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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 18 (Automatic Transmission - ALLISON - Introduction (2 Of 2)) >> Description and Operation >> Transmission Indicators and Messages >> Conditions Which May Cause a BLANK PRNDL

Conditions Which May Cause a BLANK PRNDL

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The PRNDL display may be blank because of failure of the internal mode switch circuits A, B, C, or P.

The transmission will command the most appropriate range, based on reverse pressure switch and the remaining internal mode switch inputs.