Module Transmitted Invalid Data (Non SCP)
A module in your vehicle sent data to another module that doesn't make sense or follows an invalid format—like sending a text message in gibberish that the receiver can't understand. This prevents proper communication between computer systems and can cause drivability issues.
The ECU monitors serial communication protocols (non-SCP) between modules for valid data packets with correct checksums and format. When a module transmits data that violates expected structure, bit patterns, or validation rules, the receiving module rejects it as invalid.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Data Packet Checksum | Calculated checksum matches received checksum | Checksum mismatch or invalid bit sequence detected |
| Message Format Validity | Data structure conforms to protocol specification | Malformed packet or out-of-range parameter values |
Code U2011 is a low-severity fault. Your vehicle is generally safe to drive to a workshop for diagnosis. However, do not ignore it indefinitely — low-severity codes often indicate developing problems that become expensive if neglected. Book a diagnostic appointment within 2–4 weeks. If you notice any additional symptoms (rough running, power loss, unusual smells), treat it as higher priority.
Once the fault is repaired, U2011 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.