PowertrainP0643

Serious

Severity: Serious - have it checked soon

Sensor Reference Voltage A Circuit High

38 brands affected · Generic SAE J2012 description.

Key terms: Control module: a small computer that runs one part of the car · SAE J2012: the standard generic code list · Powertrain: engine, transmission and emissions

1What it means in plain English

The engine computer or one of its output circuits has a fault.

2Common causes

Engine control module fault
Power or ground connection problem
Low battery or charging voltage
Wiring short or open circuit
Software or memory fault

3Can I drive?

Serious · drive with care

If the engine runs normally, drive carefully to a workshop for diagnosis. If it runs badly, stalls, or will not restart, have the car towed.

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 38

Brand	Code	Description	System
Ashok Leyland CV	P0643	Hybrid Battery. Electrical Current Sensor. (Sensor B.) - Low Signal Brand	Powertrain
BAIC Motor	P0643	Sensor Reference Voltage A Circuit High Brand	Powertrain
Mercedes-Benz	P0643	Sensor Reference Voltage A Circuit High SAE	Powertrain
BYD	P0643	Sensor reference voltage1 high Brand	Powertrain
Chery	P0643	Sensor Supply Voltage 1 Brand	Powertrain
Chrysler	P0643	RBM fault Brand	Powertrain
Daewoo	P0643	5V Reference Circuit 1 High Voltage Brand	Powertrain
DFFS	P0643	Sensor Reference Voltage A Circuit High Brand	Powertrain
DFFX	P0643	Sensor reference voltage1 high Brand	Powertrain
DFXK	P0643	Sensor Supply Module 1 Fault Brand	Powertrain
EOBD	P0643	Givarreferensspänning 'A' krets hög Brand	Powertrain
Fiat	P0643	Sensor reference voltage 1 circuit high Brand	Powertrain
Geely	P0643	Sensor reference voltage1 high Brand	Powertrain
GM	P0643	Sensor Reference Voltage A Circuit High Brand	Powertrain
Great Wall	P0643	Sensor supply voltage 1 Brand	Powertrain
Hafei	P0643	Sensor reference voltage1 high Brand	Powertrain
Holden	P0643	Sensor Reference Voltage 1 High Voltage Brand	Powertrain
Honda	P0643	Sensor Reference Voltage A Circuit High SAE	Powertrain
Hyundai	P0643	Sensor Reference Voltage A Circuit High SAE	Powertrain
Isuzu	P0643	Sensor Reference Voltage A Circuit High SAE	Powertrain
Land Rover	P0643	Sensor Reference Voltage A Circuit High SAE	Powertrain
Mahindra	P0643	Sensor Reference Voltage A Circuit High SAE	Powertrain
Maserati	P0643	Sensor Reference Voltage 1 Circuit High Brand	Powertrain
Mitsubishi	P0643	Sensor reference voltage1 high Brand	Powertrain
Nissan	P0643	Sensor Reference Voltage A Circuit High SAE	Powertrain
Opel	P0643	Sensor Reference Voltage A Circuit High Brand	Powertrain
Peugeot	P0643	Sensor Reference Voltage A Circuit High SAE	Powertrain
Porsche	P0643	Sensor Reference Voltage A Circuit High SAE	Powertrain
Proton	P0643	Sensor reference voltage1 high Brand	Powertrain
Renault	P0643	Sensor Reference Voltage A Circuit High SAE	Powertrain
Saab	P0643	Sensor Reference Voltage A Circuit High Brand	Powertrain
MG (SAIC)	P0643	Sensor Reference Voltage A Circuit High Brand	Powertrain
Sprinter	P0643	Sensor Reference Voltage A Circuit High SAE	Powertrain
Subaru	P0643	Sensor Reference Voltage A Circuit High SAE	Powertrain
Suzuki	P0643	Sensor Reference Voltage 'A' Circuit High Brand	Powertrain
Tata	P0643	5V Supply 1 Fault -High Brand	Powertrain
Toyota	P0643	Clutch Pump Motor Hall Sensor Supply Voltage 5 Volts 1 Too High Brand	Powertrain
Volkswagen	P0643	Sensor reference voltage A: circuit: high; 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 6

These 7-character codes are manufacturer-specific variants of P0643 and may be reported by some scan tools.

Brand	Code	Description	System
Mercedes-Benz	P064300	Der Ausgang 1 für Referenzspannung der Sensoren hat Kurzschluss nach Plus. Brand	Powertrain
Hyundai	P064300	No description available	Powertrain
SsangYong	P064300	Recovery fault on the external voltage supply Vext Vccs Brand	Powertrain
Mercedes-Benz	P064312	Sensor Reference Voltage 'A' Circuit High Brand	Powertrain
Volvo	P064312	No description available	Powertrain
Mercedes-Benz	P0643E0	Output 1 for the reference voltage of the sensors has a short circuit to positive. Brand	Powertrain

6Related codes

Browse Pxxx codes or P064xx codes.