PowertrainP1901
CautionSeverity: Caution - get it checked when you can
Main Battery Voltage Reduction
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?
The electrical system may fail and the battery may go flat, risking a stall. If the battery or charging warning light is on, drive straight to a workshop.
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 31
| Brand | Code | Description | System |
|---|---|---|---|
| Ashok Leyland CV | P1901 | No description available | Powertrain |
| Mercedes-Benz | P1901 | No description available | Powertrain |
| BYD | P1901 | TCU fail with timeout Brand | Powertrain |
| Chery | P1901 | Motor blocked Brand | Powertrain |
| Daewoo | P1901 | TSS Circuit Intermittent Malfunction Brand | Powertrain |
| DFFS | P1901 | Brake pedal sensor output is too low Brand | Powertrain |
| DFFX | P1901 | TCU fail with timeout Brand | Powertrain |
| DFXK | P1901 | Insulation fault: level 4 Brand | Powertrain |
| EOBD | P1901 | Adjust switch Brand | Powertrain |
| Ford | P1901 | Main Battery Voltage Reduction Brand | Powertrain |
| Geely | P1901 | TCU fail with timeout Brand | Powertrain |
| GM | P1901 | TSS Circuit Intermittent Malfunction Brand | Powertrain |
| Great Wall | P1901 | TCU fail with timeout Brand | Powertrain |
| Hafei | P1901 | TCU fail with timeout Brand | Powertrain |
| Holden | P1901 | No description available | Powertrain |
| Honda | P1901 | No description available | Powertrain |
| Isuzu | P1901 | No description available | Powertrain |
| Land Rover | P1901 | Turbine shaft speed sensor - circuit intermittent Brand | Powertrain |
| Mahindra | P1901 | No description available | Powertrain |
| Maserati | P1901 | No description available | Powertrain |
| Mazda | P1901 | Main Battery Voltage Reduction Brand | Powertrain |
| Mitsubishi | P1901 | TCU fail with timeout Brand | Powertrain |
| Peugeot | P1901 | No description available | Powertrain |
| Porsche | P1901 | No description available | Powertrain |
| Proton | P1901 | TCU fail with timeout Brand | Powertrain |
| Saab | P1901 | TSS Circuit Intermittent Malfunction Brand | Powertrain |
| MG (SAIC) | P1901 | LIN bus and master node communication timeout Brand | Powertrain |
| Smart | P1901 | No description available | Powertrain |
| Sprinter | P1901 | No description available | Powertrain |
| Suzuki | P1901 | Gear Shift Position Sensor 'A/B' Correlation Brand | Powertrain |
| Tata | P1901 | No description available | 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 P1901 and may be reported by some scan tools.
| Brand | Code | Description | System |
|---|---|---|---|
| Mercedes-Benz | P190100 | Sensitivity drift max error for PCV Brand | Powertrain |
| Sprinter | P190100 | Sensitivity drift max error for PCV Brand | Powertrain |
| SsangYong | P190100 | Variant coding: operating area setting error Brand | Powertrain |
6Related codes
Browse Pxxx codes or P190xx codes.