There may be a transmission performance concern on some 2014-2017 Spark models equipped with the CVT7 continuously variable-ratio automatic transmission (RPOs M4M, MR8). (Fig. 12) The Check Engine MIL may be illuminated and DTCs P0871 (Transmission Fluid Pressure Switch 3 System Performance) and P2714 (Pressure Control Solenoid Valve 4 Stuck Off—Hydraulic/Mechanical Problem) may be set in the Transmission Control Module (TCM).
If DTCs P0871 and P2714 are set in the TCM, clear the codes and road test the vehicle. If the codes do not reset, no repairs should be made.
Fig. 12
When either DTC P0871 or P2714 sets, the TCM commands the auxiliary gearbox into 2nd gear. If the codes do reset after the road test, replace the transmission fluid pressure switch. Refer to the appropriate Service Information.
Replacing the Switch
After removing the control valve body cover, remove the fluid strainer from the control valve body and discard the O-ring from the fluid strainer. A new O-ring must be installed to the fluid strainer.
Two fluid pressure switch harness bracket bolts secure the switch. Disconnect the fluid pressure switch connector to remove the switch from the control valve body. (Fig. 13)
Fig. 13
When reinstalling the control valve body cover, do not reuse the gasket. Install the 14 cover bolts by hand and then tighten all bolts to specification in the specified sequence. (Fig. 14)
Fig. 14
Currently, the transmission fluid pressure switch must be ordered from the Warranty Parts Center (WPC). Refer to #PIP5521A for the necessary order form and for additional information.
– Thanks to Terry Neuendorf
