Abrupt 1-2 Upshift. Chevrolet Joy 2008

For 1990-2009 cars

Checks | Causes
--- | ---
ATF temperature sensor | Refer to DTC 17 .
Line pressure solenoid | Refer to DTC 48 .
Throttle position sensor | Refer to DTC 54 .
Throttle angle | Throttle angle out of adjustment. Refer to Symptoms - Engine Controls .
Transmission control module (TCM) | Refer to Diagnostic System Check - Automatic Transmission .
2-4 brake band | Burnt or worn 2-4 brake band
1-2 accumulator | Malfunction of accumulator
Broken or damaged oil pump | Seized or broken pump gears
Control valve spool | Control valve spool error
A/C signal circuit to TCM | Harsh shift with open A/C signal circuit when A/C is requested ON