P1890

DTC P1890: Problem in Shift Control System

NOTE: Record all freeze data and review General Troubleshooting Information before you troubleshoot.

1. Check whether the OBD II scan tool indicates another code.
Does the OBD II scan tool indicate another code?
YES-Do the DTC Troubleshooting for the indicated code(s). Recheck for DTC P1890 after troubleshooting.
NO-Go to step 2.
2. Measure the stall speed rpm in the [D] position.
Is the stall speed over 3,500 rpm?
YES-Replace the transmission.
NO-If the stall speed is below 2,000 rpm, replace the lower valve body assembly. If the stall speed is 2,000 - 3,500 rpm, GO to step 3.
3. Drive the vehicle at 37 mph (60 km/h) constantly for several minutes, and check the engine speed with respect to vehicle speed.
Is the engine speed within specification?
YES-Replace the lower valve body assembly.
NO-Replace the transmission.