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Acadia AT4
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Automatic Trans
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Automatic Transmission - 9T50 (M3H), 9T60 (M3G) Or 9T65 (M3W) - Diagnostic Information And Procedures
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Diagnostic Information and Procedures
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DTC P2820 or P2821
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DTC Descriptor
DTC Descriptor
DTC P2820
Transmission Control Solenoid Valve 9 Stuck Off
DTC P2821
Transmission Control Solenoid Valve 9 Stuck On