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C0191 Buick Code - Longitudinal Accelerometer Signal Voltage

Quick Answer

The C0191 Buick diagnostic trouble code (DTC) specifically refers to an issue with the longitudinal accelerometer signal voltage in the vehicle. Common causes include Faulty longitudinal accelerometer sensor, Damaged wiring or connectors related to the sensor, Corrosion or poor connections in the sensor circuit. 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
C0191 Buick indicates Longitudinal Accelerometer Signal Voltage.
Common causes
Common causes include Faulty longitudinal accelerometer sensor, Damaged wiring or connectors related to the sensor, Corrosion or poor connections in the sensor circuit.
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 15, 2024
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Code C0191 Buick Description

The C0191 Buick diagnostic trouble code (DTC) specifically refers to an issue with the longitudinal accelerometer signal voltage in the vehicle. The longitudinal accelerometer is a sensor that measures the vehicle's acceleration in the forward and backward direction. This sensor plays a crucial role in various safety systems, such as traction control, stability control, and anti-lock braking systems. When the signal voltage from the longitudinal accelerometer deviates from the expected range, it can trigger the C0191 DTC.

OBDII Code C0191 Buick - Longitudinal Accelerometer Signal Voltage
C0191 Buick Code - Longitudinal Accelerometer Signal Voltage

Common Causes of C0191 Buick

  1. Faulty longitudinal accelerometer sensor.
  2. Damaged wiring or connectors related to the sensor.
  3. Corrosion or poor connections in the sensor circuit.
  4. Issues with the vehicle's control modules receiving the sensor data.
  5. Electrical interference affecting the sensor signal.

Symptoms of C0191 Buick

  1. Traction control or stability control warning lights illuminated on the dashboard.
  2. Decreased traction or stability while driving, especially in slippery conditions.
  3. ABS (Anti-lock Braking System) warning light appearing on the dashboard.
  4. Unusual braking behavior, such as pulsating brakes or longer stopping distances.
  5. Decreased fuel efficiency due to compromised vehicle performance.

How to Fix C0191 Buick

  1. Begin by diagnosing the specific cause of the C0191 DTC using a professional diagnostic scan tool.
  2. Inspect the longitudinal accelerometer sensor, wiring, and connectors for any visible damage or corrosion.
  3. Test the sensor's signal voltage and compare it to the manufacturer's specifications to determine if it is within the acceptable range.
  4. Replace the faulty longitudinal accelerometer sensor if necessary and ensure all connections are secure.
  5. Clear the DTC from the vehicle's computer system and perform a test drive to verify that the issue has been resolved.

Cost to Fix C0191 Buick

The typical repair costs for addressing the C0191 Buick code can vary depending on the specific cause of the issue and the labor rates in your area. In general, replacing a faulty longitudinal accelerometer sensor can cost between $150 and $300, including parts and labor. Additional costs may apply if there are other underlying issues contributing to the code. It's important to consider that diagnostic time and labor rates at auto repair shops can vary, with rates typically ranging between $80 and $150 per hour. Be sure to check with local repair shops for a more accurate estimate based on your vehicle make and model.

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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 C0191 Buick Code

1. What does the OBDII code C0191 mean on a Buick?

C0191 refers to a problem with the longitudinal accelerometer signal voltage, which is critical for systems like traction control and stability control.

2. What are the common symptoms of the C0191 code in a Buick?

Symptoms may include the ABS or traction control light turning on, poor stability control performance, or erratic braking behavior.

3. What causes the C0191 code to appear in a Buick?

Common causes include a faulty longitudinal accelerometer sensor, damaged wiring or connectors, or issues with the ABS control module.

4. Can I drive my Buick with the C0191 code active?

While the vehicle may still be drivable, safety features like traction control and stability assist might not work properly, increasing the risk of losing control in certain conditions.

5. How do I diagnose the C0191 code on a Buick?

Diagnosis involves scanning the ABS system for additional codes, inspecting the wiring and connectors for damage, and testing the longitudinal accelerometer sensor for proper operation.

6. How do I fix the C0191 error code in my Buick?

Repairs could include replacing a faulty accelerometer sensor, repairing damaged wiring or connectors, or recalibrating the stability control system.

7. Where is the longitudinal accelerometer sensor located in a Buick?

The sensor is often located near the center of the vehicle, typically under the center console or beneath the carpet in the cabin.

8. Does the C0191 code require recalibration after repairs?

Yes, after replacing or repairing the sensor, recalibration of the stability control system may be necessary using a diagnostic tool.

9. Can a weak battery cause the C0191 code in a Buick?

Yes, a weak or failing battery can cause voltage-related issues that may trigger this code.

10. How much does it cost to fix the C0191 code on a Buick?

Repair costs can range from $150 to $500, depending on whether the issue is with the sensor, wiring, or control module.

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