P0842 — Transmission fluid pressure sensor — low signal
Reference detail for fault code P0842 on the DQ400E DSG transmission family.
What P0842 indicates
The DQ400E transmission control unit stores P0842 when it detects the following condition: Transmission fluid pressure sensor — low signal. The fault concerns a pressure sensor or pressure switch in the transmission. The control unit uses these signals for clutch and system pressure control, and stores the code when the signal is out of range, too low or implausible. A stored code does not by itself prove that a part has failed. Before replacing anything, check the live data, wiring, connectors, power supply and fluid condition, and confirm the fault on the vehicle.
Symptoms
- Harsh engagement or judder
- Emergency mode
- Pump running unusually
- Transmission warning light
Possible causes
- Faulty pressure sensor
- Wiring or connector fault
- A real hydraulic pressure problem
- Fault in the control electronics
Related components
Pressure sensor · Mechatronic unit
| Fault code | P0842 |
|---|---|
| Transmission | DQ400E (6-speed hybrid DSG) |
| Factory code | 0DD |
| Category | Pressure sensor |
| Status | Documented — review advised |
This code is documented but not independently confirmed. Confirm it against the specific vehicle before ordering any part.
Have this code on your vehicle?
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Related pages for the DQ400E
DQ400E repair
Symptoms, mechatronic issues and what repair involves for this family.
DQ400E mechatronics
Replacement mechatronic unit and exchange options for this family.
DQ400E parts
Selected parts most often involved in repair for this family.
DQ400E fault codes
Every documented code for this family in one table.
Have a fault code to check?
Send us the code and the vehicle details and we will confirm the correct unit or part by email.