Transfer Case Selector Switch – GM (20972859)

Transfer Case Selector Switch is part of the circuit that reports engine or transmission behaviour back to the control module. It is read continuously, and a value that drifts out of range sets a fault code long before the driver notices anything.

Replace the Case Selector Switch when the code returns after clearing, when the live data reading is out of range at operating temperature, or when the housing shows heat damage. Check the ground and the connector pins first.

This Case Selector Switch is listed as part 20972859 (Sensors & Switches). Where a number has been superseded, the current reference is the one that ships, so check any supersession note before ordering.

Genuine GM supplied for this Case Selector Switch, with the engineering number unchanged from the factory reference stamped on the original.