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Engine-Codes – GMC – P0699 2016 GMC Sierra

P0699 2016 GMC Sierra Code - 5V Reference 3 Circuit High Voltage

Quick Answer

The P0699 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates a problem with the 5V reference 3 circuit having high voltage. Common causes include Faulty 5V reference 3 circuit sensor, Short circuit in the wiring harness, Corrosion or poor connection at the sensor or ECM/PCM. 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 5V reference 3 circuit sensor, Short circuit in the wiring harness, Corrosion or poor connection at the sensor or ECM/PCM.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 17, 2024
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Code P0699 2016 GMC Sierra Description

The P0699 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates a problem with the 5V reference 3 circuit having high voltage. In modern vehicles, the Engine Control Module (ECM) or Powertrain Control Module (PCM) provides a 5-volt reference signal to various sensors and components in the vehicle. This reference voltage is used by these sensors to provide feedback to the ECM/PCM for proper engine operation. When the ECM/PCM detects that the voltage on the 5V reference 3 circuit is higher than expected, it triggers the P0699 code.

OBDII Code P0699 2016 GMC Sierra - 5V Reference 3 Circuit High Voltage
P0699 2016 GMC Sierra Code - 5V Reference 3 Circuit High Voltage

Common Causes of P0699 2016 GMC Sierra

  1. Faulty 5V reference 3 circuit sensor
  2. Short circuit in the wiring harness
  3. Corrosion or poor connection at the sensor or ECM/PCM
  4. ECM/PCM software issue
  5. Electrical system malfunction

Symptoms of P0699 2016 GMC Sierra

  1. Check Engine Light illuminated
  2. Engine running rough or stalling
  3. Decreased fuel efficiency
  4. Transmission shifting issues
  5. ABS or stability control warning lights on

How to Fix P0699 2016 GMC Sierra

  1. Use a diagnostic scan tool to confirm the P0699 code and identify the specific component causing the issue.
  2. Inspect the wiring harness for any visible damage, corrosion, or loose connections. Repair or replace as needed.
  3. Test the 5V reference 3 circuit sensor for proper operation. Replace if faulty.
  4. Clear the DTC and perform a test drive to ensure the issue has been resolved.
  5. If the problem persists, further diagnosis may be required to pinpoint the exact cause, such as checking the ECM/PCM for software updates or potential internal faults.

Cost to Fix P0699 2016 GMC Sierra

The typical repair costs for addressing a P0699 code on a 2016 GMC Sierra can range from $100 to $300, depending on the specific cause of the issue and the cost of parts and labor. It's important to note that diagnostic time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate. Additionally, factors such as location, vehicle make and model, and engine type can also influence repair costs.

What does this mean?

Tech Notes for P0699 2016 GMC Sierra

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

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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.

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