AutoCodes – Generic – C1029

C1029 Code - ABS Primary Circuit Pressure Lower Than Secondary

Quick Answer

The Anti-Lock Brake System (ABS) Module monitors the ABS Primary Circuit Pressure. Common causes include Faulty Anti-Lock Brake System (ABS) Module, Anti-Lock Brake System (ABS) Module harness is open or shorted, Anti-Lock Brake System (ABS) 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: C1029 indicates ABS Primary Circuit Pressure Lower Than Secondary.
Common causes: Common causes include Faulty Anti-Lock Brake System (ABS) Module, Anti-Lock Brake System (ABS) Module harness is open or shorted, Anti-Lock Brake System (ABS) 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.

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Code Popularity 10,603

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 Aug 06, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code C1029 Description

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

OBDII Code C1029 - ABS Primary Circuit Pressure Lower Than Secondary - AutoCodes.com — C1029 Code - ABS Primary Circuit Pressure Lower Than Secondary

What does this mean?

What are the Possible Causes of the DTC C1029?

Faulty Anti-Lock Brake System (ABS) Module
Anti-Lock Brake System (ABS) Module harness is open or shorted
Anti-Lock Brake System (ABS) Module circuit poor electrical connection

How to Fix the DTC C1029?

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 does this mean?

Code Tech Notes

C1029:00 ABS Primary Circuit Pressure Lower Than Secondary: No Sub Type Information

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C1029 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 C1029 code?

Need more information on how to fix the C1029 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C1029 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

C1029 Ford — ABS Primary Circuit Pressure Lower Than Secondary
C1029 Lincoln — ABS Primary Circuit Pressure Lower Than Secondary
C1029 Mercury — ABS Primary Circuit Pressure Lower Than Secondary

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 C1029 Code

1. What are the common symptoms of OBDII code C1029?

- Common symptoms include the ABS warning light illuminating on the dashboard, decreased braking performance, and potential loss of traction control.

2. What could cause the ABS Primary Circuit Pressure to be lower than the secondary circuit?

- Potential causes include a faulty ABS pump, damaged wiring or connectors in the ABS system, low brake fluid level, or a malfunctioning ABS control module.

3. How can I diagnose the issue related to OBDII code C1029?

- Diagnosis typically involves using a professional OBDII scanner to read and interpret the ABS system codes, conducting a visual inspection of ABS components, and testing the ABS pump and pressure sensors.

4. Is it safe to drive with the ABS Primary Circuit Pressure lower than the Secondary code active?

- It is not recommended to drive with this code active, as it can affect the proper functioning of the ABS system and compromise your vehicle's braking performance and safety.

5. How can I repair OBDII code C1029 related to ABS Primary Circuit Pressure?

- Repair may involve replacing a faulty ABS pump, repairing or replacing damaged wiring or connectors, checking and refilling the brake fluid, or reprogramming the ABS control module as needed.

6. Can a DIY enthusiast fix OBDII code C1029 at home?

- While some basic troubleshooting like checking the brake fluid level can be done at home, diagnosing and repairing issues related to this code often require professional expertise and specialized tools.

7. Will resetting the OBDII code C1029 resolve the underlying issue?

- Resetting the code may temporarily clear the warning light, but it will not fix the root cause of the problem. It is important to diagnose and repair the issue to ensure proper ABS system function.

8. What is the typical cost to repair OBDII code C1029?

- The cost of repair can vary depending on the specific cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

9. How often does OBDII code C1029 occur in vehicles?

- OBDII code C1029 related to ABS primary circuit pressure issues can occur in vehicles equipped with ABS systems, especially in older vehicles or those with high mileage.

10. Can OBDII code C1029 affect other systems in the vehicle?

- While the primary impact is on the ABS system, issues related to this code can potentially affect other safety systems like traction control and stability control, compromising overall vehicle safety.