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C191B Lexus Code - Rear Vehicle Speed Signal

Quick Answer

The C191B diagnostic trouble code (DTC) for Lexus vehicles specifically refers to an issue with the rear vehicle speed signal. Common causes include Faulty rear wheel speed sensors, Damaged wiring or connectors in the rear vehicle speed signal circuit, Corrosion or debris affecting sensor operation. 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
C191B Lexus indicates Rear Vehicle Speed Signal.
Common causes
Common causes include Faulty rear wheel speed sensors, Damaged wiring or connectors in the rear vehicle speed signal circuit, Corrosion or debris affecting sensor operation.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 16, 2024
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Code C191B Lexus Description

The C191B diagnostic trouble code (DTC) for Lexus vehicles specifically refers to an issue with the rear vehicle speed signal. This code indicates that there is a problem with the sensor or circuit that is responsible for monitoring the speed of the vehicle's rear wheels. The rear vehicle speed signal is crucial for various systems in the vehicle, including the anti-lock braking system (ABS), traction control system, and stability control system. When this signal is compromised, it can lead to a range of performance issues and safety concerns.

OBDII Code C191B Lexus - Rear Vehicle Speed Signal
C191B Lexus Code - Rear Vehicle Speed Signal

Common Causes of C191B Lexus

  1. Faulty rear wheel speed sensors
  2. Damaged wiring or connectors in the rear vehicle speed signal circuit
  3. Corrosion or debris affecting sensor operation
  4. ECM or ABS module malfunction
  5. Wheel bearing issues affecting sensor readings

Symptoms of C191B Lexus

  1. ABS warning light illuminated on the dashboard
  2. Traction control system engaging unexpectedly or inconsistently
  3. Stability control system interventions during normal driving
  4. Inaccurate speedometer readings
  5. Increased stopping distances during braking

How to Fix C191B Lexus

  1. Begin by connecting a diagnostic scanner to the vehicle's onboard diagnostic port to retrieve the specific DTC and confirm the issue with the rear vehicle speed signal.
  2. Inspect the rear wheel speed sensors and their wiring for any visible damage, corrosion, or debris. Clean or replace components as necessary.
  3. Test the rear wheel speed sensors using a multimeter to ensure they are functioning within specifications.
  4. Check the connections and wiring between the sensors and the ECM or ABS module for continuity and proper voltage levels.
  5. If no issues are found with the sensors or wiring, further diagnosis may be required to pinpoint the exact cause of the rear vehicle speed signal problem.

Cost to Fix C191B Lexus

The typical repair costs for addressing a C191B DTC related to the rear vehicle speed signal can vary depending on the specific cause of the issue. In general, replacing a faulty rear wheel speed sensor or repairing damaged wiring may cost between $100 and $300 in parts and labor. However, if the problem is more complex and requires ECM or module replacement, the total repair cost could range from $300 to $800 or more. It's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's advisable to obtain quotes from multiple sources to ensure a competitive price.

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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 C191B Lexus Code

1. What are the common symptoms of OBDII code C191B (Lexus) for Rear Vehicle Speed Signal?

- Common symptoms include erratic or non-functional speedometer, ABS warning light, traction control issues, and potential transmission shifting problems.

2. What are the possible causes of OBDII code C191B (Lexus) for Rear Vehicle Speed Signal?

- The code may be triggered by a faulty wheel speed sensor, damaged wiring or connectors, a malfunctioning ABS module, or issues with the vehicle's stability control system.

3. How can I diagnose the OBDII code C191B (Lexus) for Rear Vehicle Speed Signal?

- Diagnose the code by inspecting the wheel speed sensors, checking the wiring and connectors for damage, scanning the ABS module for related fault codes, and testing the stability control system.

4. Can a DIY enthusiast repair OBDII code C191B (Lexus for Rear Vehicle Speed Signal?

- While basic inspections like checking connections and sensor condition can be done DIY, repairing the underlying issue may require specialized tools and expertise. Professional diagnosis is recommended.

5. Is it safe to continue driving with OBDII code C191B (Lexus) for Rear Vehicle Speed Signal?

- It is not recommended to drive with this code active, as it can affect the vehicle's stability control system, ABS, and transmission operation. Prompt diagnosis and repair are advised.

6. How much does it typically cost to repair OBDII code C191B (Lexus) for Rear Vehicle Speed Signal?

- The cost of repair can vary depending on the underlying issue. Simple fixes like sensor replacement may cost a couple of hundred dollars, while more complex repairs involving modules can be more expensive.

7. Can weather conditions affect the triggering of OBDII code C191B (Lexus) for Rear Vehicle Speed Signal?

- Extreme weather conditions, such as heavy rain or snow, can potentially worsen the symptoms associated with this code by affecting sensor readings and causing electrical issues.

8. Will resetting the OBDII code C191B (Lexus) for Rear Vehicle Speed Signal make it go away permanently?

- Simply clearing the code without addressing the underlying issue will not permanently resolve the problem. The code is likely to reappear until the root cause is identified and fixed.

9. Are there any recalls or service bulletins related to OBDII code C191B (Lexus) for Rear Vehicle Speed Signal?

- It's advisable to check with Lexus dealership or online resources for any recalls or service bulletins related to this specific OBDII code to see if there are known issues or remedies provided by the manufacturer.

10. Can a bad wheel alignment cause OBDII code C191B (Lexus) for Rear Vehicle Speed Signal?

- While a bad wheel alignment itself may not directly cause this code, it can exacerbate issues related to speed sensor readings and stability control systems, potentially leading to the trigger of the code.

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