P0698 2017 GMC Sierra Code - 5V Reference 3 Circuit Low Voltage
Quick Answer
The P0698 diagnostic trouble code (DTC) indicates a low voltage condition in the 5V reference circuit 3 of the vehicle's electronic control unit (ECU). Common causes include Damaged Wiring or Connectors: Physical damage to the wiring harness or connectors can lead to poor electrical connections and low voltage, Faulty Sensors: A malfunctioning sensor that draws too much current can affect the voltage in the reference circuit, Corrosion: Corrosion at connection points can impede electrical flow, leading to voltage drops. 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 2017 GMC Sierra indicates 5V Reference 3 Circuit Low Voltage.
- Common causes
- Common causes include Damaged Wiring or Connectors: Physical damage to the wiring harness or connectors can lead to poor electrical connections and low voltage, Faulty Sensors: A malfunctioning sensor that draws too much current can affect the voltage in the reference circuit, Corrosion: Corrosion at connection points can impede electrical flow, leading to voltage drops.
- 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 2017 GMC Sierra Description
The P0698 diagnostic trouble code (DTC) indicates a low voltage condition in the 5V reference circuit 3 of the vehicle's electronic control unit (ECU). This circuit is crucial as it provides a stable 5-volt reference voltage to various sensors and components within the vehicle's systems, including the engine control module (ECM), transmission control module (TCM), and various sensors such as throttle position sensors, mass airflow sensors, and others. When the voltage in this circuit drops below the expected threshold, it can lead to erratic sensor readings, causing the ECU to make incorrect adjustments to fuel delivery, ignition timing, and other critical engine parameters.
Common Causes of P0698 2017 GMC Sierra
- Damaged Wiring or Connectors: Physical damage to the wiring harness or connectors can lead to poor electrical connections and low voltage.
- Faulty Sensors: A malfunctioning sensor that draws too much current can affect the voltage in the reference circuit.
- Corrosion: Corrosion at connection points can impede electrical flow, leading to voltage drops.
- PCM Issues: A malfunctioning powertrain control module may fail to provide the correct reference voltage.
- Short Circuits: A short circuit in the wiring can pull down the voltage in the reference circuit, triggering the code.
Symptoms of P0698 2017 GMC Sierra
- Check Engine Light: The illumination of the check engine light on the dashboard is often the first indication of a problem.
- Poor Engine Performance: The vehicle may experience rough idling, hesitation during acceleration, or overall sluggishness.
- Increased Fuel Consumption: Drivers may notice a drop in fuel efficiency due to improper fuel-air mixture adjustments.
- Stalling or No Start Condition: In severe cases, the vehicle may stall unexpectedly or fail to start altogether.
- Erratic Sensor Readings: Instruments may display inconsistent data, such as fluctuating RPMs or inaccurate temperature readings.
How to Fix P0698 2017 GMC Sierra
- Visual Inspection: Begin with a thorough visual inspection of the wiring harness and connectors associated with the 5V reference circuit for signs of damage or corrosion.
- Test Voltage: Use a multimeter to measure the voltage at the 5V reference circuit to confirm the low voltage condition.
- Check Sensors: Test the sensors connected to the circuit to ensure they are functioning correctly and not drawing excessive current.
- Repair or Replace Components: Based on the findings, repair any damaged wiring, clean corroded connectors, or replace faulty sensors as necessary.
- Clear Codes and Test Drive: After repairs, clear the DTCs and take the vehicle for a test drive to ensure the issue is resolved and the check engine light does not reappear.
Cost to Fix P0698 2017 GMC Sierra
The cost to diagnose and repair the P0698 code can vary widely based on the specific issue identified. Typical repair costs may range from $100 to $600, depending on whether simple repairs (like cleaning connectors) or more complex repairs (like replacing sensors or wiring harnesses) are needed. Labor rates at auto repair shops generally range from $80 to $150 per hour. In metropolitan areas or at dealerships, rates may be higher, while independent shops may offer lower rates. It's advisable to check local rates for a more precise estimate, as the total cost will also depend on the time required for diagnosis and repair.
Tech Notes for P0698 2017 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 2017 GMC Sierra Code
1. What does OBDII code P0698 mean on a 2017 GMC Sierra?
P0698 indicates a low voltage issue in the 5-volt reference 3 circuit, which is used to supply power to certain sensors in the vehicle.
2. What are the common symptoms of the P0698 code?
Common symptoms include a check engine light, erratic sensor readings, poor engine performance, or issues with starting the vehicle.
3. What causes the P0698 code to appear?
Possible causes include a short or open circuit in the 5-volt reference wire, a faulty sensor, a damaged ECM, or corroded or loose electrical connections.
4. Can I drive my 2017 GMC Sierra with a P0698 code?
While the vehicle may still run, driving with this code can lead to performance issues and potential damage to other components. Prompt diagnosis and repair are recommended.
5. How is the P0698 code diagnosed?
A mechanic will inspect the wiring and connectors for damage, use a multimeter to check voltage in the 5-volt reference circuit, and test the sensors and ECM for proper operation.
6. Which sensors are affected by the 5-volt reference 3 circuit in the GMC Sierra?
The exact sensors vary by configuration, but they often include the throttle position sensor, MAP sensor, or other engine management sensors.
7. What repairs can fix the P0698 code?
Repairs may include fixing or replacing damaged wiring, cleaning corroded connectors, replacing a faulty sensor, or in rare cases, replacing the ECM.
8. How much does it cost to repair a P0698 code on a 2017 GMC Sierra?
Costs can range from $100 for minor wiring repairs to $800 or more if the ECM needs replacement, depending on labor rates and parts.
9. What tools are needed to diagnose the P0698 code?
Common tools include an OBDII scanner, a digital multimeter, and basic hand tools for inspecting and repairing wiring and connectors.
10. Does clearing the P0698 code fix the problem?
Clearing the code without addressing the underlying issue will not resolve the problem, and the code will likely return. Proper diagnosis and repair are necessary.
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