AutoCodes – GMC – C0191 GMC

C0191 GMC Code - Longitudinal Accelerometer Signal Voltage

Quick Answer

The ignition 1 circuit supplies 12 volts to the longitudinal accelerometer. Common causes include Faulty Yaw Sensor/Lateral Accelerometer Sensor, Yaw Sensor/Lateral Accelerometer Sensor harness is open or shorted, Yaw Sensor/Lateral Accelerometer 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: C0191 GMC indicates Longitudinal Accelerometer Signal Voltage.
Common causes: Common causes include Faulty Yaw Sensor/Lateral Accelerometer Sensor, Yaw Sensor/Lateral Accelerometer Sensor harness is open or shorted, Yaw Sensor/Lateral Accelerometer 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 1,547

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 May 09, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C0191 GMC Description

The ignition 1 circuit supplies 12 volts to the longitudinal accelerometer. When the vehicle is not moving, or is being driven at a constant, steady speed, longitudinal acceleration is 0 m/sec/sec (0 ft/sec/sec) and the longitudinal accelerometer signal voltage is very near 2.5 volts. This is referred to as longitudinal accelerometer bias voltage. Vehicle acceleration or deceleration causes the longitudinal accelerometer signal voltage to increase or decrease. The harder the acceleration or deceleration, the greater the change in signal voltage.

OBDII Code C0191 GMC - Longitudinal Accelerometer Signal Voltage - AutoCodes.com — C0191 GMC Code - Longitudinal Accelerometer Signal Voltage

What does this mean?

What are the Possible Causes of the DTC C0191 GMC?

Faulty Yaw Sensor/Lateral Accelerometer Sensor
Yaw Sensor/Lateral Accelerometer Sensor harness is open or shorted
Yaw Sensor/Lateral Accelerometer Sensor circuit poor electrical connection

How to Fix the DTC C0191 GMC?

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 C0191 GMC 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 C0191 GMC Code

1. What are the common symptoms of OBDII code C0191 GMC (Longitudinal Accelerometer Signal Voltage)?

- Common symptoms include the illumination of the check engine light, issues with vehicle stability control, and potential loss of traction control.

2. What can cause OBDII code C0191 GMC to trigger?

- The code C0191 GMC is typically triggered by a fault in the longitudinal accelerometer signal voltage, which may be caused by damaged wiring, a faulty accelerometer sensor, or issues with the vehicle's electronic stability control module.

3. How serious is OBDII code C0191 GMC?

- While the code itself may not cause immediate drivability issues, it can affect the proper functioning of the vehicle's stability control system, potentially compromising safety in certain driving conditions.

4. Can I continue driving with OBDII code C0191 GMC active?

- It is not recommended to continue driving with the code active, as it may lead to unexpected stability control issues and compromise the vehicle's overall safety.

5. How can I diagnose the cause of OBDII code C0191 GMC?

- Diagnosing the cause of code C0191 GMC typically involves using a diagnostic scanner to check for specific fault codes, inspecting the wiring and connectors related to the longitudinal accelerometer, and testing the accelerometer sensor itself.

6. What are some repair tips for addressing OBDII code C0191 GMC?

- Repair tips may include checking and repairing any damaged wiring or connectors, replacing the faulty longitudinal accelerometer sensor, and resetting the fault codes to see if the issue persists.

7. Can I clear OBDII code C0191 GMC without fixing the underlying issue?

- While you can clear the code temporarily, it is not recommended as the underlying issue will likely trigger the code again, potentially leading to safety concerns and further damage.

8. How much does it cost to repair OBDII code C0191 GMC?

- The cost of repairing OBDII code C0191 GMC can vary depending on the specific cause of the issue, the extent of the repairs needed, and the labor rates of the repair shop. It is advisable to consult with a professional mechanic for an accurate estimate.

9. Is OBDII code C0191 GMC covered under warranty?

- Whether OBDII code C0191 GMC is covered under warranty will depend on the specific terms of your vehicle's warranty and the cause of the issue. It is recommended to check with your vehicle manufacturer or dealership for more information.

10. How can I prevent OBDII code C0191 GMC from recurring in the future?

- To prevent the recurrence of OBDII code C0191 GMC, it is essential to address any underlying issues promptly, perform regular maintenance checks on the vehicle's stability control system, and drive attentively to avoid potential sensor damage.