AutoCodes – GMC – B3605 2018 GMC Sierra

B3605 2018 GMC Sierra Code - Adjustable Pedal Rearward Switch Circuit Protection Time-Out

Quick Answer

Ground is supplied at all times to the adjustable pedal switch. Common causes include Faulty Adjustable Pedal Forward Switch, Adjustable Pedal Forward Switch harness is open or shorted, Adjustable Pedal Forward 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: B3605 2018 GMC Sierra indicates Adjustable Pedal Rearward Switch Circuit Protection Time-Out.
Common causes: Common causes include Faulty Adjustable Pedal Forward Switch, Adjustable Pedal Forward Switch harness is open or shorted, Adjustable Pedal Forward 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 144

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 Jun 14, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B3605 2018 GMC Sierra Description

Ground is supplied at all times to the adjustable pedal switch. The adjustable pedal forward and rearward switches are inputs to the seat memory control module. When the switch is operated to the forward or rearward direction, it supplies a ground path for the signal inputs from the seat memory control module. The seat memory control module then commands the adjustable pedals motor to move in response to the switch signal. The Diagnostic Trouble Code (DTC) will be set when the seat memory control module detects a short to ground in the rearward signal circuit for greater than 60 s.

OBDII Code B3605 2018 GMC Sierra - Adjustable Pedal Rearward Switch Circuit Protection Time-Out - AutoCodes.com — B3605 2018 GMC Sierra Code - Adjustable Pedal Rearward Switch Circuit Protection Time-Out

What does this mean?

What are the Possible Causes of the DTC B3605 2018 GMC Sierra?

Faulty Adjustable Pedal Forward Switch
Adjustable Pedal Forward Switch harness is open or shorted
Adjustable Pedal Forward Switch circuit poor electrical connection
Faulty Driver Seat Memory Control Module

How to Fix the DTC B3605 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 B3605 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 B3605 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 B3605 2018 GMC Sierra Code

1. What does the OBDII code B3605 mean on a 2018 GMC Sierra?

B3605 indicates an issue with the Adjustable Pedal Rearward Switch Circuit, specifically a protection time-out error.

2. What are common symptoms of the B3605 code?

The adjustable pedals may not move rearward, the switch may be unresponsive, or a warning light might appear on the dashboard.

3. What causes the B3605 code to trigger?

It is often caused by a faulty adjustable pedal switch, a wiring issue, or a short circuit in the pedal adjustment system.

4. Can a blown fuse cause the B3605 code?

Yes, a blown fuse related to the adjustable pedal system can cause this code by interrupting the circuit.

5. How can I diagnose the B3605 code?

Check the adjustable pedal switch for proper function, inspect the wiring and connectors for damage, and test the fuse related to the circuit.

6. Is it safe to drive with the B3605 code?

Yes, but the adjustable pedal feature may not work, which could impact driver comfort and safety depending on your seating position.

7. How do I fix the B3605 code?

Replace the faulty adjustable pedal switch, repair damaged wiring, or replace the fuse if necessary.

8. Can the B3605 code clear itself?

No, the code will not clear itself. The underlying issue must be repaired, and the code should be cleared with an OBDII scanner.

9. How much does it cost to repair the B3605 code?

The cost can vary but typically ranges from $50 to $200 for parts and labor, depending on whether the issue is with the switch, wiring, or fuse.

10. Do I need a professional mechanic to fix the B3605 code?

While minor issues like replacing a fuse can be done by most vehicle owners, diagnosing and repairing wiring or switch problems may require a professional.