AutoCodes – GMC – B3794:08 2018 GMC Sierra

B3794:08 2018 GMC Sierra Code - Cruise Control Function Request Circuit

Quick Answer

The Cruise Control Switch is an input to the Body Control Module (BCM). Common causes include Faulty Cruise Control Switch, Cruise Control Switch harness is open or shorted, Cruise Control Switch 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: B3794:08 2018 GMC Sierra indicates Cruise Control Function Request Circuit.
Common causes: Common causes include Faulty Cruise Control Switch, Cruise Control Switch harness is open or shorted, Cruise Control Switch 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 166

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 Mar 25, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B3794:08 2018 GMC Sierra Description

The Cruise Control Switch is an input to the Body Control Module (BCM). The BCM monitors the cruise control on/off, set/coast, resume/accelerate and cancel switches via the cruise control switch signal circuit in order to detect when the driver has requested to perform a cruise control function. The BCM detects a specific voltage signal on the cruise control switch signal circuit when a switch is applied. The Engine Control Module (ECM) receives the requested cruise control switch function from the BCM via a serial data message. The Diagnostic Trouble Code (DTC) will be set when the BCM detects an invalid voltage signal on the cruise control switch signal circuit for 1 second.

OBDII Code B3794:08 2018 GMC Sierra - Cruise Control Function Request Circuit - AutoCodes.com — B3794:08 2018 GMC Sierra Code - Cruise Control Function Request Circuit

What does this mean?

What are the Possible Causes of the DTC B3794:08 2018 GMC Sierra?

Faulty Cruise Control Switch
Cruise Control Switch harness is open or shorted
Cruise Control Switch circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B3794:08 2018 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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B3794:08 2018 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 B3794:08 2018 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 B3794:08 2018 GMC Sierra Code

1. What does OBDII code B3794:08 on a 2018 GMC Sierra mean?

The code B3794:08 indicates a Cruise Control Function Request Circuit issue on the vehicle.

2. What are the common symptoms of a Cruise Control Function Request Circuit problem?

Common symptoms include the cruise control not working, the cruise control light staying on, or the vehicle not maintaining a set speed.

3. What can cause the Cruise Control Function Request Circuit issue on a 2018 GMC Sierra?

Possible causes can include a faulty cruise control switch, damaged wiring harness, a blown fuse, or a malfunctioning cruise control module.

4. How can I diagnose the Cruise Control Function Request Circuit problem?

Diagnosing the issue may involve checking the cruise control system's wiring, inspecting the cruise control switch functionality, and using a diagnostic scanner to read the trouble codes.

5. Is it safe to continue driving with the B3794:08 code triggered?

While the vehicle is generally safe to drive with this code, it is recommended to address the issue promptly to ensure the proper functioning of the cruise control system.

6. How can I repair the Cruise Control Function Request Circuit problem?

Repair steps may involve replacing a faulty cruise control switch, repairing damaged wiring, checking and replacing fuses if necessary, or recalibrating the cruise control system.

7. Can a DIY enthusiast fix the B3794:08 code issue?

Depending on your skill level and access to tools, some DIY enthusiasts may be able to diagnose and repair simple Cruise Control Function Request Circuit problems like checking and replacing fuses or inspecting wiring connections.

8. Should I reset the OBDII code B3794:08 after repairing the issue?

After addressing the problem causing the code, it is recommended to clear the code using an OBDII scanner to reset the system and ensure the repair was successful.

9. How much does it cost to repair a Cruise Control Function Request Circuit issue?

The cost of repairing the B3794:08 code can vary depending on the specific problem, parts needed, and labor rates. It's best to consult a mechanic for an accurate estimate.

10. Can a faulty Cruise Control Function Request Circuit impact other vehicle systems?

While the issue mainly affects the cruise control system, a malfunctioning circuit can sometimes cause related electrical problems or potentially impact other vehicle functions.