PowertrainP0642

Serious

Severity: Serious - have it checked soon

Sensor Reference Voltage A Circuit Low

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	P0642	Sensor Reference Voltage A Circuit Low SAE	Powertrain
BAIC Motor	P0642	Sensor Reference Voltage A Circuit Low Brand	Powertrain
Mercedes-Benz	P0642	Sensor Reference Voltage A Circuit Low SAE	Powertrain
BYD	P0642	TP sensor power supply Brand	Powertrain
Chery	P0642	TP sensor power supply Brand	Powertrain
Chrysler	P0642	RBM fault Brand	Powertrain
Daewoo	P0642	5V Reference Circuit 1 Low Voltage Brand	Powertrain
Daihatsu	P0642	Sensor system power supply fault Brand	Powertrain
DFFS	P0642	Sensor Reference Voltage A Circuit Low Brand	Powertrain
DFFX	P0642	TP sensor power supply Brand	Powertrain
DFXK	P0642	Sensor Reference Voltage A Circuit Low Brand	Powertrain
EOBD	P0642	Anduri viitepinge 'A' vooluring madal Brand	Powertrain
Fiat	P0642	Sensor reference voltage 1 circuit low Brand	Powertrain
Geely	P0642	TP sensor power supply Brand	Powertrain
GM	P0642	Sensor Reference Voltage A Circuit Low Brand	Powertrain
Great Wall	P0642	TP sensor power supply Brand	Powertrain
Hafei	P0642	TP sensor power supply Brand	Powertrain
Holden	P0642	Sensor Reference Voltage 1 Low Voltage Brand	Powertrain
Honda	P0642	Sensor Reference Voltage A Circuit Low SAE	Powertrain
Hyundai	P0642	Sensor Reference Voltage A Circuit Low SAE	Powertrain
Isuzu	P0642	Sensor Reference Voltage A Circuit Low SAE	Powertrain
Land Rover	P0642	Sensor Reference Voltage A Circuit Low SAE	Powertrain
Mahindra	P0642	Sensor Reference Voltage A Circuit Low SAE	Powertrain
Maserati	P0642	Sensor Reference Voltage 1 Circuit Low Brand	Powertrain
Mitsubishi	P0642	TP sensor power supply Brand	Powertrain
Opel	P0642	Sensor Reference Voltage A Circuit Low Brand	Powertrain
Perodua	P0642	Sensor system power supply fault Brand	Powertrain
Peugeot	P0642	Sensor Reference Voltage A Circuit Low SAE	Powertrain
Porsche	P0642	Sensor Reference Voltage A Circuit Low SAE	Powertrain
Proton	P0642	TP sensor power supply Brand	Powertrain
Saab	P0642	Sensor Reference Voltage A Circuit Low Brand	Powertrain
MG (SAIC)	P0642	Sensor Reference Voltage A Circuit Low Brand	Powertrain
Sprinter	P0642	Sensor Reference Voltage A Circuit Low SAE	Powertrain
Subaru	P0642	Sensor Reference Voltage A Circuit Low SAE	Powertrain
Suzuki	P0642	Sensor Reference Voltage 'A' Circuit Low - Circuit Open Brand	Powertrain
Tata	P0642	5V Supply 1 Fault - Low Brand	Powertrain
Toyota	P0642	Clutch pump motor Hall sensor supply voltage 5V 1 too low Brand	Powertrain
Volkswagen	P0642	Sensor Reference Voltage A: Circuit: Low 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 P0642 and may be reported by some scan tools.

Brand	Code	Description	System
Mercedes-Benz	P064200	Sensor Reference Voltage 'A' Circuit Low Brand	Powertrain
SsangYong	P064200	Sensor power supply 1 circuit short to ground Brand	Powertrain
Mercedes-Benz	P064211	Sensor Reference Voltage 'A' Circuit Low Brand	Powertrain
Volvo	P064211	No description available	Powertrain
Volvo	P064216	No description available	Powertrain
Mercedes-Benz	P0642E0	Output 1 for the reference voltage of the sensors has a short circuit to ground. Brand	Powertrain

6Related codes

Browse Pxxx codes or P064xx codes.