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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 19 (Automatic Transmission - ALLISON - Introduction (2 Of 2)) >> Repair Instructions >> Control Valve Solenoid Replacement (PCS1 and PCS2) >> Removal Procedure

Removal Procedure

WARNING: This page is about a different variant/trim than selected.
  1. Remove the oil pan and transmission internal oil filter. Refer to Oil Pan Replacement .
  2. Disconnect the internal wiring harness from the solenoid being changed.
  3. Remove the 2 bolts that fasten reverse signal pipe to the control valve assembly. Remove the reverse signal pipe.
    Fig 1: Removing Reverse Signal Pipe Bolts
    GM1633276Courtesy of GENERAL MOTORS CORP.
    4. IMPORTANT:
    • When the pressure control valve retaining bracket (5) is removed, there are 2 sets of accumulators (3) and springs (6) which may fall from the bores. Be sure to catch the accumulators and springs so as to prevent damage to these parts.
    • The pressure control valve retaining bracket (5) must not be modified. Note that the angle between the 2 bracket surfaces is less than 90 degrees. Replace the bracket if the angle is 90 degrees or more.
    Fig 2: Exploded View Of PCS1 and PCS2 Components
    GM1633279Courtesy of GENERAL MOTORS CORP.
  4. To remove the pressure control solenoid 1 (PCS1) or PCS2, remove three bolts (4) and the pressure control valve retaining bracket (5). Remove accumulators (3) and springs (6) if they do not fall out when the bracket (5) is removed.
  5. Note the position of the solenoid connector and pull the solenoid (1) or (8) out of the bore in the control valve assembly. The O-ring on the solenoid provides the resistance felt during removal.
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