Question about 1991 Cadillac DeVille

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I pulled up the codes and e91 come up what is it how do i fix it

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PRNDL SWITCH PROBLEM IS E91 ACCORDING TO THE BOOK, I LOOKED IT UP IN.

PRNDL stands for Park, Reverse, Neutral, Drive, Low, the same things found on your automatic transmission shifter labels.

The switch is probably bad. Replace it or check connections to it, or check that the Reverse lights go on when the indicator says it is in Reverse on the Dash.

SES light may be on due to this problem.

Maybe not rotated or calibrated right to the shifting positions. I never had this problem in a 1990 Cadillac Deville which is similar to yours.

Good luck.

Posted on Jul 03, 2010

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