C1239 2018 GMC Sierra Code - Brake Pressure Sensor 1/2 Correlation
Quick Answer
The Electronic Brake Control Module uses inputs from the Electronic Brake Control Brake Pedal Position Sensor to determine when the brake is applied and how much force is used. Common causes include Faulty Electronic Brake Control Module (EBCM), Electronic Brake Control Module harness is open or shorted, Electronic Brake Control Module 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
- C1239 2018 GMC Sierra indicates Brake Pressure Sensor 1/2 Correlation.
- Common causes
- Common causes include Faulty Electronic Brake Control Module (EBCM), Electronic Brake Control Module harness is open or shorted, Electronic Brake Control Module 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 C1239 2018 GMC Sierra Description
Brake pressure sensor information is communicated from the Electronic Brake Control Module (EBCM) to the Hybrid Control Processor (HCP). This information is used to schedule regenerative braking and engine autostops.
The Diagnostic Trouble Code (DTC) will be set when the Engine Control Module (ECM) detects a corrupted data message from the Electronic Brake Control Module.
What are the Possible Causes of the DTC C1239 2018 GMC Sierra?
- Faulty Electronic Brake Control Module (EBCM)
- Electronic Brake Control Module harness is open or shorted
- Electronic Brake Control Module circuit poor electrical connection
- Faulty Starter/Generator Control Module
How to Fix the DTC C1239 2018 GMC Sierra?
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 C1239 2018 GMC Sierra 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.
Need more information about the C1239 2018 GMC Sierra code?
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Frequently Asked Questions about C1239 2018 GMC Sierra Code
1. What are the common symptoms of OBDII code C1239 on a 2018 GMC Sierra related to the Brake Pressure Sensor 1/2 Correlation?
- Common symptoms include the illumination of the ABS warning light on the dashboard, potential loss of anti-lock brake system functionality, and a decrease in braking performance.
2. What are the possible causes of OBDII code C1239 on a 2018 GMC Sierra?
- The code C1239 can be triggered by issues such as a faulty brake pressure sensor, damaged wiring or connectors in the brake system, low brake fluid levels, or a malfunctioning ABS module.
3. How can I diagnose the cause of OBDII code C1239 on my 2018 GMC Sierra?
- Diagnosis involves using a professional OBDII scanner to read and interpret the code, conducting a visual inspection of brake system components, checking brake fluid levels, and testing the brake pressure sensor and related circuits.
4. Can I continue driving my 2018 GMC Sierra with OBDII code C1239 present?
- It is not recommended to continue driving the vehicle with code C1239 active, as it may lead to compromised braking performance and safety risks. Prompt attention and repair are advised.
5. How can I repair OBDII code C1239 on a 2018 GMC Sierra myself?
- DIY repair options include checking and refilling brake fluid levels, inspecting wiring and connectors for damage, and replacing the brake pressure sensor if found to be faulty. However, for complex issues, it's best to consult a professional mechanic.
6. Is it necessary to reset the OBDII code C1239 after repairing the issue on a 2018 GMC Sierra?
- Yes, it is recommended to clear the code using an OBDII scanner after addressing the root cause, as this will reset the warning light and ensure proper monitoring of the system for any recurring problems.
7. Can a simple brake system bleed fix OBDII code C1239 on a 2018 GMC Sierra?
- While bleeding the brake system can help maintain proper hydraulic pressure, it may not directly resolve the sensor correlation issue causing code C1239. It's important to address the specific root cause for a lasting fix.
8. What is the typical cost to repair OBDII code C1239 on a 2018 GMC Sierra at a professional auto repair shop?
- Repair costs for code C1239 can vary depending on the exact cause and required parts or labor. On average, expect to pay anywhere from $200 to $500 for diagnosis and repairs related to the Brake Pressure Sensor 1/2 Correlation issue.
9. How long does it take to fix OBDII code C1239 on a 2018 GMC Sierra?
- The repair time for code C1239 can vary based on the specific cause and complexity of the issue. Simple fixes like sensor replacement may take a couple of hours, while more intricate problems could require a day or more at the repair shop.
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