AUDI u111300 Trouble Code: Causes and Solutions

Audi DTC U111300 is defined as “Restricted function because of received error value.” It indicates that a control module has received an invalid, implausible, or fault-flagged signal from another module and, as a result, has limited or disabled the affected function. In most cases, U111300 is a secondary fault code that points to an upstream problem rather than a failure of the module in which the code is stored.

Common causes

• Another control module has a primary sensor, actuator, or switch fault.
• Weak 12‑V battery, charging-system problem, poor ground, blown fuse, or defective power-supply relay.
• Damaged wiring, corrosion, loose connectors, or CAN-bus communication problems.
• Incorrect module coding, missing basic settings/calibration, or incompatible software after repairs.
• Faulty wheel-speed, steering-angle, brake, cruise-control, or other shared sensor signals—depending on which module logged the code.

For example, Audi documented U111300 in the engine ECU when the actual problem was a defective cruise-control SET switch/steering-column multi-switch on certain 2012–2013 models. The specified repair was replacement of that switch assembly.

Recommended diagnostic procedure

1. Perform a complete vehicle scan with ODIS, VCDS, or another Audi-capable diagnostic tool. Record which module stored U111300 and all accompanying codes.
2. Diagnose the more specific codes first. Sensor, switch, voltage, relay, or communication codes usually identify the original problem.
3. Test the 12‑V electrical system: battery under load, alternator output, fuses, grounds, Terminal 30 supply, and relevant relays.
4. If multiple unrelated modules have faults, inspect the common power supply and network wiring before replacing any module. Audi has documented a faulty ECM power relay producing U111300 together with numerous unrelated codes.
5. Check relevant live data for implausible sensor or switch values.
6. Inspect connectors and wiring associated with the primary fault; repair corrosion, open circuits, shorts, or poor terminal contact.
7. Complete required coding, basic settings, or calibration after component replacement.
8. Clear the faults, cycle the ignition, road-test the vehicle, and scan it again.

Do not replace an ECU solely because U111300 is present. The exact repair requires the Audi model, year, module address, symptoms, and complete scan report. If ABS, ESC, steering, braking, or driver-assistance warnings are active, have the vehicle diagnosed before normal driving.