PowertrainP1641

Caution

Severity: Caution - get it checked when you can

Main relay malfunction

29 brands affected · Description from Land Rover data.

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?

Caution · drive with care

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 29

Brand	Code	Description	System
Ashok Leyland CV	P1641	Coolant Temperature Sensor. Intercooler. Sensor B. Operation Failure Brand	Powertrain
Mercedes-Benz	P1641	No description available	Powertrain
BYD	P1641	Fuel pump pressure sensor fault Brand	Powertrain
Chery	P1641	No description available	Powertrain
Chrysler	P1641	No description available	Powertrain
Daewoo	P1641	MIL Ctrl Circ Brand	Powertrain
Daihatsu	P1641	Communication fault 2 Brand	Powertrain
DFXK	P1641	No description available	Powertrain
EOBD	P1641	Juhtseade Brand	Powertrain
Geely	P1641	No description available	Powertrain
GM	P1641	No description available	Powertrain
Great Wall	P1641	External sensor reference supply voltage 1 out of range Brand	Powertrain
Holden	P1641	Control Module Internal Failure Brand	Powertrain
Honda	P1641	No description available	Powertrain
Hyundai	P1641	No description available	Powertrain
Land Rover	P1641	Main relay malfunction Brand	Powertrain
Mahindra	P1641	No description available	Powertrain
Maserati	P1641	No description available	Powertrain
Mitsubishi	P1641	Injector / DCDC converter SW Brand	Powertrain
Opel	P1641	MIL Ctrl Circ Brand	Powertrain
Perodua	P1641	Communication fault 2 Brand	Powertrain
Peugeot	P1641	No description available	Powertrain
Porsche	P1641	No description available	Powertrain
Proton	P1641	Injector / DCDC converter SW Brand	Powertrain
Saab	P1641	MIL Ctrl Circ Brand	Powertrain
Sprinter	P1641	No description available	Powertrain
Suzuki	P1641	Additional Heater Relay No.1 Control Circuit Brand	Powertrain
Tata	P1641	5V Supply #1 Fault Brand	Powertrain
Toyota	P1641	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.

5Related codes

Browse Pxxx codes or P164xx codes.