GM Service Manual Online
For 1990-2009 cars only

No 3-4 Upshift

Checks

Causes

Shift solenoid A

Refer to DTC 53 .

Shift solenoid B

Refer to DTC 58 .

ATF temperature sensor

Refer to DTC 17 .

O/D switch

Faulty switch

Shift switch

Refer to DTC 55 .

Transmission control module (TCM)

Refer to Diagnostic System Check - Automatic Transmission .

Line pressure out of range

Operation of the control valve spool.