AutoCodes – GMC – P0698 2014 GMC Sierra

P0698 2014 GMC Sierra Code - 5V Reference 3 Circuit Low Voltage

Quick Answer

The Engine Control Module (ECM) has four (4) internal 5 Volt reference circuits (Some models have two (2) internal 5 Volt reference circuits). Common causes include Faulty Sensor on 5 Volt circuit, Sensor on 5 Volt circuit harness is open or shorted, Sensor on 5 Volt circuit poor electrical connection. 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 2014 GMC Sierra indicates 5V Reference 3 Circuit Low Voltage.
Common causes: Common causes include Faulty Sensor on 5 Volt circuit, Sensor on 5 Volt circuit harness is open or shorted, Sensor on 5 Volt circuit poor electrical connection.
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 Popularity 295

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 17, 2022

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0698 2014 GMC Sierra Description

The Engine Control Module (ECM) has four (4) internal 5 Volt reference circuits (Some models have two (2) internal 5 Volt reference circuits). Each internal reference circuit provides external 5 Volt reference circuits for more than one sensor. A short to ground or short to voltage on one external 5 Volt reference circuit can affect all the components connected to the same internal 5 Volt reference circuit. The Diagnostic Trouble Code (DTC) will be set when the ECM detects a lower than the expected voltage on any of the 5 Volt reference circuits for greater than 0.5 s.

OBDII Code P0698 2014 GMC Sierra - 5V Reference 3 Circuit Low Voltage - AutoCodes.com — P0698 2014 GMC Sierra Code - 5V Reference 3 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0698 2014 GMC Sierra?

Faulty Sensor on 5 Volt circuit
Sensor on 5 Volt circuit harness is open or shorted
Sensor on 5 Volt circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0698 2014 GMC Sierra?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

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

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0698 2014 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0698 2014 GMC Sierra code?

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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 2014 GMC Sierra Code

1. What does the OBDII code P0698 mean on a 2014 GMC Sierra?

P0698 indicates a "5V Reference 3 Circuit Low Voltage," meaning the vehicle's ECM has detected a low voltage condition in the 5V reference circuit.

2. What are common symptoms of the P0698 code on a 2014 GMC Sierra?

Symptoms may include the check engine light turning on, erratic sensor readings, poor engine performance, or failure of certain systems like the transmission or fuel system to operate correctly.

3. What causes the P0698 code to appear on a GMC Sierra?

Common causes include a damaged or shorted 5V reference circuit, faulty sensors connected to the circuit, a failing ECM, or corroded or loose electrical connections.

4. Which sensors rely on the 5V reference circuit in a 2014 GMC Sierra?

Sensors that commonly use the 5V reference circuit include the throttle position sensor (TPS), manifold absolute pressure (MAP) sensor, and fuel rail pressure sensor.

5. Can a bad ECM cause the P0698 code?

Yes, a malfunctioning ECM can cause the P0698 code if it fails to provide a stable 5V reference signal to the sensors.

6. How do you diagnose the P0698 code on a 2014 GMC Sierra?

Diagnosis involves checking the 5V reference circuit for proper voltage using a multimeter, inspecting the wiring and connectors for damage, and testing the connected sensors for faults.

7. What repairs can fix the P0698 code on a GMC Sierra?

Repairs may include fixing or replacing damaged wiring or connectors, replacing a faulty sensor, or in rare cases, replacing the ECM if it is found to be defective.

8. Can I drive my 2014 GMC Sierra with the P0698 code?

Driving with the P0698 code is not recommended, as it can cause erratic engine performance or damage other systems if the underlying issue is not addressed.

9. How much does it cost to fix the P0698 code on a GMC Sierra?

Repair costs vary, but fixing wiring issues might cost $100-$300, while replacing a sensor or ECM could range from $200 to over $1,000 depending on parts and labor.

10. Can a dead battery or low voltage trigger the P0698 code?

Yes, a weak or dead battery or a charging system issue can sometimes affect the 5V reference circuit and trigger the P0698 code.