NetworkU1803

Serious

Severity: Serious - have it checked soon

Engine oil level information failure

12 brands affected · Description from DFFS data.

Key terms: Control module: a small computer that runs one part of the car

Safety: This code relates to engine oil pressure or oil level. Low oil pressure can destroy the engine within minutes.

1What it means in plain English

Control modules in the car cannot communicate with each other over the vehicle network.

2Common causes

Wiring or connector fault on the communication bus
Faulty control module
Low battery voltage or poor ground
Water ingress in a connector or module
Aftermarket device interfering with the bus

3Can I drive?

Serious · drive with care

The car may run normally or may not run at all. If the module that has lost communication controls steering, brakes, park brake, charging or engine cooling, drive only if those systems feel normal; stop safely if the steering becomes heavy, a brake warning appears, or the engine temperature climbs. If the car will not start or runs badly, have it 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 12

Brand	Code	Description	System
Daewoo	U1803	No description available	Network
DFFS	U1803	Engine oil level information failure Brand	Network
EOBD	U1803	Õlitaseinfo tõrge Brand	Network
GM	U1803	No description available	Network
Holden	U1803	Lost Communication with Hybrid/EV Powertrain Control Module 2 Brand	Network
Honda	U1803	No description available	Network
Mahindra	U1803	No description available	Network
Mitsubishi	U1803	Airbag signal frame error Brand	Network
Opel	U1803	No description available	Network
Peugeot	U1803	No description available	Network
Proton	U1803	Airbag signal frame error Brand	Network
Saab	U1803	No description available	Network

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 Uxxx codes or U180xx codes.