AutoCodes – GMC – B3654 GMC

B3654 GMC Code - Electrical Power Take Off Control Switch Circuit

Quick Answer

The Auxiliary Power Outlet (APO) Switch controls the operation of the Hybrid Control Module (HCM) APO state manager. Common causes include Faulty Auxiliary Power Outlet (APO) Switch, Auxiliary Power Outlet (APO) Switch harness is open or shorted, Auxiliary Power Outlet (APO) 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: B3654 GMC indicates Electrical Power Take Off Control Switch Circuit.
Common causes: Common causes include Faulty Auxiliary Power Outlet (APO) Switch, Auxiliary Power Outlet (APO) Switch harness is open or shorted, Auxiliary Power Outlet (APO) 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 429

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Mar 09, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B3654 GMC Description

The Auxiliary Power Outlet (APO) Switch controls the operation of the Hybrid Control Module (HCM) APO state manager. The APO state manager commands one of three states from the Starter Generator Control Module (SGCM) (APO Off, APO Normal, APO Continuous). The APO switch is a momentary button, its output signal an input to an HCM analogue channel. Five volts are supplied to the switch and the returned voltage is measured relative to HCM signal ground to determine the switch state. A resistor network in the switch circuitry ensures that shorted high and low states can be diagnosed successfully. There are 2 valid voltage ranges of the return signal, one representing switch open, the other representing switch closed. If the voltage is lower than a threshold, a short low is indicated. Similarly, if the voltage is greater than the short high threshold, a short 'high' is indicated. The Diagnostic Trouble Code (DTC) sets if voltage is lower than a calibrated value, a short low is indicated or if the voltage is greater than a calibrated value the short high is indicated.

OBDII Code B3654 GMC - Electrical Power Take Off Control Switch Circuit - AutoCodes.com — B3654 GMC Code - Electrical Power Take Off Control Switch Circuit

What does this mean?

What are the Possible Causes of the DTC B3654 GMC?

Faulty Auxiliary Power Outlet (APO) Switch
Auxiliary Power Outlet (APO) Switch harness is open or shorted
Auxiliary Power Outlet (APO) Switch circuit poor electrical connection
Faulty Hybrid Control Module (HCM)

How to Fix the DTC B3654 GMC?

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 B3654 GMC 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.

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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 B3654 GMC Code

1. What are the common symptoms of OBDII code B3654 GMC?

The common symptoms of code B3654 GMC include the power take off (PTO) system not engaging or disengaging properly, illuminated warning lights on the dashboard, and loss of functionality of the PTO control switch.

2. What are the possible causes of OBDII code B3654 GMC?

Possible causes of code B3654 GMC include a faulty PTO control switch, damaged wiring or connectors in the PTO control circuit, a malfunctioning PTO module, or a problem with the PTO engagement mechanism.

3. How can I diagnose OBDII code B3654 GMC?

Diagnosing code B3654 GMC involves using a diagnostic scanner to retrieve the fault code, inspecting the PTO control switch and related wiring for damage, testing the PTO module for proper functionality, and checking the PTO engagement mechanism for any issues.

4. Can I continue driving my vehicle with OBDII code B3654 GMC?

It is not recommended to continue driving your vehicle with code B3654 GMC present, as it can lead to further damage to the PTO system and potentially affect the drivability of your vehicle.

5. How can I repair OBDII code B3654 GMC?

Repairing code B3654 GMC may involve replacing the faulty PTO control switch, repairing or replacing damaged wiring or connectors in the PTO control circuit, troubleshooting and repairing issues with the PTO module, or addressing any problems with the PTO engagement mechanism.

6. Are there any DIY tips for fixing OBDII code B3654 GMC?

DIY tips for fixing code B3654 GMC include carefully inspecting the PTO control switch and wiring for visible damage, checking fuse connections related to the PTO system, and consulting the vehicle's service manual for specific troubleshooting steps.

7. How much does it cost to repair OBDII code B3654 GMC?

The cost of repairing code B3654 GMC can vary depending on the specific cause of the issue, the extent of the damage, and whether you choose to do the repairs yourself or take your vehicle to a professional mechanic. Costs may range from a few hundred dollars to over a thousand dollars.

8. Can a faulty PTO control switch cause OBDII code B3654 GMC?

Yes, a faulty PTO control switch is a common cause of OBDII code B3654 GMC, as it can prevent proper engagement and disengagement of the power take off system, leading to the code being triggered.

9. How long does it take to repair OBDII code B3654 GMC?

The repair time for code B3654 GMC can vary depending on the specific cause of the issue, the availability of replacement parts, and your level of experience with automotive repairs. It may take anywhere from a few hours to a full day to complete the repairs.

10. Can OBDII code B3654 GMC be intermittent?

Yes, OBDII code B3654 GMC can be intermittent, meaning that the issue may come and go sporadically. It is important to address the underlying cause of the code even if it is intermittent to prevent further problems with the PTO system.