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Code C0521

Symptoms

• Uneven tire wear

• Steering wheel off-center

• Vehicle pulling to one side

Common Causes

• Faulty wheel alignment sensor

• Damaged wiring or connectors

• Misaligned suspension components

Glossary

OBD-II: On-Board Diagnostics, a standardized system in vehicles for self-diagnosis and reporting.

Sensor: A device that detects or measures a physical property and records, indicates, or otherwise responds to it.

Related Codes

• C0522

• C0523

Laymans terms

This code means there's a problem with one of the car's wheels not being straight, like when a shopping cart wheel wobbles.

Explanation

C0521 indicates an issue with the vehicle's wheel alignment sensor.

Technical description

The C0521 code is triggered when the Electronic Suspension Control Module detects a malfunction in the wheel alignment sensor, which could affect the vehicle's stability and handling.

Diagnosis steps

• Inspect the wheel alignment sensor and its wiring.

• Check for any visible damage or disconnections.

• Perform a wheel alignment check.

Repair procedures

• Replace the faulty wheel alignment sensor.

• Repair or replace damaged wiring.

• Realign the vehicle's wheels.

Tools required

• OBD-II scanner

• Multimeter

• Wheel alignment machine

Estimated repair cost

$150 - $400

Difficulty level

Moderate

Commonly affected vehicles

• Chevrolet Silverado

• GMC Sierra

• Cadillac Escalade

Preventive measures

• Regular wheel alignment checks

• Routine inspection of suspension components

• Keeping tires properly inflated

Error code type

Sensor Issue

User experience recommendations

• Avoid rough terrains to prevent misalignment.

• Regularly check tire pressure.

• Schedule routine maintenance checks.

Warranty information

Check with the vehicle manufacturer for warranty coverage on suspension components.

Historical data

C0521 is a common code in vehicles with electronic suspension systems, often related to sensor wear or damage.

Urgency level

Moderate – It should be addressed soon to prevent further wear on tires and ensure safe handling.

Legal and safety notice

Ignoring this code can lead to unsafe driving conditions and may void certain warranties.

Testing conditions

• Vehicle on a flat surface

• Engine running

Component location

The wheel alignment sensor is typically located near the wheel hub or suspension components.

FAQs

Q: Can I drive with a C0521 code?
A: It's possible, but not recommended as it can lead to uneven tire wear and unsafe driving conditions.

Q: How often should I check my wheel alignment?
A: It's recommended to check your wheel alignment every 6,000 to 10,000 miles, or if you notice any handling issues.

Last updated: Apr 20, 2026 • Source: internal database
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