P173A — Gear shift 3 — engagement fault
Reference detail for fault code P173A on the DQ200 DSG transmission family.
What P173A indicates
The DQ200 transmission control unit stores P173A when it detects the following condition: Gear shift 3 — engagement fault. The fault concerns engaging a gear. The gear selector moves the shift fork hydraulically and a travel sensor reports its position. The code is stored when the gear cannot be engaged, the position does not match the command, or the movement takes too long. 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
- Gear not engaged or engaged with a knock
- Individual gears missing (often every second gear)
- Emergency mode
- Transmission warning light
Possible causes
- Gear selector piston or hydraulic channel fault
- Faulty travel (position) sensor or sensor magnet
- Worn shift fork or synchroniser
- Pressure control fault in the mechatronic unit
Related components
Gear selector (actuator) · Shift fork · Travel sensor · Mechatronic unit
| Fault code | P173A |
|---|---|
| Transmission | DQ200 (7-speed dry DSG) |
| Factory code | 0AM/0CW |
| Category | Gear selection |
| 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 DQ200
DQ200 repair
Symptoms, mechatronic issues and what repair involves for this family.
DQ200 mechatronics
Replacement mechatronic unit and exchange options for this family.
DQ200 parts
Selected parts most often involved in repair for this family.
DQ200 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.