AutoCodes – Generic – C1159

C1159 Code - Hydraulic Fluid Pressure/ Flow Circuit Short to Gnd

Quick Answer

The Anti-Lock Brake System (ABS) Module monitors the Hydraulic Fluid Pressure Sensor. Common causes include Faulty Hydraulic Fluid Pressure Sensor, Hydraulic Fluid Pressure Sensor harness is open or shorted, Hydraulic Fluid Pressure Sensor 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: C1159 indicates Hydraulic Fluid Pressure/ Flow Circuit Short to Gnd.
Common causes: Common causes include Faulty Hydraulic Fluid Pressure Sensor, Hydraulic Fluid Pressure Sensor harness is open or shorted, Hydraulic Fluid Pressure Sensor 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 10,573

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 18, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C1159 Description

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

OBDII Code C1159 - Hydraulic Fluid Pressure/ Flow Circuit Short to Gnd - AutoCodes.com — C1159 Code - Hydraulic Fluid Pressure/ Flow Circuit Short to Gnd

What does this mean?

What are the Possible Causes of the DTC C1159?

Faulty Hydraulic Fluid Pressure Sensor
Hydraulic Fluid Pressure Sensor harness is open or shorted
Hydraulic Fluid Pressure Sensor circuit poor electrical connection

How to Fix the DTC C1159?

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 C1159 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 C1159 code?

Need more information on how to fix the C1159 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C1159 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 C1159 Code

1. What are common symptoms of OBDII code C1159?

- Common symptoms include illuminated ABS or brake warning lights on the dashboard, a decrease in braking performance, and potential issues with the hydraulic braking system.

2. What can cause the OBDII code C1159 to trigger?

- The code C1159 is typically triggered by a short to ground in the hydraulic fluid pressure or flow circuit, which can be caused by damaged wiring, a faulty ABS pump or module, or a problem with the hydraulic control unit.

3. How serious is OBDII code C1159?

- OBDII code C1159 is considered a serious issue as it relates to the hydraulic fluid pressure or flow circuit in the braking system. It can lead to compromised braking performance and safety concerns, so it should be addressed promptly.

4. Can I continue driving with OBDII code C1159 present?

- It is not recommended to continue driving with OBDII code C1159 present, as it may affect the braking performance of your vehicle. It is advisable to have the issue diagnosed and repaired as soon as possible.

5. How do I diagnose OBDII code C1159?

- Diagnosing OBDII code C1159 typically involves using a professional OBDII scanner to retrieve the code, conducting a visual inspection of the wiring and components in the hydraulic system, and performing further testing to identify the specific cause of the issue.

6. What are some repair tips for OBDII code C1159?

- Repair tips for OBDII code C1159 may include checking and repairing any damaged wiring, testing and potentially replacing the ABS pump or module, inspecting and cleaning the hydraulic control unit, and resetting the trouble code after completing repairs.

7. Can OBDII code C1159 be a DIY fix?

- While some basic troubleshooting steps can be performed by DIY enthusiasts, diagnosing and repairing OBDII code C1159 often requires specialized tools and expertise. It is recommended to consult a professional mechanic for accurate diagnosis and repair.

8. How much does it cost to fix OBDII code C1159?

- The cost of fixing OBDII code C1159 can vary depending on the specific cause of the issue, the extent of the repairs needed, and labor rates in your area. It is advisable to obtain quotes from local mechanics to determine the cost.

9. Is it safe to clear the OBDII code C1159 without fixing the underlying issue?

- Clearing the OBDII code C1159 without addressing the underlying issue can temporarily turn off the warning light, but it will not fix the problem in the hydraulic system. It is important to fix the root cause to ensure the safety and performance of your vehicle.

10. How can I prevent OBDII code C1159 from recurring?

- To prevent OBDII code C1159 from recurring, it is essential to perform regular maintenance on your vehicle, including checking the brake system for any signs of wear or damage, addressing any warning lights promptly, and following the manufacturer's recommended service schedule.