AutoCodes – GMC – B3604 2018 GMC Sierra

B3604 2018 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 2018 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 177
How popular is this code, among other codes? Low
Table of contents Created and updated by William Orellana on Jun 14, 2023
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Code B3604 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 short to ground in the forward signal circuit for greater than 60 s.
OBDII Code B3604 2018 GMC Sierra - Adjustable Pedal Forward Switch Circuit Protection Time-Out - AutoCodes.com
B3604 2018 GMC Sierra Code - Adjustable Pedal Forward Switch Circuit Protection Time-Out

What are the Possible Causes of the DTC B3604 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 B3604 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 B3604 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 B3604 2018 GMC Sierra code?

Need more information on how to fix the B3604 2018 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B3604 2018 GMC Sierra code diagnosed by a professional: Find a repair shop in your area

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 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code B3604 in a 2018 GMC Sierra?

The common symptoms of code B3604 include the adjustable pedal not moving forward, a non-functional adjustable pedal feature, and a warning light illuminated on the instrument panel.

2. What causes the OBDII code B3604 in a 2018 GMC Sierra?

The code B3604 is triggered when the Adjustable Pedal Forward Switch Circuit Protection Time-Out occurs, typically due to a faulty adjustable pedal forward switch, damaged wiring, or a malfunctioning control module.

3. How can I diagnose the issue related to code B3604 in my 2018 GMC Sierra?

To diagnose the issue, start by checking the wiring harness and connectors for any visible damage. Test the adjustable pedal forward switch for continuity and proper operation using a multimeter. If necessary, consult a professional mechanic for a thorough diagnosis.

4. Can I repair the OBDII code B3604 in my 2018 GMC Sierra myself?

Depending on your experience level, you may be able to repair the code B3604 yourself by replacing the faulty adjustable pedal forward switch or repairing any damaged wiring. However, for more complex issues or if you're unsure, it's recommended to seek professional help.

5. Are there any tips for preventing OBDII code B3604 from recurring in a 2018 GMC Sierra?

To prevent the code from recurring, regularly inspect the adjustable pedal system for any signs of wear or damage. Avoid putting excessive pressure on the adjustable pedal to prolong its lifespan and prevent premature failures.

6. Is it safe to drive my 2018 GMC Sierra with OBDII code B3604 present?

While the vehicle may still be operational with the code present, it's recommended to address the issue promptly to avoid any potential safety hazards or further damage to the adjustable pedal system. Limit driving until the issue is resolved.

7. How much does it typically cost to repair OBDII code B3604 in a 2018 GMC Sierra?

The cost of repairing code B3604 can vary depending on the extent of the issue, the parts needed for replacement, and labor costs. It's advisable to obtain quotes from different mechanics or service centers to compare prices.

8. Can a faulty adjustable pedal forward switch cause other issues in a 2018 GMC Sierra?

Yes, a faulty adjustable pedal forward switch can lead to other issues such as the loss of adjustable pedal functionality, potential electrical problems, and the triggering of additional error codes related to the pedal system.

9. Will disconnecting the battery reset the OBDII code B3604 in a 2018 GMC Sierra?

Disconnecting the battery may reset the code temporarily, but if the underlying issue causing code B3604 is not addressed, the code is likely to reappear once the system is back in operation. It's recommended to diagnose and repair the root cause of the problem.

10. How long does it typically take to repair OBDII code B3604 in a 2018 GMC Sierra?

The repair time for code B3604 can vary depending on the complexity of the issue, the availability of parts, and the expertise of the technician. In general, the repair process may take a few hours to complete, but this can vary.

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