Low Main Line Pressure in All Ranges
WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
| Condition | Action |
|---|---|
| Incorrect fluid level | Correct the fluid level. Refer to Transmission Fluid Check . |
| Plugged or faulty suction filter | Clean or replace the oil suction filter element. Refer to Oil Pan Replacement . |
| Main pressure regulator valve sticking | Overhaul the control module assembly. |
| Leaking solenoids in control valve body assembly | Replace the solenoids. Refer to Control Valve Solenoid Replacement (SS1, SS2, SS3, TCC, and MAIN MOD) or Control Valve Solenoid Replacement (PCS1 and PCS2) . |
| Main pressure regulator valve spring weak, broken, or missing | Inspect the spring and replace, if necessary. |
| Control module body leakage - separator plate not flat, loose control valve body bolts | Replace or rebuild the control module assembly. Care should be taken when removing and labeling shift springs. |
| Faulty or incorrect fluid pressure gage | Repair or replace the gage. |
| Oil pump worn or damaged | Replace or rebuild the oil pump. |
| Leak in suction circuit | Inspect the suction circuit for leaking seal, gasket, or mating surface. |