overdrive

2002 JEEP GRAND CHEROKEE LAREDO
158,987 MILES • 4.0L • 6 CYL • 2WD • AUTOMATIC
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DEREK HELMS
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What could be the cause for it not to shift into overdrive changed all sensors and slonide inside it and changed output sensor
Feb 19, 2017 at 12:00 PM
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CARADIODOC
  • ✓ASE Certified Mechanic
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  • ASE Certified Mechanic
The place to start is by reading and recording any diagnostic fault codes. Next is to view live data on a scanner to see if overdrive is being "requested" or "denied". If it's being requested but the transmission isn't going into overdrive, it's a mechanical issue in the transmission. If it's being denied, look at the "Inputs / Outputs screen to see why. The most common cause is an erroneous temperature reading that is telling the computer the fluid temperature is too low to allow overdrive to occur.
Feb 19, 2017 at 5:52 PM
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