Fault Code 28: Pressure Regulator (Line Short Circuit To Ground, Or Open Circuit)/Pressure Regulating Solenoid (MV4) Open Circuit

NOTE: For circuit reference, see WIRING DIAGRAMS .

This fault code will cause the transmission to switch to limp home mode in low and high ranges. It will also cause a shift in pressure to maximum, and harsh gear shifts and engagement.

For fault code description and diagnostic test procedure, see Fig 1 and Fig 2 . Freeze frame variables are N-MOT, VGT-$X and UBATT. See TEST PROCEDURE under SELF-DIAGNOSTIC SYSTEM.

Fig 1: Fault Code 28 Description

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Fig 2: Fault Code 28 Diagnostic Test Procedure

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