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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 16 (Automatic Transmission - 6T40 - DTC P0601 To DTC P0971) >> Diagnostic Information and Procedures >> DTC P0815, P0816, or P0826: Up and Down Shift Switches >> Diagnostic Aids

Diagnostic Aids

WARNING: This page is about a different variant/trim than selected.

A high resistance in the signal circuit may not set a DTC. Symptoms could include an inoperative manual mode Tap Up/Down, or a Tap Down shift when the Tap/Up button is pressed.

If battery positive voltage is not present at the shift selector lever, it will not cause a DTC to set, but will result in an inoperative manual mode Tap Up/Down.

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