PowertrainP172A
CautionSeverity: Caution - get it checked when you can
Output speed sensor direction not plausible - forward
Key terms: Control module: a small computer that runs one part of the car · Powertrain: engine, transmission and emissions
1What it means in plain English
The engine or powertrain control system has stored a fault that does not have specific guidance in this database yet.
2Common causes
- Sensor or actuator fault
- Wiring or connector fault
- Vacuum or intake leak
- Fuel or ignition problem
- Control module fault
3Can I drive?
Have it diagnosed promptly. If the car runs and drives normally, drive gently to a workshop. If it runs badly, stalls, overheats, loses oil pressure, or a warning light is flashing or red, stop safely and get professional help. If the code concerns the brakes, brake vacuum or brake assist, do not drive until it is checked: a hard pedal or longer stopping distance means stop.
This page gives general information. It is not professional advice. For a definite diagnosis and a repair quote, ask a qualified mechanic to inspect the car.
4Brand data 17
| Brand | Code | Description | System |
|---|---|---|---|
| BYD | P172A | 13 gear solenoid valve short to ground Brand | Powertrain |
| Daewoo | P172A | No description available | Powertrain |
| EOBD | P172A | Clutchaktuatorventil Brand | Powertrain |
| GM | P172A | No description available | Powertrain |
| Holden | P172A | Output Speed Sensor Direction Not Plausible - Forward Brand | Powertrain |
| Honda | P172A | No description available | Powertrain |
| Land Rover | P172A | Shift Fork D Stuck_ Movement On Shift Fork B Brand | Powertrain |
| Mahindra | P172A | No description available | Powertrain |
| Maserati | P172A | Gear Selector Switch Brand | Powertrain |
| Opel | P172A | No description available | Powertrain |
| Peugeot | P172A | No description available | Powertrain |
| Proton | P172A | No description available | Powertrain |
| Saab | P172A | No description available | Powertrain |
| MG (SAIC) | P172A | Outshaft speed rationality fault Brand | Powertrain |
| Subaru | P172A | No description available | Powertrain |
| Toyota | P172A | Output speed sensor direction not plausible - forward Brand | Powertrain |
| Volkswagen | P172A | Clutch actuator valve open circuit Brand | Powertrain |
Legend: SAE is the generic J2012 description; Brand is text taken from that manufacturer’s data. Manufacturer rows keep the wording and language of the source data, and non-English text is tagged so screen readers pronounce it correctly.
5Extended variant codes 3
These 7-character codes are manufacturer-specific variants of P172A and may be reported by some scan tools.
| Brand | Code | Description | System |
|---|---|---|---|
| Mercedes-Benz | P172A00 | Der DIRECT SELECT-Wahlhebel hat Funktionsstörung. Brand | Powertrain |
| Mercedes-Benz | P172A29 | The DIRECT SELECT lever has a malfunction. There is an invalid signal. Brand | Powertrain |
| Mercedes-Benz | P172A2A | The DIRECT SELECT lever has a malfunction. There is no signal change. Brand | Powertrain |
6Related codes
Browse Pxxx codes or P172xx codes.