AutoCodes – GMC – P0699 2016 GMC Sierra

P0699 2016 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 2016 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 176

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 2016 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 2016 GMC Sierra - 5V Reference 3 Circuit High Voltage - AutoCodes.com — P0699 2016 GMC Sierra Code - 5V Reference 3 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0699 2016 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 2016 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 2016 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 2016 GMC Sierra Code

1. What does the OBDII code P0699 mean for a 2016 GMC Sierra?

P0699 indicates a "5V Reference 3 Circuit High Voltage" issue, meaning the engine control module (ECM) has detected an abnormally high voltage in the 5-volt reference circuit used by certain sensors.

2. What are the symptoms of code P0699 in a 2016 GMC Sierra?

Common symptoms include the check engine light turning on, rough engine performance, erratic sensor readings, and in some cases, issues with starting or drivability.

3. What causes the P0699 code to appear?

Potential causes include a short circuit in the 5-volt reference wiring, a faulty sensor, corroded or damaged wiring/connectors, or a malfunctioning ECM.

4. Which sensors use the 5V reference circuit in a 2016 GMC Sierra?

The 5V reference circuit typically powers sensors like the throttle position sensor (TPS), manifold absolute pressure (MAP) sensor, and crankshaft position sensor.

5. Can I drive my 2016 GMC Sierra with a P0699 code?

While the vehicle may still operate, driving with this code is not recommended as it can lead to further damage or unsafe driving conditions due to erratic sensor behavior.

6. How do I diagnose the P0699 code?

Start by inspecting the 5V reference circuit wiring and connectors for damage. Use a multimeter to check for proper voltage, and test the sensors on the circuit to identify any faults.

7. What repairs are needed to fix a P0699 code?

Repairs may include fixing or replacing damaged wiring or connectors, replacing a faulty sensor, or, in rare cases, reprogramming or replacing the ECM.

8. Can a bad ECM cause the P0699 code?

Yes, a malfunctioning ECM can cause the P0699 code, though this is less common compared to wiring or sensor issues.

9. How much does it cost to fix a P0699 code on a 2016 GMC Sierra?

The repair cost varies depending on the root cause. Wiring repairs might cost $100-$300, while sensor replacement can range from $150-$400. ECM replacement is more expensive, often exceeding $1,000.

10. How can I prevent the P0699 code from returning?

Regular maintenance, including inspecting wiring and connectors for wear and ensuring sensors are in good condition, can help prevent this issue.