Fault code U2019 – a step-by-step guide to diagnosing and fixing it

The meaning of error code U2019 – Audio Voice Module Not Responding

U2019: Causes, signs and repairs

Error code U2019 is displayed and the check engine light is on - what does this mean?

The DTC U2019 is recognized by the OBD/EOBD system when a communication error occurs in the CAN bus network between different control units. This fault code mainly affects data transmission between the vehicle's electronic modules. Different manufacturers may have slightly different names for this trouble code, but it always refers to network communication problems.

What can cause this fault code?

Defective CAN bus cable or damaged cables
Corroded or loose plug connections on the CAN bus
Faulty control unit in the network
Short circuit or interruption in the bus line
Defective terminating resistors in the CAN system
Power supply problems with individual modules
Electromagnetic interference due to defective components

Which symptoms occur in parallel with error code U2019?

Starting problems: The vehicle is difficult or impossible to start
Functional failures: Various electronic systems are not working properly
Warning lights: Multiple indicator lights in the dashboard come on
Communication error: Diagnostic device cannot communicate with all control units
Irregular engine running: Engine runs irregularly or has loss of power
ESP/ABS problems: Driving assistance systems switch off or function incorrectly

How can I fix the problem with error code U2019?

Repairing error code U2019 requires a systematic diagnosis of the CAN bus system.
Checking all CAN bus plug connections for corrosion and tight fit, cleaning or replacing damaged plugs
Measuring the CAN bus voltage and resistance values with a multimeter, replacing defective terminating resistors
Isolate individual control units by disconnecting the modules step by step to identify the faulty device
Replacing damaged CAN bus cables or repairing cable breaks and short circuits in the cabling
Updating the software of all affected control units to the latest version from the manufacturer
Complete replacement of a defective control unit after clear identification as the source of the fault

FAQ - Frequently asked questions about DTC U2019

Can I continue driving with error code U2019?

Continuing to drive with the code U2019 is not recommended, as important vehicle systems may fail. Road safety could be impaired, especially if ESP or ABS are affected.

How much does it cost to repair fault code U2019?

The repair costs for DTC U2019 vary greatly depending on the cause. Simple connector problems cost 50-100 euros, while replacing a control unit can cost 500-1500 euros.

Can I repair fault code U2019 myself?

You can carry out basic checks such as plug connections yourself. However, diagnosing the CAN bus requires special tools and expertise, which is why a workshop is recommended.

How long does it take to repair error code U2019?

The repair time depends on the source of the fault. Simple connector problems can be rectified in 1-2 hours, while complex CAN bus problems can take several working days.

Will error code U2019 return after the repair?

If the repair was carried out correctly, the EOBD code U2019 should not return. If it returns, the actual cause may not have been rectified or there may be another fault.

Which diagnostic devices recognize error code U2019?

Professional OBD scanners and manufacturer-specific diagnostic devices can read the DTC U2019. Simple code readers may only display "communication error" without providing any details.

Vehicles in which fault code U2019 occurs most frequently

Error code U2019 is a CAN bus communication error and can occur in modern vehicles with complex electronic networks, but is most common in the following vehicles:

BMW: 3 Series, 5 Series, X3, X5 (2005-2015)
Mercedes-Benz: C-Class, E-Class, ML-Class, GLK (2006-2016)
Audi: A4, A6, Q5, Q7 (2007-2017)
Volkswagen: Golf, Passat, Tiguan, Touareg (2008-2018)
Opel: Astra, Insignia, Antara (2009-2019)
Ford: Focus, Mondeo, Kuga, S-Max (2010-2020)
Renault: Megane, Laguna, Scenic (2008-2018)
Peugeot: 308, 508, 3008 (2009-2019)

If the code U2019 occurs in your vehicle, you should first check the vehicle battery, as weak batteries often cause CAN bus problems. However, a professional diagnosis is usually unavoidable, as troubleshooting the CAN bus system requires special knowledge and equipment. Do not ignore this error code, as it can lead to further damage to electronic components.

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