AutoCodesLexus – C1315 Lexus

C1315 Lexus Code - Changeover Solenoid Malfunction SMC1

Quick Answer

Each solenoid adjusts pressure which affects each wheel cylinder according to signals from the Skid Control Electronic Control Unit (ECU) and controls the vehicle. Common causes include Faulty Brake Actuator Assembly, Faulty Skid Control Electronic Control Unit (ECU), Skid Control ECU 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
C1315 Lexus indicates Changeover Solenoid Malfunction SMC1.
Common causes
Common causes include Faulty Brake Actuator Assembly, Faulty Skid Control Electronic Control Unit (ECU), Skid Control ECU 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.
AI answers can be wrong. Verify repairs with testing. Open full chat
Code Popularity 3,930
How popular is this code, among other codes? Low
Table of contents Created and updated by William Orellana on Sep 06, 2020
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Code C1315 Lexus Description

Each solenoid adjusts pressure which affects each wheel cylinder according to signals from the Skid Control Electronic Control Unit (ECU) and controls the vehicle. The Master Cut Solenoid (SMC 1/2) is closed and blocks the master cylinder pressure from the Electronically Controlled Brake (ECB) control pressure when the system is normal. The master cut solenoid is open and sends the master cylinder fluid pressure to the non–assisted brake wheel cylinders during the fail safe due to system malfunction.
OBDII Code C1315 Lexus - Changeover Solenoid Malfunction SMC1 - AutoCodes.com
C1315 Lexus Code - Changeover Solenoid Malfunction SMC1

What are the Possible Causes of the DTC C1315 Lexus?

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

How to Fix the DTC C1315 Lexus?

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 C1315 Lexus 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.

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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 C1315 Lexus Code

1. What does the OBDII code C1315 mean on a Lexus?

C1315 indicates a "Changeover Solenoid Malfunction SMC1," which relates to an issue with the changeover solenoid in the vehicle's braking or stability control system.

2. What are the common symptoms of code C1315 in a Lexus?

Symptoms may include an illuminated ABS or traction control warning light, reduced braking performance, or issues with stability control operation.

3. What causes the C1315 code to appear in a Lexus?

Possible causes include a faulty changeover solenoid, damaged wiring or connectors, hydraulic fluid contamination, or a malfunction in the ABS control module.

4. How do I diagnose a C1315 code on my Lexus?

Start by checking the changeover solenoid and its wiring for damage or loose connections. Use a scan tool to monitor ABS system data and confirm the solenoid's operation.

5. Can I drive my Lexus with a C1315 code?

While the car may still be drivable, the braking and stability control systems may not function properly, posing a safety risk. It’s best to address the issue promptly.

6. How do I fix the C1315 code on a Lexus?

Repairs may include replacing the faulty changeover solenoid, repairing damaged wiring, cleaning the hydraulic system, or reprogramming the ABS module if necessary.

7. What tools are needed to fix the C1315 code?

You’ll need an OBDII scan tool, a multimeter for electrical tests, and possibly tools to access and replace the solenoid or repair wiring connections.

8. How much does it cost to repair a C1315 code in a Lexus?

The cost can range from $150 to $500 or more, depending on the specific repairs needed, such as solenoid replacement or ABS module work.

9. Can low brake fluid cause a C1315 code in a Lexus?

Low brake fluid typically generates different codes, but hydraulic issues like fluid contamination could potentially affect the changeover solenoid and trigger this code.

10. Does the C1315 code require reprogramming the ABS module?

In some cases, reprogramming or recalibrating the ABS module may be necessary after repairs to clear the code and restore proper system function.

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