P21A9

P21A9

DTC P21A9, sometimes indicated as P21A900 is an OBD diagnostic trouble code indicating a manufacturer-specific fault with the vehicle powertrain (i.e. engine and gearbox). This code identifies an error with the air/fuel mixture causing p21a9.


    DTC Trouble Code Search
    Bulletins

    Bulletins are notices put out by manufacturers in conjunction with the NHTSA to notify the public of manufacturing issues or changes.

    • PIE0453 - ENGINE (PWS)
      CHEVROLET: This engineering informational bulletin is requesting information from the field on vehicles that have the condition of malfunction indicator lamp illuminated with dtc P21A9, P203B, or P206B set.
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