AutoCodes – GMC – C1595 2018 GMC Sierra

C1595 2018 GMC Sierra Code - Trailer Brake Signal to Trailer Brake Power Control Module Circuit Malfunction

Quick Answer

The Chassis Control Module-Auxiliary receives inputs from the Trailer Brake Power Control Module; these inputs are used to determine trailer connection and the amount of voltage supplied to the trailer brakes. Common causes include Faulty Trailer Brake Power Control Module, Trailer Brake Power Control Module harness is open or shorted, Trailer Brake Power 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: C1595 2018 GMC Sierra indicates Trailer Brake Signal to Trailer Brake Power Control Module Circuit Malfunction.
Common causes: Common causes include Faulty Trailer Brake Power Control Module, Trailer Brake Power Control Module harness is open or shorted, Trailer Brake Power 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 240

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 Jul 17, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code C1595 2018 GMC Sierra Description

The Chassis Control Module-Auxiliary receives inputs from the Trailer Brake Power Control Module; these inputs are used to determine trailer connection and the amount of voltage supplied to the trailer brakes. The Diagnostic Trouble Code (DTC) will be set when the Trailer Brake Power Control Module detects a short to ground, open, or a short to voltage on the trailer brake control signal circuit.

OBDII Code C1595 2018 GMC Sierra - Trailer Brake Signal to Trailer Brake Power Control Module Circuit Malfunction - AutoCodes.com — C1595 2018 GMC Sierra Code - Trailer Brake Signal to Trailer Brake Power Control Module Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC C1595 2018 GMC Sierra?

Faulty Trailer Brake Power Control Module
Trailer Brake Power Control Module harness is open or shorted
Trailer Brake Power Control Module circuit poor electrical connection
Faulty Chassis Control Module-Auxiliary

How to Fix the DTC C1595 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 C1595 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 C1595 2018 GMC Sierra code?

Need more information on how to fix the C1595 2018 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C1595 2018 GMC Sierra 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 C1595 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code C1595 in a 2018 GMC Sierra related to the Trailer Brake Signal to Trailer Brake Power Control Module Circuit Malfunction?

- Common symptoms include the trailer brake system not functioning properly, warning lights on the dashboard, and potential issues with trailer brake activation.

2. What are the possible causes of OBDII code C1595 in a 2018 GMC Sierra?

- The code C1595 can be triggered by issues such as faulty trailer brake power control module, damaged wiring harness, poor electrical connections, or a malfunctioning trailer brake signal.

3. How can I diagnose the Trailer Brake Signal to Trailer Brake Power Control Module Circuit Malfunction in a 2018 GMC Sierra?

- Diagnosis involves using an OBDII scanner to retrieve the specific fault code, inspecting the trailer brake system components for any visible damage, and testing the electrical connections for continuity.

4. What are some repair tips for addressing OBDII code C1595 in a 2018 GMC Sierra?

- Repair tips include checking and repairing any damaged wiring, ensuring proper grounding of the trailer brake system, replacing a faulty trailer brake power control module, and clearing the fault code with an OBDII scanner after the repair.

5. Can I still safely drive my 2018 GMC Sierra with OBDII code C1595 related to the Trailer Brake Signal to Trailer Brake Power Control Module Circuit Malfunction?

- It is not recommended to drive the vehicle with this code unresolved, as it may affect the proper functioning of the trailer brake system, leading to potential safety risks while towing.

6. Is it possible to reset the OBDII code C1595 in a 2018 GMC Sierra without making any repairs?

- While you can clear the fault code using an OBDII scanner, it is crucial to address the underlying issue causing the Trailer Brake Signal to Trailer Brake Power Control Module Circuit Malfunction to prevent it from recurring.

7. How much does it typically cost to repair OBDII code C1595 in a 2018 GMC Sierra at a professional auto repair shop?

- The cost of repair can vary depending on the root cause of the issue, but it may involve diagnostic labor charges, parts replacement costs, and potential wiring repairs, with an estimated range of $100 to $500 or more.

8. Can extreme weather conditions affect the triggering of OBDII code C1595 in a 2018 GMC Sierra?

- Yes, extreme weather conditions like heavy rain or snow can potentially damage the electrical components of the trailer brake system, leading to issues that trigger the Trailer Brake Signal to Trailer Brake Power Control Module Circuit Malfunction code.

9. Are there any preventive maintenance measures I can take to avoid OBDII code C1595 in my 2018 GMC Sierra in the future?

- Regularly inspecting and maintaining the trailer brake system components, ensuring proper wiring connections, and addressing any issues promptly can help prevent the recurrence of the Trailer Brake Signal to Trailer Brake Power Control Module Circuit Malfunction code.

10. Is it necessary to have specialized tools or equipment to repair OBDII code C1595 related to the Trailer Brake Signal to Trailer Brake Power Control Module Circuit Malfunction in a 2018 GMC Sierra?

- While basic tools like a multimeter and OBDII scanner are helpful for diagnosis and repair, some cases may require specialized equipment or professional expertise to accurately diagnose and resolve the issue.