AutoCodes – Saturn – C0191 Saturn

C0191 Saturn 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 Saturn 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 945

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 Saturn 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 Saturn - Longitudinal Accelerometer Signal Voltage - AutoCodes.com — C0191 Saturn Code - Longitudinal Accelerometer Signal Voltage

What does this mean?

What are the Possible Causes of the DTC C0191 Saturn?

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 Saturn?

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 Saturn 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 Saturn Code

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

C0191 indicates an issue with the longitudinal accelerometer signal voltage, which is critical for stability control and braking systems.

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

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

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

Common causes include a faulty longitudinal accelerometer sensor, damaged wiring or connectors, or a malfunctioning electronic control module (ECM).

4. Can I drive my Saturn with the C0191 code present?

While the vehicle may still be drivable, safety features like ABS and stability control may not function properly, increasing the risk of an accident.

5. How do you diagnose the C0191 code on a Saturn?

A technician will use a diagnostic scanner to confirm the code, inspect the accelerometer sensor, and check the wiring and connectors for damage or corrosion.

6. How can I fix the C0191 code on a Saturn?

Repairs may involve replacing the faulty longitudinal accelerometer sensor, repairing damaged wiring, or reprogramming the ECM if necessary.

7. Where is the longitudinal accelerometer sensor located on a Saturn?

The sensor is typically located near the center of the vehicle, often under the center console or floorboard.

8. What tools are needed to fix the C0191 code in a Saturn?

Basic tools include a diagnostic scanner, multimeter for testing voltage, and possibly a replacement accelerometer sensor.

9. How much does it cost to repair the C0191 code on a Saturn?

Repair costs can range from $150 to $500 depending on whether the sensor, wiring, or ECM needs to be replaced or repaired.

10. Can a faulty battery cause the C0191 code on a Saturn?

Yes, a weak or failing battery can result in voltage irregularities that may trigger this code. Always check the battery voltage as part of diagnostics.