AutoCodes – Generic – C191B

C191B Code - Rear Vehicle Speed Signal

Quick Answer

The Active Stabilizer Suspension System uses CAN communication to gather information necessary for control functions. Common causes include Faulty Speed Sensor, Speed Sensor harness is open or shorted, Speed 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: C191B indicates Rear Vehicle Speed Signal.
Common causes: Common causes include Faulty Speed Sensor, Speed Sensor harness is open or shorted, Speed 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 1,020

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 Dec 05, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C191B Description

The Active Stabilizer Suspension System uses CAN communication to gather information necessary for control functions. When a malfunction occurs in another system the Diagnostic Trouble Code (DTC) is stored.

OBDII Code C191B - Rear Vehicle Speed Signal - AutoCodes.com — C191B Code - Rear Vehicle Speed Signal

What does this mean?

What are the Possible Causes of the DTC C191B?

Faulty Speed Sensor
Speed Sensor harness is open or shorted
Speed Sensor circuit poor electrical connection
Faulty Rear Active Stabilizer Control ECU

How to Fix the DTC C191B?

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 C191B 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 C191B code?

Need more information on how to fix the C191B code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C191B code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

C191B Lexus — Rear Vehicle Speed Signal
C191B Toyota — Rear Vehicle Speed Signal

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 Code

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

- Common symptoms include erratic speedometer readings, ABS or traction control system malfunctions, and illumination of the ABS warning light.

2. What are the possible causes of OBDII code C191B?

- Possible causes include a faulty rear wheel speed sensor, damaged wiring or connectors in the rear speed sensor circuit, or a malfunctioning ABS control module.

3. How can I diagnose the issue related to OBDII code C191B?

- Diagnose the issue by performing a visual inspection of the rear wheel speed sensor and its wiring, checking for loose connections, and using an OBDII scanner to read the trouble codes and data related to the rear vehicle speed signal.

4. Can I drive my vehicle with OBDII code C191B?

- It is not recommended to drive your vehicle with OBDII code C191B as it can affect the proper functioning of the ABS and traction control systems, compromising the vehicle's safety.

5. How can I repair OBDII code C191B?

- Repair the issue by replacing the faulty rear wheel speed sensor, repairing damaged wiring or connectors, or reprogramming the ABS control module as recommended by the manufacturer.

6. Are there any DIY tips for fixing OBDII code C191B?

- DIY tips include checking and cleaning the rear wheel speed sensor connectors, ensuring proper wheel alignment, and conducting a road test to verify the repair.

7. How much does it cost to fix OBDII code C191B?

- The cost to fix OBDII code C191B can vary depending on the cause of the issue, but it typically ranges from $100 to $300 for parts and labor.

8. Can OBDII code C191B cause other problems in my vehicle?

- Yes, OBDII code C191B can cause issues with the ABS and traction control systems, affecting the vehicle's stability and handling on the road.

9. Will OBDII code C191B cause my vehicle to fail an emissions test?

- OBDII code C191B is not directly related to emissions, but it can cause the vehicle to fail an emissions test if it leads to other malfunctions affecting the engine control system.

10. How can I prevent OBDII code C191B from recurring in the future?

- To prevent OBDII code C191B from recurring, ensure regular maintenance of the ABS and traction control systems, inspect the wheel speed sensors periodically, and address any issues promptly.