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AutoCodes - Generic - B3654

B3654 Code - Electrical Power Take Off Control Switch Circuit

- Code Popularity: 606 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC B3654?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • 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)
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How to Fix the DTC B3654?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B3654 code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

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

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Information for Specific Makes

  • B3654 Buick Electrical Power Take Off Control Switch Circuit
  • B3654 Cadillac Electrical Power Take Off Control Switch Circuit
  • B3654 Chevrolet Electrical Power Take Off Control Switch Circuit
  • B3654 GMC Electrical Power Take Off Control Switch Circuit

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Code B3654 comments

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