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Engine-Codes – GMC – P0698 GMC

P0698 GMC Code - 5V Reference 3 Circuit Low Voltage

Quick Answer

The P0698 diagnostic trouble code (DTC) for GMC vehicles indicates a problem with the 5V reference 3 circuit, specifically a low voltage condition. Common causes include Wiring harness issues, such as shorts or breaks in the wiring, Faulty 5V reference sensor or component, ECM malfunction. 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 GMC indicates 5V Reference 3 Circuit Low Voltage.
Common causes
Common causes include Wiring harness issues, such as shorts or breaks in the wiring, Faulty 5V reference sensor or component, ECM malfunction.
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 12, 2024
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Code P0698 GMC Description

The P0698 diagnostic trouble code (DTC) for GMC vehicles indicates a problem with the 5V reference 3 circuit, specifically a low voltage condition. In modern vehicles, the Engine Control Module (ECM) provides 5V reference signals to various sensors and components in the vehicle's systems. These reference signals are crucial for the proper operation of these sensors and components, as they rely on a consistent voltage to function accurately.

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

Common Causes of P0698 GMC

  1. Wiring harness issues, such as shorts or breaks in the wiring
  2. Faulty 5V reference sensor or component
  3. ECM malfunction
  4. Corrosion or poor connection at the electrical connectors
  5. Electrical system issues, such as a weak battery or alternator

Symptoms of P0698 GMC

  1. Check engine light illuminated on the dashboard
  2. Reduced engine power or acceleration
  3. Engine stalling or rough idling
  4. Poor fuel economy
  5. Difficulty starting the vehicle

How to Fix P0698 GMC

  1. Begin by using a scan tool to diagnose the specific cause of the P0698 code.
  2. Inspect the wiring harness for any visible damage or corrosion. Repair or replace any damaged wires.
  3. Test the 5V reference sensors and components to identify any faulty parts. Replace as needed.
  4. Check the electrical connectors for corrosion or poor connections. Clean or replace connectors as necessary.
  5. Clear the DTC and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0698 GMC

The cost of repairing a P0698 code can vary depending on the specific cause of the issue. On average, the parts needed for this repair, such as wiring harnesses, sensors, or electrical connectors, can range from $50 to $200. Labor costs at an auto repair shop typically range from $80 to $150 per hour. Overall, the total cost of repairing a P0698 code can range from $150 to $500, depending on the extent of the issue and the parts needed for the repair. It's recommended to consult with a professional mechanic to get an accurate estimate based on the specific circumstances of your vehicle.

What does this mean?

Tech Notes for P0698 GMC

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

Need more information about the P0698 GMC code?

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Information for Specific GMC Models

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 GMC Code

1. What are the common symptoms of OBDII code P0698 GMC (5V Reference 3 Circuit Low Voltage)?

- Common symptoms include engine stalling, rough idling, poor acceleration, and illumination of the Check Engine light.

2. What can cause the OBDII code P0698 GMC to be triggered?

- The code P0698 is typically triggered by a malfunction in the 5V Reference 3 circuit, often caused by wiring issues, a faulty sensor, or a problem with the PCM (Powertrain Control Module).

3. How can I diagnose the OBDII code P0698 GMC?

- Diagnosing the code involves using a scan tool to retrieve the specific fault code, checking the wiring and connectors related to the 5V Reference 3 circuit, and testing the sensor and PCM for proper functioning.

4. What are some repair tips for fixing the OBDII code P0698 GMC?

- Repair tips include inspecting and repairing any damaged wiring or connectors, replacing a faulty sensor if necessary, and reprogramming or replacing the PCM if it is determined to be the cause of the issue.

5. Can I drive my vehicle with the OBDII code P0698 GMC present?

- It is not recommended to drive your vehicle with the code P0698 present, as it can lead to engine performance issues and potentially cause further damage if left unresolved.

6. How much does it typically cost to repair the OBDII code P0698 GMC?

- The cost of repairing the code P0698 can vary depending on the underlying cause. Costs may include labor fees for diagnosis and repairs, as well as the price of any replacement parts needed.

7. Will resetting the Check Engine light clear the OBDII code P0698 GMC?

- Resetting the Check Engine light may temporarily turn it off, but the underlying issue causing the code P0698 will still need to be diagnosed and repaired to prevent the light from coming back on.

8. Is the OBDII code P0698 GMC a common problem in GMC vehicles?

- The code P0698 (5V Reference 3 Circuit Low Voltage) is not as common as some other OBDII codes, but it can still occur in GMC vehicles due to various electrical system issues.

9. Can a DIY enthusiast fix the OBDII code P0698 GMC at home?

- While some DIY enthusiasts may have the skills to diagnose and repair the code P0698, it is recommended to consult a professional mechanic for an accurate diagnosis and proper repair to ensure the issue is resolved correctly.

10. How long does it typically take to repair the OBDII code P0698 GMC?

- The repair time for the code P0698 can vary depending on the exact cause of the issue and the extent of repairs needed. It can range from a quick fix to a more involved repair requiring additional time.

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