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B3655 Buick Code - Electrical Power Take Off Control Switch Circuit Low

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
B3655 Buick indicates Electrical Power Take Off Control Switch Circuit Low.
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 416
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Mar 09, 2020
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Code B3655 Buick 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 B3655 Buick - Electrical Power Take Off Control Switch Circuit Low - AutoCodes.com
B3655 Buick Code - Electrical Power Take Off Control Switch Circuit Low
What does this mean?

What are the Possible Causes of the DTC B3655 Buick?

  • 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 B3655 Buick?

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 B3655 Buick 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 B3655 Buick Code

1. What does the OBDII code B3655 mean on a Buick?

B3655 indicates an issue with the Electrical Power Take Off (PTO) Control Switch Circuit, specifically a low voltage condition.

2. What are common symptoms of code B3655 on a Buick?

Symptoms may include the PTO system not functioning, warning lights on the dashboard, and possible loss of auxiliary power accessories.

3. What causes the B3655 code to appear?

Common causes include a faulty PTO control switch, damaged wiring or connectors in the circuit, or a failing control module.

4. Can a damaged PTO control switch cause the B3655 code?

Yes, a damaged or malfunctioning PTO control switch is a primary cause of this code.

5. How can I diagnose the B3655 code on my Buick?

Inspect the PTO control switch, check for damaged wiring or loose connections, and use a multimeter to test voltage levels in the circuit.

6. Is it safe to drive with the B3655 code active?

While the vehicle may be drivable, the PTO system may not function properly, which could affect any auxiliary equipment relying on it.

7. How do I fix the B3655 code on a Buick?

Repairs may involve replacing the PTO control switch, repairing or replacing damaged wiring, or reprogramming the control module if necessary.

8. Can a blown fuse trigger the B3655 code?

Yes, a blown fuse in the PTO circuit can result in low voltage and trigger the B3655 code.

9. How much does it cost to repair the B3655 code on a Buick?

Repair costs vary but might range from $50 to $300 depending on whether the issue is with the switch, wiring, or module.

10. Can clearing the B3655 code fix the issue?

Clearing the code without addressing the root cause will not fix the problem, and the code is likely to return.

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