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Engine-Codes – GMC – B3794:08 2016 GMC Sierra

B3794:08 2016 GMC Sierra Code - Cruise Control Function Request Circuit

Quick Answer

The B3794:08 diagnostic trouble code (DTC) specifically relates to the Cruise Control Function Request Circuit in a 2016 GMC Sierra. Common causes include Faulty cruise control switch, Damaged wiring or connectors in the cruise control circuit, Malfunctioning electronic control module (ECM). 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
B3794:08 2016 GMC Sierra indicates Cruise Control Function Request Circuit.
Common causes
Common causes include Faulty cruise control switch, Damaged wiring or connectors in the cruise control circuit, Malfunctioning electronic control module (ECM).
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 18, 2024
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Code B3794:08 2016 GMC Sierra Description

The B3794:08 diagnostic trouble code (DTC) specifically relates to the Cruise Control Function Request Circuit in a 2016 GMC Sierra. This code indicates that there is a malfunction in the circuit responsible for transmitting signals from the cruise control system to the vehicle's electronic control module (ECM). The cruise control system allows the driver to set a desired speed for the vehicle to maintain automatically, providing convenience and reducing driver fatigue on long journeys.

OBDII Code B3794:08 2016 GMC Sierra - Cruise Control Function Request Circuit
B3794:08 2016 GMC Sierra Code - Cruise Control Function Request Circuit

Common Causes of B3794:08 2016 GMC Sierra

  1. Faulty cruise control switch.
  2. Damaged wiring or connectors in the cruise control circuit.
  3. Malfunctioning electronic control module (ECM).
  4. Software glitch in the vehicle's control systems.
  5. Electrical interference or short circuits affecting the cruise control function request circuit.

Symptoms of B3794:08 2016 GMC Sierra

  1. Inability to set or maintain a consistent speed using the cruise control system.
  2. Cruise control system not engaging or disengaging properly.
  3. Dashboard warning light related to cruise control system illuminating.
  4. Erratic behavior of the vehicle's speed when cruise control is activated.
  5. Loss of cruise control functionality altogether.

How to Fix B3794:08 2016 GMC Sierra

  1. Begin by conducting a thorough inspection of the cruise control system wiring and connectors to check for any visible damage or corrosion. Repair or replace any damaged components.
  2. Test the cruise control switch for proper functionality. Replace the switch if it is found to be faulty.
  3. Use a diagnostic scan tool to check for any stored trouble codes in the ECM related to the cruise control system. Clear any codes and retest the system.
  4. If the issue persists, further diagnostic testing may be required to pinpoint the exact cause of the malfunction, such as testing the ECM for proper communication with the cruise control system.
  5. Once the root cause is identified, repair or replace the faulty components as necessary to restore proper function to the cruise control system.

Cost to Fix B3794:08 2016 GMC Sierra

The typical repair costs for addressing the B3794:08 Cruise Control Function Request Circuit code in a 2016 GMC Sierra can vary depending on the specific cause of the issue. In general, parts such as a cruise control switch or wiring harness may cost between $50 to $200, while labor rates at auto repair shops typically range from $80 to $150 per hour. Therefore, the total repair cost could range from $150 to $500 or more, depending on the extent of the repairs needed. It's advisable to consult with a qualified mechanic or dealership for a more accurate estimate based on the specific diagnosis and repair requirements for your vehicle.

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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 B3794:08 2016 GMC Sierra Code

1. What does OBDII code B3794:08 on a 2016 GMC Sierra mean?

This code refers to a Cruise Control Function Request Circuit issue.

2. What are the common symptoms of OBDII code B3794:08 in a 2016 GMC Sierra?

Common symptoms include the cruise control system not engaging or functioning properly.

3. What are the possible causes of OBDII code B3794:08 in a 2016 GMC Sierra?

Potential causes may include a faulty cruise control switch, damaged wiring, or a malfunctioning cruise control module.

4. How can I diagnose the Cruise Control Function Request Circuit issue in my 2016 GMC Sierra?

Diagnosis involves checking the cruise control system components, inspecting wiring for damage, and using a scan tool to retrieve the specific error code.

5. Can I still drive my 2016 GMC Sierra with OBDII code B3794:08 present?

It is generally safe to drive the vehicle with this code, but the cruise control function may not work until the issue is resolved.

6. How can I repair OBDII code B3794:08 on my 2016 GMC Sierra?

Repair options include replacing a faulty cruise control switch, repairing damaged wiring, or replacing the cruise control module if necessary.

7. Is it possible to reset OBDII code B3794:08 on a 2016 GMC Sierra without fixing the issue?

Clearing the code without addressing the underlying problem may result in the code reappearing once the system is activated again.

8. Can a DIY enthusiast fix the Cruise Control Function Request Circuit problem in a 2016 GMC Sierra?

Depending on the individual's skill level and access to tools, some DIY enthusiasts may be able to diagnose and repair this issue themselves.

9. How much does it typically cost to repair OBDII code B3794:08 on a 2016 GMC Sierra?

Costs can vary based on the specific cause of the issue and labor rates, but replacing a cruise control switch or repairing wiring may be relatively affordable.

10. Will fixing OBDII code B3794:08 on my 2016 GMC Sierra improve fuel efficiency or performance?

Resolving this specific code is unlikely to have a direct impact on fuel efficiency or performance, as it primarily relates to the cruise control system functionality.

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