Won't shift into overdrive

1997 CHEVROLET BLAZER
18,600 MILES • 6 CYL • 4WD • AUTOMATIC
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PHILIP49
  • MEMBER
  • 1 POST
won't shift into overdrive causing poor mileage due to a higher RPM. could this be a sensor problem?
Nov 21, 2008 at 5:38 PM
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BLUELIGHTNIN6
  • ✓ASE Certified Mechanic
  • 16,542 POSTS
  • ASE Certified Mechanic
If your transmission is picking up a fault it will go into protection mode which is no overdrive. This may just be a solenoid or sensor. Unfortunately it could be something more serious like a pressure problem. Long term running in this condition will most likely cause damage. I suggest having a transmission shop do a diagnostic on it. That is a small price to pay when compared with a rebuilt or new transmission.
Nov 21, 2008 at 10:26 PM
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