AutoCodes – Lincoln – C1939 Lincoln

C1939 Lincoln Code - Brake Pressure Switch Input Circuit Failure

Quick Answer

The Anti-Lock Brake System (ABS) Module monitors the Brake Pressure Switch (BPS). Common causes include Faulty Brake Pressure Switch (BPS), Brake Pressure Switch (BPS) harness is open or shorted, Brake Pressure Switch (BPS) 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: C1939 Lincoln indicates Brake Pressure Switch Input Circuit Failure.
Common causes: Common causes include Faulty Brake Pressure Switch (BPS), Brake Pressure Switch (BPS) harness is open or shorted, Brake Pressure Switch (BPS) 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 792

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 Dec 05, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C1939 Lincoln Description

The Anti-Lock Brake System (ABS) Module monitors the Brake Pressure Switch (BPS). The ABS Module sets the OBDII code when the Brake Pressure Switch is not to factory specifications.

OBDII Code C1939 Lincoln - Brake Pressure Switch Input Circuit Failure - AutoCodes.com — C1939 Lincoln Code - Brake Pressure Switch Input Circuit Failure

What does this mean?

What are the Possible Causes of the DTC C1939 Lincoln?

Faulty Brake Pressure Switch (BPS)
Brake Pressure Switch (BPS) harness is open or shorted
Brake Pressure Switch (BPS) circuit poor electrical connection

How to Fix the DTC C1939 Lincoln?

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 C1939 Lincoln 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 C1939 Lincoln code?

Need more information on how to fix the C1939 Lincoln code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C1939 Lincoln 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 C1939 Lincoln Code

1. What are the common symptoms of OBDII code C1939 in a Lincoln related to Brake Pressure Switch Input Circuit Failure?

- Common symptoms include the illumination of the check engine light, issues with the brake system, and potential difficulty shifting gears.

2. What are some possible causes of OBDII code C1939 in a Lincoln indicating Brake Pressure Switch Input Circuit Failure?

- The code may be triggered by a faulty brake pressure switch, damaged wiring or connectors in the brake pressure switch circuit, or a malfunctioning brake control module.

3. How can I diagnose OBDII code C1939 in my Lincoln for Brake Pressure Switch Input Circuit Failure?

- Diagnosis involves using an OBDII scanner to retrieve the specific code, inspecting the brake pressure switch and its wiring for any visible damage, and testing the switch for proper functionality.

4. What repair steps can I take to address OBDII code C1939 in my Lincoln related to Brake Pressure Switch Input Circuit Failure?

- Repair may involve replacing the brake pressure switch, repairing or replacing damaged wiring or connectors, or reprogramming the brake control module if necessary.

5. Can I continue to drive my Lincoln with OBDII code C1939 indicating Brake Pressure Switch Input Circuit Failure?

- It is not recommended to drive the vehicle with this code present, as it can affect the proper functioning of the brake system and potentially compromise safety.

6. How much does it typically cost to repair OBDII code C1939 in a Lincoln due to Brake Pressure Switch Input Circuit Failure?

- Repair costs can vary depending on the specific issue, but they may range from $100 to $300 for parts and labor.

7. Are there any preventive measures I can take to avoid OBDII code C1939 in my Lincoln related to Brake Pressure Switch Input Circuit Failure?

- Regular inspection and maintenance of the brake system, including checking the brake pressure switch and its wiring, can help prevent this issue from occurring.

8. Can a DIY enthusiast with some automotive knowledge repair OBDII code C1939 in a Lincoln for Brake Pressure Switch Input Circuit Failure?

- Depending on the exact cause of the issue, some DIY repairs may be possible, but it is recommended to consult a professional mechanic for accurate diagnosis and repair.

9. Will resetting the OBDII code C1939 in my Lincoln related to Brake Pressure Switch Input Circuit Failure make it go away permanently?

- Resetting the code may temporarily turn off the check engine light, but if the underlying issue is not addressed, the code is likely to reappear.

10. Is OBDII code C1939 specific to Lincolns, or can it occur in other vehicle makes and models as well?

- While this code is associated with Lincolns, similar issues related to the brake pressure switch input circuit failure can occur in other vehicle makes and models as well.