PowertrainP1646
CautionSeverity: Caution - get it checked when you can
5V reference #3 circuit
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 26
| Brand | Code | Description | System |
|---|---|---|---|
| Ashok Leyland CV | P1646 | Turbocharger. Mechanical Error. Boost Pressure Too High. Signal B Brand | Powertrain |
| BYD | P1646 | 4th gear not in place Brand | Powertrain |
| Chery | P1646 | No description available | Powertrain |
| Daewoo | P1646 | 5V Ref (C) Circ Brand | Powertrain |
| Daihatsu | P1646 | Transmission control ECU fault Brand | Powertrain |
| DFXK | P1646 | No description available | Powertrain |
| EOBD | P1646 | Abi sisendid Brand | Powertrain |
| Geely | P1646 | No description available | Powertrain |
| GM | P1646 | 5V Ref (C) Circ Brand | Powertrain |
| Great Wall | P1646 | Injector control valve injection limitation quality balance fault Brand | Powertrain |
| Holden | P1646 | No description available | Powertrain |
| Honda | P1646 | No description available | Powertrain |
| Hyundai | P1646 | No description available | Powertrain |
| Isuzu | P1646 | No description available | Powertrain |
| Land Rover | P1646 | No description available | Powertrain |
| Mahindra | P1646 | No description available | Powertrain |
| Nissan | P1646 | No description available | Powertrain |
| Perodua | P1646 | Transmission control ECU fault Brand | Powertrain |
| Peugeot | P1646 | No description available | Powertrain |
| Porsche | P1646 | Zusatzwasserpumpe - max Brand | Powertrain |
| Proton | P1646 | No description available | Powertrain |
| Saab | P1646 | 5V Ref (C) Circ Brand | Powertrain |
| Suzuki | P1646 | ID Code Incorrectness Brand | Powertrain |
| Tata | P1646 | Air Conditioning Relay Drive Fault Brand | Powertrain |
| Toyota | P1646 | 5V reference #3 circuit Brand | Powertrain |
| Volkswagen | P1646 | 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 4
These 7-character codes are manufacturer-specific variants of P1646 and may be reported by some scan tools.
| Brand | Code | Description | System |
|---|---|---|---|
| Mercedes-Benz | P164600 | The power supply of circuit 30 is implausible. Brand | Powertrain |
| Mercedes-Benz | P164608 | The power supply of circuit 30 is implausible. Brand | Powertrain |
| Mercedes-Benz | P164609 | The power supply of circuit 30 is implausible. Brand | Powertrain |
| BAIC Motor | P164696 | PTC status - IGBT B drive chip fault Brand | Powertrain |
6Related codes
Browse Pxxx codes or P164xx codes.