AutoCodes – Buick – C1201 Buick

C1201 Buick Code - Left Front Wheel Speed Sensor Circuit Range Performance

Quick Answer

As the wheel is rotated, the speed sensor produces an AC voltage that increases with wheel speed. Common causes include Faulty Left Front Wheel Speed Sensor, Left Front Wheel Speed Sensor harness is open or shorted, Left Front Wheel Speed 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: C1201 Buick indicates Left Front Wheel Speed Sensor Circuit Range Performance.
Common causes: Common causes include Faulty Left Front Wheel Speed Sensor, Left Front Wheel Speed Sensor harness is open or shorted, Left Front Wheel Speed 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 295

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 Nov 19, 2023

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C1201 Buick Description

As the wheel is rotated, the speed sensor produces an AC voltage that increases with wheel speed. The Electronic Brake Control Module (EBCM) uses the frequency of the AC signal to calculate the wheel speed. The speed sensor is connected to the EBCM by a twisted pair of wires. Twisting reduces noise susceptibility that may cause a Diagnostic Trouble Code (DTC) to be set. The DTC will be set when the left front wheel speed is accelerating or decelerating beyond reasonable limits.

OBDII Code C1201 Buick - Left Front Wheel Speed Sensor Circuit Range Performance - AutoCodes.com — C1201 Buick Code - Left Front Wheel Speed Sensor Circuit Range Performance

What does this mean?

What are the Possible Causes of the DTC C1201 Buick?

Faulty Left Front Wheel Speed Sensor
Left Front Wheel Speed Sensor harness is open or shorted
Left Front Wheel Speed Sensor circuit poor electrical connection
Faulty Electronic Brake Control Module (EBCM)

How to Fix the DTC C1201 Buick?

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 C1201 Buick 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 C1201 Buick Code

1. What does the OBDII code C1201 mean on a Buick?

C1201 indicates a problem with the left front wheel speed sensor circuit, specifically its range or performance, which may affect the ABS or traction control system.

2. What are the symptoms of code C1201 on a Buick?

Common symptoms include an illuminated ABS or traction control warning light, inconsistent braking performance, or loss of stability control functionality.

3. What causes the C1201 code to appear on my Buick?

The code is typically caused by a faulty left front wheel speed sensor, damaged wiring or connectors, or debris interfering with the sensor's operation.

4. Can I drive my Buick with the C1201 code?

While the vehicle may still be drivable, the ABS and traction control systems may not function properly, increasing the risk of unsafe driving conditions.

5. How do I diagnose the C1201 code on a Buick?

Diagnosis involves inspecting the left front wheel speed sensor, checking for damaged wires or connectors, and using a multimeter to test sensor functionality.

6. What tools are needed to fix the C1201 code on a Buick?

Basic tools like a multimeter, a diagnostic scanner, and possibly a socket set are typically needed to inspect and replace the sensor or repair wiring.

7. How much does it cost to fix the C1201 code on a Buick?

Repair costs vary, but replacing a wheel speed sensor typically ranges from $150 to $300, including parts and labor.

8. Can a dirty wheel speed sensor cause the C1201 code?

Yes, dirt or debris on the sensor or its reluctor ring can interfere with its operation and trigger the C1201 code.

9. How do I clear the C1201 code after repairs?

Use an OBDII scanner to clear the code after repairing or replacing the faulty component. If the problem persists, the code may return.

10. Is the C1201 code specific to Buicks, or does it apply to other brands?

While C1201 can appear on other vehicles, the specifics of the code, such as "Left Front Wheel Speed Sensor Circuit Range Performance," may vary by manufacturer.