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C0191 Pontiac Code - Longitudinal Accelerometer Signal Voltage

Quick Answer

The C0191 diagnostic trouble code (DTC) for Pontiac vehicles refers to an issue with the longitudinal accelerometer signal voltage. Common causes include Faulty longitudinal accelerometer, Damaged or corroded wiring/connectors in the accelerometer circuit, ECU software glitch or malfunction. 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 Pontiac indicates Longitudinal Accelerometer Signal Voltage.
Common causes
Common causes include Faulty longitudinal accelerometer, Damaged or corroded wiring/connectors in the accelerometer circuit, ECU software glitch or malfunction.
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 14, 2024
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Code C0191 Pontiac Description

The C0191 diagnostic trouble code (DTC) for Pontiac vehicles refers to an issue with the longitudinal accelerometer signal voltage. The accelerometer is a crucial component in the vehicle's stability control system, as it measures acceleration forces acting on the vehicle in the longitudinal (front to back) direction. The signal voltage from the accelerometer is used by the vehicle's electronic control unit (ECU) to adjust various systems, such as traction control, stability control, and anti-lock brakes, to ensure optimal vehicle performance and safety.

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

Common Causes of C0191 Pontiac

  1. Faulty longitudinal accelerometer.
  2. Damaged or corroded wiring/connectors in the accelerometer circuit.
  3. ECU software glitch or malfunction.
  4. Impact or physical damage to the accelerometer.
  5. Electrical interference or noise affecting the accelerometer signal.

Symptoms of C0191 Pontiac

  1. Illuminated traction control or stability control warning light on the dashboard.
  2. Decreased traction or stability control performance.
  3. Harsh or erratic shifting from the transmission.
  4. Loss of power or acceleration.
  5. Increased stopping distances or difficulty braking.

How to Fix C0191 Pontiac

  1. Begin by performing a visual inspection of the accelerometer and its wiring harness for any visible damage or corrosion. Repair or replace any damaged components.
  2. Use a diagnostic scan tool to read and clear the C0191 code from the ECU's memory. Monitor the longitudinal accelerometer signal voltage while driving to verify the issue.
  3. Test the accelerometer's output voltage using a multimeter to ensure it falls within the manufacturer's specified range. Replace the accelerometer if necessary.
  4. Check for any software updates or recalibrations available for the ECU related to the accelerometer signal processing.
  5. If the issue persists, consult a professional mechanic or dealership for further diagnosis and potential component replacement.

Cost to Fix C0191 Pontiac

The cost of repairing a C0191 code on a Pontiac vehicle can vary depending on the specific cause of the issue. In general, replacing a faulty longitudinal accelerometer can range from $200 to $500, including parts and labor. However, additional diagnostic time and labor costs may apply, with hourly rates typically ranging from $80 to $150 at most auto repair shops. It's recommended to consult with a trusted mechanic or dealership for an accurate estimate based on your vehicle's 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 Pontiac Code

1. What are the common symptoms of OBDII code C0191 in a Pontiac related to the Longitudinal Accelerometer Signal Voltage?

- The common symptoms include the traction control light being illuminated on the dashboard, erratic ABS operation, and potential loss of stability control.

2. What could be causing the OBDII code C0191 in a Pontiac indicating an issue with the Longitudinal Accelerometer Signal Voltage?

- Possible causes may include a malfunctioning longitudinal accelerometer sensor, damaged wiring or connectors, or issues with the accelerometer circuit itself.

3. How can I diagnose the OBDII code C0191 in my Pontiac that points to a problem with the Longitudinal Accelerometer Signal Voltage?

- A thorough visual inspection of the wiring and connectors, testing the longitudinal accelerometer sensor, and checking the circuit for continuity can help diagnose the issue.

4. Can I drive my Pontiac with the OBDII code C0191 related to the Longitudinal Accelerometer Signal Voltage active?

- It is not recommended to drive the vehicle with this code active, as it may affect the proper functioning of the traction control system and stability control.

5. Is it possible to reset the OBDII code C0191 in a Pontiac without addressing the underlying issue with the Longitudinal Accelerometer Signal Voltage?

- While it is possible to clear the code temporarily, it is important to address the root cause to prevent potential safety and performance issues in the future.

6. What are some repair tips for resolving the OBDII code C0191 in a Pontiac associated with the Longitudinal Accelerometer Signal Voltage?

- Repair tips may include checking and repairing any damaged wiring, replacing the longitudinal accelerometer sensor if faulty, and ensuring all connections are secure.

7. How critical is it to fix the OBDII code C0191 in a Pontiac related to the Longitudinal Accelerometer Signal Voltage promptly?

- It is important to address this issue promptly to ensure the proper functioning of safety systems like traction control and stability control while driving.

8. Can extreme weather conditions or rough driving cause the OBDII code C0191 related to the Longitudinal Accelerometer Signal Voltage in a Pontiac?

- Extreme weather conditions or rough driving could potentially contribute to issues with the longitudinal accelerometer sensor or its related components, triggering this code.

9. Are there any recalls or technical service bulletins related to the OBDII code C0191 in Pontiac vehicles concerning the Longitudinal Accelerometer Signal Voltage?

- It is recommended to check with the manufacturer or a certified dealership to see if there are any recalls or technical service bulletins addressing this specific OBDII code.

10. How much can I expect to spend on repairing the OBDII code C0191 in my Pontiac associated with the Longitudinal Accelerometer Signal Voltage?

- The cost of repair can vary depending on the root cause of the issue, but it may involve expenses for parts replacement, labor, and diagnostic testing.

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