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Engine-Codes – GMC – P0697 2018 GMC Sierra

P0697 2018 GMC Sierra Code - 5 Volt Reference 3 Circuit

Quick Answer

The P0697 code in a 2018 GMC Sierra indicates a problem with the 5-volt reference circuit 3. Common causes include Short circuit in the wiring harness, Open circuit in the wiring harness, High resistance in the wiring harness or connectors. 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
P0697 2018 GMC Sierra indicates 5 Volt Reference 3 Circuit.
Common causes
Common causes include Short circuit in the wiring harness, Open circuit in the wiring harness, High resistance in the wiring harness or connectors.
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 16, 2024
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Code P0697 2018 GMC Sierra Description

The P0697 code in a 2018 GMC Sierra indicates a problem with the 5-volt reference circuit 3. In modern vehicles, the Engine Control Module (ECM) provides 5-volt reference signals to various sensors throughout the vehicle. These sensors use the 5-volt reference signal to provide information to the ECM, which is crucial for proper engine performance and emissions control.

OBDII Code P0697 2018 GMC Sierra - 5 Volt Reference 3 Circuit
P0697 2018 GMC Sierra Code - 5 Volt Reference 3 Circuit

Common Causes of P0697 2018 GMC Sierra

  1. Short circuit in the wiring harness
  2. Open circuit in the wiring harness
  3. High resistance in the wiring harness or connectors
  4. Faulty sensor connected to the 5-volt reference circuit 3
  5. ECM malfunction

Symptoms of P0697 2018 GMC Sierra

  1. Check Engine Light illuminated
  2. Rough idling
  3. Stalling
  4. Decreased fuel efficiency
  5. Engine misfires

How to Fix P0697 2018 GMC Sierra

  1. Begin by using a diagnostic scanner to confirm the P0697 code and identify the specific sensor or wiring causing the issue.
  2. Inspect the wiring harness and connectors associated with the 5-volt reference circuit 3 for any visible damage, corrosion, or loose connections. Repair or replace as needed.
  3. Test the sensors connected to the 5-volt reference circuit 3 to determine if any are faulty. Replace any faulty sensors.
  4. Clear the code from the ECM's memory using the diagnostic scanner and test drive the vehicle to ensure the issue has been resolved.
  5. If the problem persists, further diagnostics may be needed to pinpoint the exact cause, such as testing the ECM itself for malfunctions.

Cost to Fix P0697 2018 GMC Sierra

The cost of repairing a P0697 code in a 2018 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, while labor costs can range from $100 to $300. Overall, the total repair cost could be anywhere from $150 to $500. It's important to note that labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate.

What does this mean?

Tech Notes for P0697 2018 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.

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