B138A GMC Code - Control Module Voltage Reference Output Circuit
Quick Answer
The object sensors are 3-wire sensors that are used to determine the distance between the vehicle and an object of interest. Common causes include 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. 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
- B138A GMC indicates Control Module Voltage Reference Output Circuit.
- Common causes
- Common causes include 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.
- 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.
Code B138A GMC Description
What are the Possible Causes of the DTC B138A GMC?
- 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
How to Fix the DTC B138A 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.
Code Tech Notes
DTC B138A 07: Control Module Voltage Reference Output Circuit High Voltage
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B138A 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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Frequently Asked Questions about B138A GMC Code
1. What are the common symptoms of OBDII code B138A GMC?
The common symptoms of OBDII code B138A GMC include issues with the vehicle's electrical system, such as dimming or flickering lights, erratic instrument cluster behavior, and difficulty starting the engine.
2. What causes the OBDII code B138A GMC to trigger?
The OBDII code B138A GMC is typically triggered when there is a malfunction in the control module voltage reference output circuit, which may be due to a faulty control module, wiring issues, or a failed voltage regulator.
3. How can I diagnose the OBDII code B138A GMC?
Diagnosing the OBDII code B138A GMC involves using a diagnostic scanner to retrieve the trouble codes, conducting a visual inspection of the wiring and connectors, testing the control module voltage output, and checking for any related technical service bulletins from the manufacturer.
4. Can I still drive my vehicle with the OBDII code B138A GMC?
It is not recommended to drive your vehicle with the OBDII code B138A GMC present, as it indicates a potential issue with the control module voltage reference output circuit that could lead to further electrical problems or engine issues.
5. How can I repair the OBDII code B138A GMC?
To repair the OBDII code B138A GMC, you may need to replace the faulty control module, repair any damaged wiring or connectors, or address any issues with the voltage regulator. It is recommended to consult a professional mechanic for an accurate diagnosis and repair.
6. Is the OBDII code B138A GMC a serious issue?
The OBDII code B138A GMC should be addressed promptly to prevent further damage to the vehicle's electrical system or control modules. Ignoring the code could lead to more severe problems and potential safety hazards.
7. Can a DIY enthusiast fix the OBDII code B138A GMC?
While some DIY enthusiasts may have the skills to diagnose and repair the OBDII code B138A GMC, it is recommended to seek professional help to ensure the issue is properly diagnosed and fixed, especially when dealing with complex control module circuits.
8. Are there any common mistakes to avoid when dealing with the OBDII code B138A GMC?
Common mistakes to avoid when dealing with the OBDII code B138A GMC include ignoring the code, misdiagnosing the issue as a simple wiring problem, or attempting repairs without the proper tools or knowledge.
9. How much does it cost to repair the OBDII code B138A GMC?
The cost of repairing the OBDII code B138A GMC can vary depending on the extent of the issue, the parts needed for the repair, and the labor costs. It is recommended to obtain quotes from different mechanics or repair shops for an accurate estimate.
10. Can the OBDII code B138A GMC be prevented?
While some causes of the OBDII code B138A GMC may be unavoidable, regular maintenance of the vehicle's electrical system, checking for any wiring issues, and addressing any warning signs promptly can help prevent the code from triggering.
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