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2021
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Blazer L
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Transmission
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Automatic Trans
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Automatic Transmission - 9T50 (M3D), 9T60 (M3T) Or 9T65 (M3V) - Diagnostic Information And Procedures
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Diagnostic Information and Procedures
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DTC P2820 or P2821
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Diagnostic Aids
Diagnostic Aids
High resistance in the circuits of the component Q77J may set DTC P2821 without setting control circuit DTC(s).
A speed sensor reporting an incorrect direction could cause a clutch stuck Off. DTC before setting a speed sensor DTC.