EXPERTEC TSB (217102)

Publication date: 1992-01-13
Reference number: 217102

EXPERTEC TSB

TECHNICAL SERVICE BULLETIN

Reference Number(s): 217102, Date of Issue: 01/13/92

STUCK IN FIRST GEAR (4L80E) - (REPLACE INPUT SPEED SENSOR)

Model(s): 1991-92 GMC or Chevrolet Truck Models equipped with a 4L80E

Bulletin No.: Chevrolet 217102

GMC 217102

Date: 01/13/1992

SERVICE INFORMATION

THE SERVICE INFORMATION SHOWN BELOW IS INTENDED FOR ELECTRONIC DELIVERY TO SERVICE TECHNICIANS. DUE TO THE NATURE OF THIS INFORMATION, IT IS NOT INTENDED FOR PAPER PUBLICATION.

WHEN DIAGNOSING A 1991 OR 1992 TRUCK EQUIPPED WITH A 4L80E FOR A CONDITION OF NO UPSHIFT OR STUCK IN 1ST GEAR AND NO CODES ARE STORED, CHECK FOR AN INPUT SPEED SENSOR MALFUNCTION. IF THE INPUT SPEED SENSOR IS NOT FUNCTIONING, THEN THE OUTPUT SPEED SENSOR IS NOT USED FOR REFERENCE BY THE PCM/TCM AND AN UPSHIFT CANNOT OCCUR.

DISCLAIMER