Fault code U1113 – a step-by-step guide to diagnosing and fixing it

The meaning of error code U1113 – SCP (J1850) Invalid or Missing Data for Primary Id

U1113: Causes, signs and repairs

Error code U1113 is displayed and the check engine light is on - what does this mean?

The DTC U1113 is a network-related error code that is recognized by the OBD/EOBD system when there is a communication error in the CAN bus system. This trouble code indicates problems with data transmission between different control units. This fault code may have different names for different manufacturers, but basically refers to communication faults in the vehicle network.

What causes can this fault code have?

Defective CAN bus wiring
Damaged or corroded plug connections
Failed control unit in the network
Short circuit in the bus line
Interrupted earth connections
Defective terminating resistors in the CAN bus
Malfunctions due to electromagnetic interference
Faulty gateway modules
Faulty fuses in the power supply

What symptoms occur in parallel with error code U1113?

Communication error: Different systems cannot communicate with each other
Functional failures: Certain vehicle functions are not working properly
Warning lights: Multiple indicator lights may illuminate simultaneously
Starting problems: The vehicle may exhibit starting difficulties
System errors: Infotainment or air conditioning system malfunctions
Diagnostic error: other error codes may be stored incorrectly

How to fix the problem of error code U1113?

Correcting the U1113 code requires a systematic diagnosis of the CAN bus system.
Check the CAN bus cabling and completely replace damaged cables, paying particular attention to chafing points and cable breaks
Clean all plug connections in the network, check for corrosion and treat with contact spray or replace defective plugs
Test control units individually and replace failed modules completely, also checking the software versions
Check earth connections and clean loose or corroded earth points and tighten them firmly
Measure terminating resistors in the CAN bus with a multimeter and replace defective resistors with new ones
Diagnose gateway module and replace and reprogram the entire module if defective

FAQ - Frequently asked questions about DTC U1113

Can I continue driving with error code U1113?

It is only possible to continue driving with code U1113 to a limited extent. As this is a communication error, important safety systems may be impaired. A prompt repair is strongly recommended.

How much does it cost to repair error code U1113?

The repair costs for the U1113 code vary greatly depending on the cause. Simple cable repairs cost 50-150 euros, while replacing control units can cost 300-800 euros.

How long does it take to diagnose the U1113 error code?

Diagnosing the U1113 code can take 1-3 hours, as the entire CAN bus system must be systematically checked. More complex cases may take longer.

Can the U1113 error code be caused by a software error?

Yes, the U1113 code can be caused by outdated or faulty software in the control units. A software update can solve the problem in such cases.

What tools do I need to diagnose the U1113 code?

To diagnose the U1113 code, you need a professional OBD diagnostic device, a multimeter, oscilloscope and special CAN bus test devices for a complete network analysis.

Does the U1113 error code occur frequently?

The U1113 code is a relatively rare EOBD fault code that mainly occurs in older vehicles or after improper repairs to the electrical system.

Vehicles in which fault code U1113 occurs most frequently

Error code U1113 is a network-specific DTC and can occur in various vehicle brands that use CAN bus systems, but is most common in the following vehicles:

BMW: 3 Series, 5 Series, X3, X5 (2005-2015)
Mercedes-Benz: C-Class, E-Class, S-Class, ML-Class (2006-2014)
Audi: A4, A6, Q5, Q7 (2005-2013)
Volkswagen: Golf, Passat, Tiguan, Touareg (2007-2016)
Ford: Focus, Mondeo, Kuga, Explorer (2008-2017)
Opel: Astra, Insignia, Zafira (2009-2018)
Peugeot: 308, 508, 3008 (2010-2019)
Renault: Megane, Laguna, Scenic (2008-2016)

If code U1113 occurs in your vehicle, you should not hesitate to visit a specialist workshop. CAN bus problems can affect various vehicle systems and impair driving safety. A professional diagnosis is essential to identify the exact cause and ensure a permanent solution. Do not attempt to repair complex network problems yourself, as this can lead to further damage.

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