I have a 2002 JGC w 70k mi. Today, for the first time, it won't upshift until really high rpms. Is it just Tranny fluid that needs changing, a seal, TV cable?

Any help would be great, thanks in advance!

P1281


Engine is Cold Too Long


Engine coolant temperature remains below normal operating temperatures during vehicle travel (Thermostat).

It may be possible that if the engine computer thinks the engine isn't getting warm, it may delay the shifts to allow the engine to reach higher RPMS (more heat).

my :2cents:

broken, missing termostat.