P0699 mean on a 2015 GMC Sierra?

P0699 indicates a "5V Reference 3 Circuit High Voltage" issue, meaning the voltage in the 5V reference circuit for certain sensors is higher than expected.

2. What are the symptoms of a P0699 code on a 2015 GMC Sierra?

Symptoms may include a check engine light, poor engine performance, erratic sensor readings, or failure of systems relying on the affected 5V reference circuit.

3. What causes the P0699 code to appear?

Common causes include a short to voltage in the 5V reference circuit, a faulty sensor, damaged wiring, or a malfunctioning engine control module (ECM).

4. Which sensors are affected by the 5V Reference 3 Circuit in a 2015 GMC Sierra?

The 5V Reference 3 Circuit typically supplies power to sensors like the throttle position sensor, MAP sensor, or other engine-related sensors. Check your vehicleâ€™s wiring diagram for specifics.

5. Can I drive my 2015 GMC Sierra with a P0699 code?

Driving with a P0699 code is not recommended, as it may result in poor performance or damage to engine components due to incorrect sensor readings.

6. How do I diagnose the P0699 code on my 2015 GMC Sierra?

Start by inspecting the wiring and connectors in the 5V reference circuit, testing the sensors connected to the circuit, and checking for a short to voltage or an open circuit.

7. How do I fix the P0699 code on a 2015 GMC Sierra?

Repairs may include replacing a damaged sensor, repairing or replacing faulty wiring, or in rare cases, replacing the ECM if itâ€™s determined to be defective.

8. Can a faulty sensor cause the P0699 code?

Yes, a faulty sensor drawing excessive voltage or failing internally can cause the 5V reference circuit to report high voltage, triggering the code.

9. How much does it cost to fix a P0699 code on a 2015 GMC Sierra?

Costs vary depending on the root cause. A sensor replacement may cost $50-$200, while wiring repairs or ECM replacement could range from $100 to $1,000.

10. Will clearing the code fix P0699 on my 2015 GMC Sierra?

Clearing the code without addressing the root cause will only temporarily remove the code. The issue must be diagnosed and repaired to prevent it from returning.