AutoCodes – GMC – B3794 2017 GMC Sierra

B3794 2017 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 2017 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 193

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 2017 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 BCM monitors the cruise control switch. The BCM sets the OBDII code when the cruise control switch is not to factory specifications.

OBDII Code B3794 2017 GMC Sierra - Cruise Control Function Request Circuit - AutoCodes.com — B3794 2017 GMC Sierra Code - Cruise Control Function Request Circuit

What does this mean?

What are the Possible Causes of the DTC B3794 2017 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 2017 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 2017 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 2017 GMC Sierra code?

Need more information on how to fix the B3794 2017 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the 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 2017 GMC Sierra Code

1. What does the OBDII code B3794 mean on a 2017 GMC Sierra?

The B3794 code indicates a malfunction in the cruise control function request circuit. This means there is an issue with the electrical circuit that sends signals from the cruise control switch to the engine control module.

2. What are common symptoms of code B3794 in a 2017 GMC Sierra?

Symptoms may include the cruise control not engaging or disengaging unexpectedly, the cruise control light flashing or not illuminating, and potentially an overall erratic cruise control operation.

3. What can cause the B3794 code to appear on a 2017 GMC Sierra?

Possible causes include a faulty cruise control switch, damaged wiring or connectors in the cruise control circuit, or a problem with the engine control module itself.

4. How is the B3794 code diagnosed in a 2017 GMC Sierra?

Diagnosis involves using a scan tool to read the fault code and examining the cruise control switch and its circuitry for signs of damage or malfunction. This may include visual inspection of wiring and connectors, and testing switch continuity with a multimeter.

5. What are the steps to fix the B3794 code in a 2017 GMC Sierra?

Repairing this code may involve replacing the faulty cruise control switch, repairing or replacing damaged wires or connectors in the cruise control circuit, or in some cases, reprogramming or replacing the engine control module.

6. Is it safe to drive a 2017 GMC Sierra with the B3794 code active?

While it is generally safe to drive, the cruise control may not function properly. If the cruise control is behaving erratically, it could pose a risk. It's advisable to get the system checked and repaired as soon as possible.

7. Will the B3794 code clear itself once the issue is fixed on a 2017 GMC Sierra?

Once the underlying issue is fixed, the code will need to be manually cleared using an OBDII scan tool. However, if all issues are thoroughly addressed, the code should not reappear.

8. How urgent is it to address the B3794 code in a 2017 GMC Sierra?

Although your vehicle can be driven, the malfunctioning cruise control can be inconvenient and potentially unsafe if it engages or disengages unexpectedly. It is moderately urgent to address this issue to ensure all features operate correctly and safely.