C1221 - Left Front Wheel Speed Sensor Input Signal Is Zero

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3   
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C1221 Possible Causes

  • Faulty Hub Assembly (Left Front Wheel Speed Sensor is part of hub assembly)
  • 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

First diagnose C1221 code

    Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded terminals.

Cost of diagnosing the C1221 code

    Labor: 1.0

    The cost of diagnosing the C1221 code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.

C1221 Possible Symptoms

  • Anti-Lock Brake System (ABS) Warning Light ON
  • Engine Light ON (or Service Engine Soon Warning Light)

C1221 Description

As the wheel spins, the wheel speed sensor produces an AC signal. The Electronic Brake Control Module (EBCM) uses the frequency of the AC signal to calculate the wheel speed. The EBCM will set the OBDII code when the sensor is not to factory specifications.
OBDII Code C1221 - Left Front Wheel Speed Sensor Input Signal Is Zero - AutoCodes.com

C1221 More Information

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C1221 Information for specific makes

  • C1221 BUICK Left Front Wheel Speed Sensor Input Signal Is Zero
  • C1221 CADILLAC Left Front Wheel Speed Sensor Input Signal Is Zero
  • C1221 CHEVROLET Left Front Wheel Speed Sensor Input Signal Is Zero
  • C1221 GMC Left Front Wheel Speed Sensor Input Signal Is Zero
  • C1221 PONTIAC Left Front Wheel Speed Sensor Input Signal Is Zero

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C1221 Comments

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