Audi U111300 Meaning - Received Malfunction Value in VAG Diagnostics

User question

What is Audi U111300?

Artificial Intelligence Response

Direct answer to the question

Audi U111300 is a VAG/Audi diagnostic trouble code that is most accurately described as “Function limitation due to received malfunction value”; Audi service literature also phrases it as “Restricted function because of received error value.” In plain terms, a control module is limiting or disabling a function because another module sent bad, implausible, or fault-related data. It is usually a secondary/cascade fault, not the original failed part. (static.nhtsa.gov)

Key points

• It usually means “something upstream is wrong”, not necessarily that the module storing U111300 is defective. (static.nhtsa.gov)
• The real cause is often found in another DTC in another module, such as a switch, sensor, relay, power-supply, or network-related issue. (static.nhtsa.gov)
• So, do not replace parts based on U111300 alone. Diagnose the primary fault first. (static.nhtsa.gov)

Detailed problem analysis

A useful way to interpret U111300 is: “this module received a fault value from elsewhere, so it restricted its own function.” Audi’s own 2013 service bulletin shows exactly that pattern: the engine control module stored U111300, while the real underlying problem was the cruise-control set switch / steering-column electronics issue. That is strong evidence that U111300 is often a symptom of another fault, not the root cause. (static.nhtsa.gov)

Audi’s 2018 bulletin on no-start conditions makes the same point from a different angle. When the ECM power-supply relay malfunctioned, the vehicle logged numerous unrelated DTCs, including U111300, across multiple systems. Audi explicitly states that when the relay is not functioning properly, multiple control modules can generate faults. That means power-distribution problems can easily create U111300 as a byproduct. (static.nhtsa.gov)

From an electronics/network perspective, this is consistent with how modern Audis are built: many ECUs depend on shared data rather than standalone sensors. If one node supplies corrupt or implausible data, dependent modules enter a restricted state for safety and plausibility reasons. That is why U111300 often appears with comfort, drivetrain, ADAS, or brake-related complaints rather than pointing to one single failed component. This is an engineering inference, but it is directly supported by Audi’s examples of switch faults, relay faults, and cross-module error propagation. (static.nhtsa.gov)

Current information and trends

Recent Audi/VW Group service documents continue to use closely related fault concepts such as “data bus, received error value” and implausible message/supply-voltage faults in multiple control units. That indicates the pattern is still current on newer platforms: with increasingly networked ADAS, body, infotainment, and energy-management systems, secondary communication-value faults are becoming more common, especially when the original issue is power-supply, sensor plausibility, or module-software related. (static.nhtsa.gov)

Supporting explanations and details

A practical analogy: think of U111300 as a “bad data received” reaction, not a direct declaration of hardware failure. If Module A depends on a signal from Module B, and Module B reports an error or sends implausible data, Module A may log U111300 and disable a feature. Audi’s cruise-control bulletin is a concrete example: a switch-related problem upstream led to U111300 being stored in the engine controller. (static.nhtsa.gov)

Another realistic upstream source is a speed-signal or plausibility issue. Audi’s 2023 ABS/ESC bulletin notes that contaminated ABS speed sensors or sensor rings can generate implausible rotational-speed signals, and Audi instructs technicians to inspect/clean those parts and then continue diagnosis through Guided Fault Finding. While that bulletin does not name U111300 specifically, it supports the broader diagnostic principle that bad sensor data in one subsystem can trigger dependent-system restrictions elsewhere. (static.nhtsa.gov)

Ethical and legal aspects

If U111300 appears together with ABS, ESC, steering, braking, or ADAS warnings, treat the vehicle as potentially safety-relevant until the primary fault is identified. The code itself is not a legal issue, but ignoring the underlying cause could leave important driver-assistance or stability functions degraded. That is an engineering safety recommendation based on the fact that Audi bulletins tie these fault families to control-system restrictions and implausible input conditions. (static.nhtsa.gov)

Practical guidelines

1. Run a full vehicle scan, not just an engine scan.
   U111300 is often secondary, so the important clue is usually another, more specific DTC in a different module. (static.nhtsa.gov)

2. Prioritize the primary fault over U111300.
   If you also have a switch, sensor, supply-voltage, relay, or terminal-related code, that is usually where diagnosis should begin. (static.nhtsa.gov)

3. Check power supply first.
   Audi documentation shows relay and supply-voltage faults can create large numbers of secondary DTCs, including U111300. (static.nhtsa.gov)

4. If brake/speed-related faults are present, inspect ABS speed sensors and tone/sensor-ring areas.
   Dirt, grease, or debris can distort the signal and create implausibility faults. (static.nhtsa.gov)

5. Clear faults only after repairs, then retest.
   Audi’s service flow repeatedly points back to guided diagnosis and validation after correcting the primary issue. (static.nhtsa.gov)

Possible disclaimers or additional notes

Some offline descriptions of U111300 reduce it to “loss of communication.” That is too broad. Audi’s own wording is closer to received error/malfunction value, which is more specific: the problem is often bad or fault-flagged data, not necessarily total communication loss. (static.nhtsa.gov)

Also, the meaning in practice depends on which module logged it. The same U111300 can appear in different contexts—engine, body, assistance, or other modules—because it describes a reaction to another problem, not one unique failed part. (static.nhtsa.gov)

Suggestions for further research

If you want a precise diagnosis, the next useful inputs are:

• Audi model and year
• The full scan log
• Which module stored U111300
• Any accompanying DTCs
• Whether there are warnings for ABS/ESC/ACC/steering/start system (static.nhtsa.gov)

Brief summary

Audi U111300 means the module has limited function because it received a fault-related/implausible value from another module. It is typically a secondary networked-system code, not the direct root cause. In practice, diagnose the other stored codes, power supply, relays, and relevant sensor inputs first. (static.nhtsa.gov)

If you want, paste your full Audi scan report and I can help identify the actual root fault behind U111300.

Disclaimer: The responses provided by artificial intelligence (language model) may be inaccurate and misleading. Elektroda is not responsible for the accuracy, reliability, or completeness of the presented information. All responses should be verified by the user.