AutoCodes – Generic – C146C

C146C Code - Open In ABS Motor Relay Circuit

Quick Answer

The Motor Relay and motor fail-safe relay are built into the Brake Actuator Assembly. Common causes include Faulty Skid Control ECU (Brake Actuator Assembly), Skid Control ECU harness is open or shorted, Skid Control ECU 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: C146C indicates Open In ABS Motor Relay Circuit.
Common causes: Common causes include Faulty Skid Control ECU (Brake Actuator Assembly), Skid Control ECU harness is open or shorted, Skid Control ECU 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 2,803

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 Jan 29, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C146C Description

The Motor Relay and motor fail-safe relay are built into the Brake Actuator Assembly. During ABS, TRAC, VSC, brake hold, or brake assist operation, the Skid Control ECU (Brake Actuator Assembly) turns on the motor relay to run the pump motor in the Brake Actuator Assembly. When a motor system Diagnostic Trouble Code (DTC) is stored, the motor fail-safe relay cuts the power source supply to the motor relay for fail-safe operation.
This DTC may be stored when the voltage to the motor relay power source is lower than the DTC detection condition due to low output from the battery or alternator.

OBDII Code C146C - Open In ABS Motor Relay Circuit - AutoCodes.com — C146C Code - Open In ABS Motor Relay Circuit

What does this mean?

What are the Possible Causes of the DTC C146C?

Faulty Skid Control ECU (Brake Actuator Assembly)
Skid Control ECU harness is open or shorted
Skid Control ECU circuit poor electrical connection

How to Fix the DTC C146C?

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 C146C 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 C146C code?

Need more information on how to fix the C146C code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C146C code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

C146C Lexus — Open In ABS Motor Relay Circuit
C146C Scion — Open In ABS Motor Relay Circuit
C146C Toyota — Open In ABS Motor Relay Circuit

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 C146C Code

1. What are common symptoms of OBDII code C146C (Open In ABS Motor Relay Circuit)?

- Common symptoms include the ABS warning light illuminating on the dashboard, loss of anti-lock braking system functionality, and potential difficulty in braking.

2. What can cause OBDII code C146C to trigger?

- This code is typically triggered by an open circuit in the ABS motor relay circuit, which may be caused by damaged wiring, a faulty relay, or a poor connection.

3. How can I diagnose the issue related to OBDII code C146C?

- To diagnose the issue, you can perform a visual inspection of the wiring and relay involved in the ABS motor circuit, check for loose connections, and use a multimeter to test for continuity.

4. What are the potential repair options for OBDII code C146C?

- Repair options may include repairing or replacing damaged wiring, replacing the faulty ABS motor relay, ensuring proper connections, and clearing the trouble code with a diagnostic scanner.

5. Can I drive my vehicle with OBDII code C146C present?

- It is not recommended to drive your vehicle with this code present, as it may indicate a potential issue with the anti-lock braking system, compromising your safety on the road.

6. How serious is OBDII code C146C (Open In ABS Motor Relay Circuit)?

- This code is considered serious as it affects the functionality of the anti-lock braking system, which is crucial for safe braking performance, especially in emergency situations.

7. How much does it typically cost to repair OBDII code C146C?

- The cost of repair can vary depending on the extent of the issue, but it may range from a simple fix like repairing a wire to a more complex repair involving replacing the ABS motor relay.

8. Can I reset OBDII code C146C without fixing the underlying issue?

- While you can clear the trouble code with a diagnostic scanner, it is important to address the underlying issue causing the code to prevent further safety risks and ensure proper functionality of the ABS.

9. Are there any DIY repair tips for OBDII code C146C?

- DIY repair tips may include checking and securing wiring connections, inspecting the ABS motor relay for damage, and consulting the vehicle's service manual for specific repair instructions.

10. How long does it typically take to repair OBDII code C146C?

- The repair time can vary depending on the exact cause of the code and the complexity of the repair needed, but it may take anywhere from a few minutes for simple fixes to a few hours for more involved repairs.