C1226 on Chevrolet

Excessive wheel speed variation at one front wheel (GM)

This page covers only what differs on Chevrolet. For what C1226 means, the ranked causes and the test order, see the C1226 guide.

What's different on Chevrolet

Chevrolet

  • 1998–1999 · Venture

    Supported by vehicle data

    GM's 1998-1999 minivan bulletin covers the Venture and revises its diagnostic table for C1226 and the other excessive wheel speed variation codes.

  • 2002 · Impala

    Supported by vehicle data

    A 2002 Impala complaint lists C1226 as right front excessive wheel speed sensor variation, along with C1225 left front and front wheel speed circuit codes.

  • 010525006Status unverified

    Excessive wheel speed variation diagnostic tables revised (C1225 to C1228)

    1998–1999venture · issued · NHTSA 624109

    Revises steps 13 and 15 of the excessive wheel speed variation diagnostic tables in the ABS section of the service manual. The NHTSA summary does not describe a repair part.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

Sources and review

  1. GM bulletin 01-05-25-006: excessive wheel speed variation diagnostic tables (C1225, C1226, C1227, C1228), 1998-1999 minivans — General Motors via NHTSA ,
  2. NHTSA complaint ODI 10224551 (2002 Chevrolet Impala, C1226 readout) — NHTSA Office of Defects Investigation (consumer complaint)
  3. GM bulletin 3300: ABS light on with C1226 or unwanted ABS or TCS activation, Cadillac DeVille, Eldorado, Seville — General Motors via NHTSA ,
Last reviewed
Written by
Saurabh K.
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