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Home >> GMC >> 2005 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 213 (Automatic Transmission - 5L40-E/5L50-E - (DTC P0757 To DTC P1833)) >> DTC P1621 >> Diagnostic Aids

Diagnostic Aids

WARNING: This page is about a different car, the 2005 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.

TCM reprogramming may cause P1621 to set.

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