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Engine-Codes – GMC – P0698 2016 GMC Sierra

P0698 2016 GMC Sierra Code - 5V Reference 3 Circuit Low Voltage

Quick Answer

The P0698 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates that there is a low voltage condition in the 5V reference 3 circuit. Common causes include Faulty 5V Reference 3 Circuit: A damaged or shorted 5V reference 3 circuit can cause a low voltage condition, triggering the P0698 code, Wiring Issues: Corrosion, damage, or poor connections in the wiring harness related to the 5V reference 3 circuit can lead to low voltage, Faulty Sensors: A malfunctioning sensor connected to the 5V reference 3 circuit, such as the throttle position sensor or fuel pressure sensor, can cause the voltage to drop. 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
P0698 2016 GMC Sierra indicates 5V Reference 3 Circuit Low Voltage.
Common causes
Common causes include Faulty 5V Reference 3 Circuit: A damaged or shorted 5V reference 3 circuit can cause a low voltage condition, triggering the P0698 code, Wiring Issues: Corrosion, damage, or poor connections in the wiring harness related to the 5V reference 3 circuit can lead to low voltage, Faulty Sensors: A malfunctioning sensor connected to the 5V reference 3 circuit, such as the throttle position sensor or fuel pressure sensor, can cause the voltage to drop.
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 P0698 2016 GMC Sierra Description

The P0698 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates that there is a low voltage condition in the 5V reference 3 circuit. In modern vehicles, the Engine Control Module (ECM) or Powertrain Control Module (PCM) provides several reference voltages to various sensors and components throughout the vehicle. The 5V reference 3 circuit is responsible for supplying a 5-volt reference signal to certain sensors, such as the throttle position sensor, fuel pressure sensor, and more.

OBDII Code P0698 2016 GMC Sierra - 5V Reference 3 Circuit Low Voltage
P0698 2016 GMC Sierra Code - 5V Reference 3 Circuit Low Voltage

Common Causes of P0698 2016 GMC Sierra

  1. Faulty 5V Reference 3 Circuit: A damaged or shorted 5V reference 3 circuit can cause a low voltage condition, triggering the P0698 code.
  2. Wiring Issues: Corrosion, damage, or poor connections in the wiring harness related to the 5V reference 3 circuit can lead to low voltage.
  3. Faulty Sensors: A malfunctioning sensor connected to the 5V reference 3 circuit, such as the throttle position sensor or fuel pressure sensor, can cause the voltage to drop.
  4. ECM/PCM Malfunction: An issue with the Engine Control Module or Powertrain Control Module can also result in a low voltage condition in the 5V reference 3 circuit.

Symptoms of P0698 2016 GMC Sierra

  1. Check Engine Light: The most common symptom associated with the P0698 code is the illumination of the Check Engine Light on the vehicle's dashboard.
  2. Reduced Engine Performance: The vehicle may experience a decrease in engine performance, such as reduced power output or acceleration.
  3. Poor Fuel Efficiency: A low voltage in the 5V reference 3 circuit can lead to poor fuel efficiency, causing the vehicle to consume more fuel than usual.
  4. Rough Idle: The engine may idle roughly or inconsistently due to the improper functioning of sensors affected by the low voltage condition.

How to Fix P0698 2016 GMC Sierra

  1. Diagnose the Issue: Use a diagnostic scanner to retrieve the trouble codes and perform voltage tests to pinpoint the source of the low voltage in the 5V reference 3 circuit.
  2. Inspect Wiring and Connections: Check the wiring harness and connectors related to the 5V reference 3 circuit for any damage, corrosion, or loose connections. Repair or replace as necessary.
  3. Test Sensors: Test the sensors connected to the 5V reference 3 circuit to determine if any are faulty and causing the low voltage condition. Replace any malfunctioning sensors.
  4. Check ECM/PCM: Verify the functionality of the Engine Control Module or Powertrain Control Module to ensure it is not causing the issue. If necessary, reprogram or replace the ECM/PCM.
  5. Clear Codes and Test Drive: Clear the diagnostic trouble codes from the ECM's memory, then test drive the vehicle to confirm that the issue has been resolved and that the Check Engine Light does not reappear.

Cost to Fix P0698 2016 GMC Sierra

The typical repair costs for addressing a P0698 code on a 2016 GMC Sierra can vary depending on the specific cause of the issue. In general, the cost of parts for this repair can range from $50 to $200, with labor costs adding an additional $100 to $200. The total cost can therefore be estimated to be between $150 and $400. It's important to note that the actual costs may differ based on the location of the repair shop, the make and model of the vehicle, and the rates charged for diagnosis and labor. It is advisable to consult with a trusted mechanic or auto repair shop to obtain a more accurate estimate based on your specific circumstances.

What does this mean?

Tech Notes for P0698 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 P0698 2016 GMC Sierra Code

1. What are the common symptoms of OBDII code P0698 in a 2016 GMC Sierra?

The common symptoms of OBDII code P0698, which indicates a 5V Reference 3 Circuit Low Voltage issue in a 2016 GMC Sierra, include rough idling, stalling, and a decrease in engine performance.

2. What are the potential causes of OBDII code P0698 in a 2016 GMC Sierra?

The potential causes of OBDII code P0698 in a 2016 GMC Sierra can include a faulty 5V reference circuit, damaged wiring or connectors related to the circuit, or a malfunctioning Engine Control Module (ECM).

3. How can I diagnose the OBDII code P0698 in my 2016 GMC Sierra?

Diagnosing OBDII code P0698 in a 2016 GMC Sierra involves using a diagnostic scanner to retrieve the fault code, inspecting the 5V reference circuit for any visible damage, and testing the circuit components for proper voltage readings.

4. Is it safe to continue driving with OBDII code P0698 in my 2016 GMC Sierra?

It is not recommended to continue driving with OBDII code P0698 in a 2016 GMC Sierra, as it can lead to further damage to the vehicle's engine and components. It is best to address the issue promptly.

5. Can I repair OBDII code P0698 in my 2016 GMC Sierra myself?

Depending on your level of automotive expertise, you may be able to repair OBDII code P0698 in a 2016 GMC Sierra yourself. However, it is recommended to consult a professional mechanic for an accurate diagnosis and proper repair.

6. How much does it typically cost to repair OBDII code P0698 in a 2016 GMC Sierra?

The cost of repairing OBDII code P0698 in a 2016 GMC Sierra can vary depending on the specific cause of the issue. It may range from a simple wiring repair to a more complex ECM replacement, potentially costing a few hundred to over a thousand dollars.

7. Can a faulty sensor trigger OBDII code P0698 in a 2016 GMC Sierra?

While a faulty sensor may not directly trigger OBDII code P0698 in a 2016 GMC Sierra, it can contribute to issues within the 5V reference circuit, leading to a low voltage condition and the setting of the fault code.

8. How long does it typically take to repair OBDII code P0698 in a 2016 GMC Sierra?

The repair time for OBDII code P0698 in a 2016 GMC Sierra can vary based on the complexity of the issue and the availability of parts. It may take a few hours to a day for a professional mechanic to diagnose and repair the problem.

9. Can resetting the OBDII system clear out the P0698 code in a 2016 GMC Sierra?

Resetting the OBDII system may temporarily clear out the P0698 code in a 2016 GMC Sierra, but if the underlying issue causing the code is not addressed, the code is likely to reappear once the vehicle is driven and the ECM detects the fault again.

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