Powertrain
generic / SAE
P0944
Hydraulic Pressure Unit Loss of Pressure
TCM detects rapid loss of hydraulic pressure in transmission accumulator or main pump circuit.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number9 / 44
Possible causes
- Accumulator leak high
- Pump seal failed medium
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Inspection / repair
- Difficulty: shop only
- DIY: shop recommended
- Estimated cost: 600–3500 €
- Estimated time: 3–12 h
- Component: hydraulic accumulator
- Component: transmission pump
- Component: valve body
- MIL / check engine light
- limp mode possible
Sources
References
sae:J2012