Sierra Classic 1500 4WD V8-5.3L (2007)
Pressure Regulating Solenoid: Service and Repair
Allison - Automatic Transmission
Control Valve Solenoid Replacement (PCS1 and PCS2)
Removal Procedure
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.
4. Important:
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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.
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The pressure control valve retaining bracket (5) must not be modified. Note that the angle between the 2 bracket surfaces is less than 90°.
