NetworkU3017

Serious

Severity: Serious - have it checked soon

Control Module Timer/Clock Performance

13 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

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 13

Brand	Code	Description	System
Ashok Leyland CV	U3017	Control Module Timer/Clock Performance SAE	Network
Mercedes-Benz	U3017	Control Module Timer/Clock Performance SAE	Network
Daewoo	U3017	Control Module Timer/Clock Performance SAE	Network
EOBD	U3017	Styreenhed timer/ur ydeevne Brand	Network
GM	U3017	Control Module Timer/Clock Performance SAE	Network
Holden	U3017	Control Module Timer/Clock Performance SAE	Network
Isuzu	U3017	Control Module Timer/Clock Performance SAE	Network
Land Rover	U3017	Control Module Timer/Clock Performance SAE	Network
Opel	U3017	Control Module Timer/Clock Performance SAE	Network
Peugeot	U3017	Control Module Timer/Clock Performance SAE	Network
Porsche	U3017	Control Module Timer/Clock Performance SAE	Network
Saab	U3017	Control Module Timer/Clock Performance SAE	Network
Toyota	U3017	Control module timer/clock performance Brand	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.

5Extended variant codes 10

These 7-character codes are manufacturer-specific variants of U3017 and may be reported by some scan tools.

Brand	Code	Description	System
Mercedes-Benz	U301700	Control Module Timer/Clock Performance Brand	Network
Mercedes-Benz	U301702	Control Module Timer/Clock Performance General Signal Error Brand	Network
Mercedes-Benz	U301704	Control Module Timer/Clock Performance Brand	Network
Mercedes-Benz	U301709	The real-time internal control unit clock has a malfunction. Component Failure. Fault detected in mP clock frequency Brand	Network
Mercedes-Benz	U3017E0	The real-time internal control unit clock has a malfunction. PLL clock deviations Brand	Network
Mercedes-Benz	U3017E1	No description available	Network
Mercedes-Benz	U3017E5	The real-time internal control unit clock has a malfunction. Peripheral clock. Per PLL loss of lock Brand	Network
Mercedes-Benz	U3017FA	The real-time internal control unit clock has a malfunction. Brand	Network
Mercedes-Benz	U3017FB	The real-time internal control unit clock has a malfunction. Brand	Network
Mercedes-Benz	U3017FF	Aurix (Master Controller) recovery timer fault Brand	Network

6Related codes

Browse Uxxx codes or U301xx codes.