PowertrainP18C4
CautionSeverity: Caution - get it checked when you can
Gear position sensor circuit 1 low voltage
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 8
| Brand | Code | Description | System |
|---|---|---|---|
| Daewoo | P18C4 | No description available | Powertrain |
| EOBD | P18C4 | Solenod kunci parkir Brand | Powertrain |
| GM | P18C4 | No description available | Powertrain |
| Holden | P18C4 | Gear Position Sensor Circuit 1 Low Voltage Brand | Powertrain |
| Opel | P18C4 | No description available | Powertrain |
| Peugeot | P18C4 | No description available | Powertrain |
| Saab | P18C4 | No description available | Powertrain |
| Toyota | P18C4 | Gear position sensor circuit 1 low voltage 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 2
These 7-character codes are manufacturer-specific variants of P18C4 and may be reported by some scan tools.
| Brand | Code | Description | System |
|---|---|---|---|
| Mercedes-Benz | P18C400 | Self Diagnosis error detection based on the Correction Avg value in NOx sensor 1 Brand | Powertrain |
| Sprinter | P18C400 | Self Diagnosis error detection based on the Correction Avg value in NOx sensor 1 Brand | Powertrain |
6Related codes
Browse Pxxx codes or P18Cxx codes.