To the solenoid valves These are small electronic components located inside the hydraulic block (also known as the valve body) of the AL4/DP0 automatic transmission, widely used in older Citroën models. Their function is vital: they act as electronic “taps,” controlling the flow and pressure of the transmission fluid used to engage gears smoothly and precisely.
The defect or malfunction of these valves, usually caused by the accumulation of dirt or wear, is the origin of most problems of this transmission. The main symptom of failure is the strong and abrupt jolts When shifting gears, both during acceleration and deceleration, the fluid pressure is not being controlled correctly.
In more critical situations, the car may enter “limp mode,” locking the transmission in third gear to prevent damage. Replacing the solenoid valves (there are usually two main pressure valves) and correctly changing the fluid are often the solution to restore smooth transmission operation.
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