AutoCodes – Generic – C1479

C1479 Code - Rear Left Wheel Brake Pressure Control Plausibility Failure

Quick Answer

The Hydraulic Control Unit (HCU) monitors the Rear Left Wheel Brake Pressure. Common causes include Brake System Bleeding, Faulty Hydraulic Control Unit (HCU), Hydraulic Control Unit (HCU) harness is open or shorted. 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: C1479 indicates Rear Left Wheel Brake Pressure Control Plausibility Failure.
Common causes: Common causes include Brake System Bleeding, Faulty Hydraulic Control Unit (HCU), Hydraulic Control Unit (HCU) harness is open or shorted.
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 1,867

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 Oct 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C1479 Description

The Hydraulic Control Unit (HCU) monitors the Rear Left Wheel Brake Pressure. The HCU sets the OBDII code when the Rear Left Wheel Brake Pressure is not to factory specifications.

OBDII Code C1479 - Rear Left Wheel Brake Pressure Control Plausibility Failure - AutoCodes.com — C1479 Code - Rear Left Wheel Brake Pressure Control Plausibility Failure

What does this mean?

What are the Possible Causes of the DTC C1479?

Brake System Bleeding
Faulty Hydraulic Control Unit (HCU)
Hydraulic Control Unit (HCU) harness is open or shorted
Hydraulic Control Unit (HCU) circuit poor electrical connection

How to Fix the DTC C1479?

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 C1479 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 C1479 code?

Need more information on how to fix the C1479 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C1479 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

C1479 Ford — Rear Left Wheel Brake Pressure Control Plausibility Failure
C1479 Lincoln — Rear Left Wheel Brake Pressure Control Plausibility Failure
C1479 Mercury — Rear Left Wheel Brake Pressure Control Plausibility Failure

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 C1479 Code

1. What does the OBDII code C1479 mean?

C1479 indicates a plausibility failure in the rear left wheel brake pressure control system, often related to an issue with the ABS or electronic stability control system.

2. What are the common symptoms of code C1479?

Symptoms may include the ABS warning light or stability control light being illuminated, reduced braking performance, and potential loss of traction control functionality.

3. What causes the C1479 code to appear?

Common causes include a faulty ABS module, a malfunctioning brake pressure sensor, damaged wiring or connectors, or air or contamination in the brake fluid.

4. Can I drive my car with a C1479 code?

It is possible to drive with this code, but it is not recommended, as the ABS and stability control systems may not function properly, increasing the risk of accidents in emergency braking or slippery conditions.

5. How do I diagnose the C1479 code?

Diagnosis involves scanning the ABS module for related codes, visually inspecting wiring and connectors, and testing the rear left brake pressure sensor and hydraulic system for faults.

6. Can a low brake fluid level trigger the C1479 code?

Yes, low brake fluid or air in the brake lines can cause pressure control issues and trigger this code. Ensure the brake fluid is at the proper level and free of air bubbles.

7. How do I fix the C1479 code?

Repairs may include replacing a faulty ABS module, repairing damaged wiring, replacing the brake pressure sensor, or bleeding the brake system to remove air or contamination.

8. How much does it cost to fix a C1479 code?

Repair costs vary depending on the issue but may range from $100 for a simple brake fluid flush to $1,000 or more for ABS module replacement.

9. Can a faulty ABS module cause the C1479 code?

Yes, a malfunctioning ABS module can fail to properly control brake pressure, leading to this code.

10. How can I prevent the C1479 code from recurring?

Regularly maintain your brake system, check brake fluid levels, inspect ABS components, and address any braking issues promptly to prevent future occurrences of this code.