C1221 on Chevrolet

Left front wheel speed sensor signal is zero (Chevrolet)

Severity not verified — if the car runs badly, have it inspected

The sources define the fault but do not rate whether the car is safe to drive. ABS is a safety system, so treat the ABS light as a reason to get it checked.

Safety-critical system: explanation only, no DIY steps. Source: how we rate severity

This page covers only what differs on Chevrolet. For what C1221 means, the ranked causes and the test order, see the C1221 guide.

What's different on Chevrolet

Chevrolet

  • 2001–2002 · Impala

    Supported by vehicle data

    Owners report the code with C1222 and the ABS light, in one case right after wheel bearing replacement. We found no Chevrolet bulletin naming this code in our extract.

Sources and review

  1. NHTSA complaint ODI 10619472, 2001 Chevrolet Impala — NHTSA ODI
  2. Diagnostic trouble codes C1207-C1210, C1221-C1228, C1232-C1235 (2011 Saab 9-4X) — Saab WIS Online (GM group)
Last reviewed
Written by
Saurabh K.
Editorial review
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Technician review
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This page explains what a code usually means; it is not a substitute for a professional inspection. How we source and review · Report an error

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