AutoCodes – GMC – C0221 GMC

C0221 GMC Code - Right Front Speed Sensor or Circuit Open

Quick Answer

As the wheel spins, the wheel speed sensor produces an Alternating Current (AC) signal. Common causes include Faulty Right Front Speed Sensor, Right Front Speed Sensor harness is open or shorted, Right Front 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: C0221 GMC indicates Right Front Speed Sensor or Circuit Open.
Common causes: Common causes include Faulty Right Front Speed Sensor, Right Front Speed Sensor harness is open or shorted, Right Front 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 25,309

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 Mar 10, 2021

Description
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
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Code C0221 GMC Description

As the wheel spins, the wheel speed sensor produces an Alternating Current (AC) signal. The Electronic Brake Control Module (EBCM) uses the frequency of the AC signal to calculate the wheel speed.

OBDII Code C0221 GMC - Right Front Speed Sensor or Circuit Open - AutoCodes.com — C0221 GMC Code - Right Front Speed Sensor or Circuit Open

What does this mean?

What are the Possible Causes of the DTC C0221 GMC?

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

How to Fix the DTC C0221 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 does this mean?

Code Tech Notes

User Submitted Video

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C0221 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 C0221 GMC Code

1. What are the common symptoms of OBDII code C0221 in a GMC vehicle?

- Common symptoms include the ABS warning light illuminating on the dashboard, issues with the ABS system functionality, and potential traction control problems.

2. What does the OBDII code C0221 for a GMC indicate?

- This code specifically points to a problem with the right front wheel speed sensor or its circuit being open, which can affect the ABS and traction control systems.

3. What are the possible causes of OBDII code C0221 in a GMC?

- The code may be triggered by a faulty right front wheel speed sensor, damaged wiring or connectors in the circuit, or a problem with the sensor's magnetic ring.

4. How can I diagnose the issue causing OBDII code C0221 in my GMC?

- To diagnose the problem, you can use a scan tool to read the code, inspect the right front wheel speed sensor and its connections for any damage, and perform a visual inspection of the sensor's magnetic ring.

5. What are some repair tips for fixing OBDII code C0221 in a GMC?

- Repair tips include checking and replacing the right front wheel speed sensor if necessary, repairing any damaged wiring or connectors in the circuit, and ensuring proper installation of the sensor's magnetic ring.

6. Can I drive my GMC with OBDII code C0221 without immediate repairs?

- It is not recommended to drive the vehicle with this code present, as it can affect the ABS and traction control systems, potentially compromising the vehicle's safety and performance.

7. How much does it typically cost to repair OBDII code C0221 in a GMC?

- Repair costs can vary depending on the specific issue causing the code, but they may range from $100 to $300 for parts and labor, excluding any diagnostic fees.

8. Is it possible to reset OBDII code C0221 in a GMC without fixing the underlying issue?

- While you can clear the code using a scan tool, it is crucial to address the root cause of the problem to prevent the code from reappearing and ensure the proper functioning of the ABS and traction control systems.

9. Are there any preventive measures to avoid OBDII code C0221 in a GMC?

- Regular maintenance, such as inspecting and cleaning the wheel speed sensors and their connections, can help prevent issues that trigger this code and ensure the optimal performance of the ABS system.

10. Can a DIY enthusiast with basic automotive knowledge repair OBDII code C0221 in a GMC?

- Depending on the specific issue, DIY enthusiasts with basic automotive knowledge may be able to address the problem by replacing the right front wheel speed sensor or repairing damaged wiring, but professional diagnosis and repair may be necessary in some cases.