P0698 2018 GMC Sierra Code - 5V Reference 3 Circuit Low Voltage
Quick Answer
The P0698 diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates that the 5V reference 3 circuit is experiencing low voltage. Common causes include Faulty Sensor: A malfunctioning sensor connected to the 5V reference 3 circuit, such as the throttle position sensor or manifold absolute pressure sensor, could be causing the low voltage issue, Wiring or Connector Issues: Damaged or corroded wiring, connectors, or harnesses related to the 5V reference 3 circuit can disrupt the voltage supply, ECM Malfunction: A problem with the Engine Control Module (ECM) itself, such as a damaged circuit board or internal fault, could be causing the low voltage condition. 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 2018 GMC Sierra indicates 5V Reference 3 Circuit Low Voltage.
- Common causes
- Common causes include Faulty Sensor: A malfunctioning sensor connected to the 5V reference 3 circuit, such as the throttle position sensor or manifold absolute pressure sensor, could be causing the low voltage issue, Wiring or Connector Issues: Damaged or corroded wiring, connectors, or harnesses related to the 5V reference 3 circuit can disrupt the voltage supply, ECM Malfunction: A problem with the Engine Control Module (ECM) itself, such as a damaged circuit board or internal fault, could be causing the low voltage condition.
- 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 P0698 2018 GMC Sierra Description
The P0698 diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates that the 5V reference 3 circuit is experiencing low voltage. In modern vehicles, there are multiple reference voltage circuits that provide stable voltage levels for various sensors and components within the vehicle's electronic control system. The 5V reference 3 circuit typically supplies a 5-volt reference voltage to sensors such as the throttle position sensor, manifold absolute pressure sensor, and others.
Common Causes of P0698 2018 GMC Sierra
- Faulty Sensor: A malfunctioning sensor connected to the 5V reference 3 circuit, such as the throttle position sensor or manifold absolute pressure sensor, could be causing the low voltage issue.
- Wiring or Connector Issues: Damaged or corroded wiring, connectors, or harnesses related to the 5V reference 3 circuit can disrupt the voltage supply.
- ECM Malfunction: A problem with the Engine Control Module (ECM) itself, such as a damaged circuit board or internal fault, could be causing the low voltage condition.
- Short Circuit: A short circuit in the 5V reference 3 circuit can cause voltage fluctuations and trigger the P0698 code.
- Power Supply Issue: A problem with the vehicle's power supply, such as a weak battery or alternator, may not be providing sufficient voltage to the 5V reference 3 circuit.
Symptoms of P0698 2018 GMC Sierra
- 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.
- Reduced Engine Performance: The vehicle may experience a decrease in engine power, hesitation, or rough idling due to inaccurate sensor readings.
- Poor Fuel Efficiency: A malfunction in the 5V reference 3 circuit can lead to improper fuel delivery, resulting in reduced fuel efficiency.
- Stalling: In severe cases, the vehicle may stall or have difficulty starting due to incorrect sensor data affecting engine operation.
How to Fix P0698 2018 GMC Sierra
- Diagnose the Issue: Use a diagnostic scanner to retrieve the trouble code and perform further testing to pinpoint the exact cause of the low voltage condition.
- Inspect Wiring and Connectors: Check the wiring, connectors, and harnesses related to the 5V reference 3 circuit for any damage, corrosion, or loose connections. Repair or replace as needed.
- Test Sensors: Test the sensors connected to the 5V reference 3 circuit to ensure they are functioning correctly. Replace any faulty sensors.
- Check ECM: Inspect the Engine Control Module (ECM) for any signs of damage or malfunction. If necessary, have the ECM repaired or replaced.
- Clear Codes and Test Drive: Clear the trouble code from the ECM memory, reset the system, and test drive the vehicle to verify that the issue has been resolved.
Cost to Fix P0698 2018 GMC Sierra
The typical repair costs for addressing a P0698 code on a 2018 GMC Sierra can vary depending on the specific cause of the issue. In general, the cost of parts such as sensors, wiring, or connectors may range from $50 to $200. Labor costs at auto repair shops can vary between $80 and $150 per hour, with the total repair time likely to be around 1-2 hours for diagnosis and repair. Therefore, the total cost of resolving a P0698 code could range from $150 to $450, excluding any additional diagnostic fees or taxes. It's recommended to consult with a certified mechanic or repair shop for a more accurate cost estimate based on your location and vehicle specifications.
Tech Notes for P0698 2018 GMC Sierra
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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Frequently Asked Questions about P0698 2018 GMC Sierra Code
1. What are the common symptoms of OBDII code P0698 in a 2018 GMC Sierra?
- Common symptoms include issues with the vehicle's electrical system, such as improper voltage readings or erratic behavior of sensors.
2. What does the OBDII code P0698 for a 2018 GMC Sierra indicate?
- The code P0698 points to a problem with the 5V reference 3 circuit, specifically indicating low voltage.
3. What are the possible causes of OBDII code P0698 in a 2018 GMC Sierra?
- Common causes include a faulty 5V reference circuit, damaged wiring or connectors, a malfunctioning sensor, or issues with the powertrain control module (PCM).
4. How can I diagnose the issue related to OBDII code P0698 in a 2018 GMC Sierra?
- Diagnosing the problem typically involves checking the wiring and connectors for damage, testing the sensors for proper functionality, and using a multimeter to measure voltage in the circuit.
5. Is it safe to continue driving a 2018 GMC Sierra with OBDII code P0698?
- It is not recommended to drive the vehicle with this code present, as it can lead to further electrical issues and potential damage to other components.
6. What are some repair tips for fixing OBDII code P0698 in a 2018 GMC Sierra?
- Repair tips may include checking and repairing any damaged wiring, replacing faulty sensors or connectors, and resetting the PCM after addressing the underlying issue.
7. Can a DIY enthusiast fix OBDII code P0698 in a 2018 GMC Sierra?
- While some aspects of diagnosing and repairing this code may be tackled by a DIY enthusiast, professional help may be needed for more complex issues or if the underlying cause is not easily identifiable.
8. How much does it typically cost to repair OBDII code P0698 in a 2018 GMC Sierra?
- Repair costs can vary depending on the exact cause of the issue, but it may range from a simple fix like replacing a sensor to a more involved repair involving the PCM or wiring.
9. Will resetting the OBDII code P0698 in a 2018 GMC Sierra make the problem go away?
- Simply resetting the code may temporarily clear the error, but if the underlying issue is not addressed, the code is likely to reappear once the problem persists.
10. How can I prevent OBDII code P0698 from occurring in my 2018 GMC Sierra in the future?
- Regular vehicle maintenance, checking for loose connections, and addressing electrical issues promptly can help prevent the recurrence of OBDII code P0698 in the future.
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