AutoCodes – GMC – B3604 2015 GMC Sierra

B3604 2015 GMC Sierra Code - Adjustable Pedal Forward 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: B3604 2015 GMC Sierra indicates Adjustable Pedal Forward 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 143

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 B3604 2015 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 short to ground in the forward signal circuit for greater than 60 s.

OBDII Code B3604 2015 GMC Sierra - Adjustable Pedal Forward Switch Circuit Protection Time-Out - AutoCodes.com — B3604 2015 GMC Sierra Code - Adjustable Pedal Forward Switch Circuit Protection Time-Out

What does this mean?

What are the Possible Causes of the DTC B3604 2015 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 B3604 2015 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 B3604 2015 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 B3604 2015 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 B3604 2015 GMC Sierra Code

1. What does the OBDII code B3604 mean on a 2015 GMC Sierra?

B3604 indicates an issue with the Adjustable Pedal Forward Switch Circuit, specifically a protection time-out error caused by excessive current or a malfunction in the circuit.

2. What are the common symptoms of code B3604 in a 2015 GMC Sierra?

Symptoms may include non-responsive adjustable pedals, a warning light on the dashboard, or intermittent functionality of the pedal adjustment feature.

3. What causes the B3604 code to appear in a 2015 GMC Sierra?

The most common causes are a faulty adjustable pedal switch, wiring issues like shorts or open circuits, or a failure in the pedal motor assembly.

4. Can a blown fuse cause the B3604 code in my GMC Sierra?

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

5. How can I diagnose the B3604 code on my 2015 GMC Sierra?

Start by checking the pedal adjustment switch for damage, inspect wiring and connectors for wear or corrosion, and test the pedal motor for proper operation.

6. Is it safe to drive with the B3604 code active on my GMC Sierra?

Yes, the vehicle is generally safe to drive, but the adjustable pedal feature may not function until the issue is resolved.

7. How do I fix the B3604 code on my 2015 GMC Sierra?

Repairs may include replacing the faulty pedal adjustment switch, repairing damaged wiring or connectors, or replacing the pedal motor if necessary.

8. Can a software issue cause the B3604 code?

While rare, a software glitch in the body control module (BCM) could potentially cause this code. A BCM reset or reprogramming may be needed in such cases.

9. What tools are needed to fix the B3604 code?

Basic tools like a multimeter for electrical testing, a scan tool to clear the code, and possibly replacement parts like the pedal switch or motor are needed.

10. Will clearing the B3604 code solve the problem permanently?

No, clearing the code will only reset the warning temporarily. The underlying issue must be identified and repaired to prevent the code from returning.