C0191 Code - Longitudinal Accelerometer Signal Voltage
Quick Answer
The C0191 diagnostic trouble code (DTC) refers to an issue with the longitudinal accelerometer signal voltage in the vehicle. Common causes include Damaged or corroded wiring harness connected to the longitudinal accelerometer, Faulty longitudinal accelerometer sensor, Loose or corroded connectors leading to poor signal voltage transmission. 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 indicates Longitudinal Accelerometer Signal Voltage.
- Common causes
- Common causes include Damaged or corroded wiring harness connected to the longitudinal accelerometer, Faulty longitudinal accelerometer sensor, Loose or corroded connectors leading to poor signal voltage transmission.
- 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 C0191 Description
The C0191 diagnostic trouble code (DTC) refers to an issue with the longitudinal accelerometer signal voltage in the vehicle. The longitudinal accelerometer is a sensor that measures the acceleration of the vehicle in the forward and backward direction. The signal voltage from this sensor is crucial for the proper functioning of various safety systems, such as traction control, stability control, and anti-lock braking systems.
Common Causes of C0191
- Damaged or corroded wiring harness connected to the longitudinal accelerometer.
- Faulty longitudinal accelerometer sensor.
- Loose or corroded connectors leading to poor signal voltage transmission.
- Electronic control module (ECM) issues affecting the accelerometer signal.
Symptoms of C0191
- Illumination of the traction control, stability control, or ABS warning lights on the dashboard.
- Loss of traction or stability while driving, especially during acceleration or braking.
- Increased stopping distance or difficulty maintaining control in slippery conditions.
- Inaccurate speedometer readings or fluctuations in speed readings.
How to Fix C0191
- Begin by connecting a diagnostic scanner to the vehicle's onboard computer to retrieve the specific fault codes, including C0191.
- Inspect the wiring harness and connectors associated with the longitudinal accelerometer for any damage or corrosion. Repair or replace as necessary.
- Test the longitudinal accelerometer sensor for proper function and replace if found to be faulty.
- Clear the fault codes from the ECM and perform a test drive to ensure the issue has been resolved.
- If the problem persists, further diagnosis may be needed to identify any underlying ECM or system issues causing the fault.
Cost to Fix C0191
The cost of repairing a C0191 code can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. In general, the parts for this repair may range from $100 to $300, while labor costs can add another $100 to $200. Overall, the total repair cost could be anywhere from $200 to $500. It's important to note that diagnosis time and labor rates can vary, so it's advisable to check with local auto repair shops for a more accurate estimate based on the specific vehicle and location.
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Code C0191 Information for Specific Makes
- C0191 Buick — Longitudinal Accelerometer Signal Voltage
- C0191 Cadillac — Longitudinal Accelerometer Signal Voltage
- C0191 Chevrolet — Longitudinal Accelerometer Signal Voltage
- C0191 GMC — Longitudinal Accelerometer Signal Voltage
- C0191 Pontiac — Longitudinal Accelerometer Signal Voltage
- C0191 Saturn — Longitudinal Accelerometer Signal Voltage
Frequently Asked Questions about C0191 Code
1. What does OBDII code C0191 mean?
Code C0191 indicates an issue with the longitudinal accelerometer signal voltage, which is used by the vehicle's stability control or ABS system to measure forward and backward acceleration.
2. What are the common symptoms of code C0191?
Symptoms may include the ABS or traction control warning light turning on, poor stability control performance, and reduced traction in slippery conditions.
3. What causes code C0191 to appear?
Common causes include a faulty longitudinal accelerometer, damaged wiring or connectors, corrosion in the sensor circuit, or issues with the ABS control module.
4. Can I drive with code C0191?
While the vehicle may still be drivable, safety features like traction control and stability control may not function properly, increasing the risk of losing control in certain situations.
5. How do I diagnose code C0191?
Start by inspecting the wiring and connectors around the longitudinal accelerometer for damage or corrosion. Use a scan tool to check for related ABS or stability control codes and test the sensor's voltage signals.
6. How is code C0191 fixed?
Repairs may include replacing a faulty longitudinal accelerometer, repairing or replacing damaged wiring, cleaning corroded connectors, or reprogramming the ABS control module if necessary.
7. Where is the longitudinal accelerometer located?
The longitudinal accelerometer is typically located near the center of the vehicle, often under the center console or beneath the driver's seat.
8. What tools are needed to fix code C0191?
You may need a scan tool to read and clear codes, a multimeter to test wiring and sensors, and basic hand tools to access and replace components.
9. How much does it cost to repair code C0191?
Repair costs vary depending on the cause, but replacing the longitudinal accelerometer typically costs between $150 and $400, including parts and labor.
10. Can a software update fix code C0191?
In some cases, a software update for the ABS or stability control module may resolve the issue if the problem is related to programming errors.
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