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B138A Buick Code - Control Module Voltage Reference Output Circuit

- Code Popularity: 692 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC B138A Buick?

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 Rear Parking Assist Alarm Sensor
  • Rear Parking Assist Alarm Sensor harness is open or shorted
  • Rear Parking Assist Alarm Sensor circuit poor electrical connection
  • Faulty Parking Assist Control Module
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How to Fix the DTC B138A Buick?

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.

Code Tech Notes

DTC B138A 03: Control Module Voltage Reference Output Circuit Low Voltage
DTC B138A 07: Control Module Voltage Reference Output Circuit High Voltage

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B138A Buick 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 B138A Buick Description

The object sensors are 3-wire sensors that are used to determine the distance between the vehicle and an object of interest. The Parking Assist Control Module supplies 8 V to the object sensors via the 8 V reference circuit and provides ground via the low reference circuit. The Parking Assist Control Module triggers the sensors in a sequential loop. After each sensor transmits, the Parking Assist Control Module uses the sensor echo received through the signal circuit to calculate the distance and position of an object.

OBDII Code B138A Buick - Control Module Voltage Reference Output Circuit - AutoCodes.com
B138A Buick Code - Control Module Voltage Reference Output Circuit

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Code B138A Buick comments

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