C0138 GMC Code - Base Brake System Pressure Circuit/Sensor Low
Quick Answer
The Electronic Brake Control Module (EBCM) uses an input from 2 brake fluid pressure sensors to enhance ABS braking and vehicle stability if equipped. Common causes include Faulty Electronic Brake Control Module (EBCM), Electronic Brake Control Module (EBCM) harness is open or shorted, Electronic Brake Control Module (EBCM) 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
- C0138 GMC indicates Base Brake System Pressure Circuit/Sensor Low.
- Common causes
- Common causes include Faulty Electronic Brake Control Module (EBCM), Electronic Brake Control Module (EBCM) harness is open or shorted, Electronic Brake Control Module (EBCM) 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 C0138 GMC Description
What are the Possible Causes of the DTC C0138 GMC?
- Faulty Electronic Brake Control Module (EBCM)
- Electronic Brake Control Module (EBCM) harness is open or shorted
- Electronic Brake Control Module (EBCM) circuit poor electrical connection
How to Fix the DTC C0138 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.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the C0138 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 C0138 GMC Code
What does the OBDII code C0138 mean for my GMC vehicle?
The OBDII code C0138 indicates a low signal from the base brake system pressure circuit or sensor, suggesting that the brake system is not receiving the proper pressure reading.
What are the common symptoms of the C0138 code?
Common symptoms include a brake warning light on the dashboard, reduced braking performance, and in some cases, an audible warning or message indicating a brake system issue.
What could cause the C0138 code to trigger?
Possible causes include a faulty brake pressure sensor, wiring issues such as damaged or corroded connectors, or problems with the brake hydraulic system itself.
How can I diagnose the C0138 code?
To diagnose the C0138 code, check the brake fluid level, inspect the wiring and connectors for damage, test the brake pressure sensor with a multimeter, and scan for other related codes that may provide additional information.
Is it safe to drive my vehicle with the C0138 code?
Driving with the C0138 code may not be safe, as it can indicate issues with brake performance. It is recommended to have the vehicle inspected and repaired as soon as possible.
What repairs are typically needed for a C0138 code?
Repairs may involve replacing a faulty brake pressure sensor, repairing or replacing damaged wiring, or addressing any underlying issues with the brake system, such as fluid leaks or hydraulic problems.
Can I clear the C0138 code myself?
Yes, you can clear the C0138 code using an OBDII scanner, but this will not fix the underlying issue. It is important to diagnose and repair the root cause before clearing the code.
How much does it typically cost to repair the issue related to the C0138 code?
Repair costs can vary widely depending on the diagnosis, but replacing a brake pressure sensor may range from $100 to $300, while more extensive repairs could cost more.
Will the C0138 code affect my vehicle's performance?
Yes, the C0138 code can affect braking performance, leading to reduced braking efficiency or a potential failure of the brake system, making it crucial to address the issue promptly.
Discuss the causes and fixes for C0138 GMC OBDII Code
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