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Home >> Pontiac >> 2009 >> Vibe Base, 2.4 0, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (Automatic Transmission - MVB 4 Speed) >> Diagnostic Information and Procedures >> DTC P0976 or P0977 >> Circuit Description

Circuit Description

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Shifting from 1st to 4th is performed in combination with "ON" and "OFF" operation of the shift solenoid valves S1 and S2 which is controlled by the engine control module (ECM). If an open or short circuit occurs in either of the shift solenoid valves, the ECM controls the remaining normal shift solenoid valve to allow the vehicle to be operated smoothly (fail safe function). The ECM will illuminate the MIL and store the DTC.

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