B138A Cadillac 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 Cadillac 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 Cadillac Description
What are the Possible Causes of the DTC B138A Cadillac?
- 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 Cadillac?
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 Cadillac 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 Cadillac Code
1. What are common symptoms of OBDII code B138A in a Cadillac related to the Control Module Voltage Reference Output Circuit?
- Common symptoms include engine stalling, rough idling, poor fuel economy, and issues with the vehicle's electrical system.
2. What are some possible causes of OBDII code B138A in a Cadillac?
- Possible causes include a faulty control module, damaged wiring or connectors in the voltage reference circuit, or a malfunctioning sensor.
3. How can I diagnose the issue causing OBDII code B138A in my Cadillac?
- Use a diagnostic scanner to retrieve the trouble code and perform a thorough inspection of the control module, wiring, and connectors in the voltage reference circuit.
4. Can I drive my Cadillac with OBDII code B138A present?
- It is not recommended to drive the vehicle with this code present, as it can lead to potential issues with the engine performance and the vehicle's electrical system.
5. How can I repair OBDII code B138A in my Cadillac?
- Repair options include replacing the faulty control module, repairing or replacing damaged wiring or connectors, and ensuring proper voltage output in the circuit.
6. Is it safe to clear the OBDII code B138A in my Cadillac without addressing the underlying issue?
- Clearing the code without addressing the underlying issue may temporarily remove the warning light, but the problem will persist and could lead to further damage.
7. Are there any common mistakes to avoid when troubleshooting OBDII code B138A in a Cadillac?
- Avoid overlooking simple issues like loose connectors or damaged wiring, as these can often be the root cause of the problem.
8. Can a DIY enthusiast repair OBDII code B138A in a Cadillac, or should it be done by a professional?
- While some repairs may be possible for a DIY enthusiast, diagnosing and repairing complex issues related to the control module voltage reference output circuit is best left to a professional.
9. How much can I expect to pay to repair OBDII code B138A in my Cadillac?
- Repair costs can vary depending on the exact cause of the issue, but expect to pay anywhere from $100 to $500 for parts and labor.
10. How can I prevent OBDII code B138A from reoccurring in my Cadillac?
- Regular maintenance, including checking the control module, wiring, and connectors, can help prevent this code from reoccurring in the future.
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