AutoCodes – Cadillac – C0138 Cadillac

C0138 Cadillac 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 Cadillac 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.

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Code Popularity 1,317

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 08, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C0138 Cadillac Description

The Electronic Brake Control Module (EBCM) uses an input from 2 brake fluid pressure sensors to enhance ABS braking and vehicle stability if equipped.

OBDII Code C0138 Cadillac - Base Brake System Pressure Circuit/Sensor Low - AutoCodes.com — C0138 Cadillac Code - Base Brake System Pressure Circuit/Sensor Low

What does this mean?

What are the Possible Causes of the DTC C0138 Cadillac?

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 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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C0138 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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Need Help with the Code?

Get the C0138 Cadillac code diagnosed by a professional: Find a repair shop in your area

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about C0138 Cadillac Code

1. What are the common symptoms of OBDII code C0138 Cadillac?

- Common symptoms include the illumination of the ABS warning light, a decrease in braking performance, and potential issues with the vehicle's stability control system.

2. What could cause the OBDII code C0138 Cadillac to trigger?

- This code is typically triggered by a low pressure signal detected in the base brake system, often due to a faulty brake pressure sensor or issues with the brake hydraulic system.

3. How serious is the OBDII code C0138 Cadillac?

- This code indicates a potential issue with the base brake system pressure circuit, which could compromise the vehicle's braking performance and safety. It is advisable to address this issue promptly.

4. What are some DIY repair tips for OBDII code C0138 Cadillac?

- DIY repair tips include checking the brake fluid level, inspecting for any leaks in the brake system, and ensuring the brake pressure sensor is functioning correctly. However, it is recommended to consult a professional for accurate diagnosis and repair.

5. Can driving with the OBDII code C0138 Cadillac cause further damage?

- Continuing to drive with this code may lead to degraded braking performance, potential safety risks, and further damage to the brake system components. It is best to address the issue promptly.

6. How can I diagnose OBDII code C0138 Cadillac?

- Diagnosis involves using a diagnostic scanner to retrieve the specific code, inspecting the brake hydraulic system for leaks or damage, and testing the brake pressure sensor for proper functionality.

7. Is it safe to continue driving my Cadillac with the ABS warning light on due to code C0138?

- It is not recommended to drive with the ABS warning light illuminated, as it indicates a potential issue with the base brake system pressure circuit that could compromise braking performance and vehicle safety.

8. How much does it typically cost to repair OBDII code C0138 Cadillac?

- The cost of repair can vary depending on the underlying cause of the code. It may involve sensor replacement, brake system repairs, or other related components. Costs can range from a few hundred to over a thousand dollars.

9. Can I reset the OBDII code C0138 Cadillac without fixing the underlying issue?

- While you can clear the code temporarily, it will likely reappear if the underlying issue is not addressed. It is important to diagnose and repair the root cause to prevent further complications.

10. What is the role of the base brake system pressure sensor in the Cadillac?

- The base brake system pressure sensor helps monitor and regulate the hydraulic pressure within the brake system, providing crucial data for the vehicle's stability control and ABS functions.