What it means
A control module received data from Drive Motor Control Module A that it judged invalid or implausible. This code identifies the rejected data, but does not by itself identify the cause.
How it works
Drive Motor Control Module A reports operating data for drive motor A to other vehicle modules over the network. U0411 sets when a receiving module judges that data implausible and rejects it; the code does not by itself identify a motor or battery failure.
Common causes
Most likely first.
- Fault or implausible input at Drive Motor Control Module A
- Damaged or loose network wiring or connector
- Module power, ground, or programming issue
Symptoms
- Hybrid or EV warning message
- Drive motor functions may be limited
- Other communication codes
How to diagnose it
- Scan all modules and save freeze-frame data to identify the receiving module and any drive motor A, hybrid/EV, or network codes logged with U0411.
- Check the instrument-panel messages and live data for drive motor A status, power limits, or unavailable values.
- Inspect accessible low-voltage connectors and network wiring for the drive motor control module for looseness, corrosion, or damage; do not disturb high-voltage components.
- Check the module's low-voltage power and ground circuits against the manufacturer's specification.
- Compare drive motor A reported values with related module data using a scan tool capable of hybrid or EV diagnostics.
- If wiring and power are sound, verify module configuration and software and check network communication using the manufacturer's procedure.
Common fixes
- Repair damaged or corroded low-voltage wiring or connector terminals to drive motor control module A.
- Repair a faulty low-voltage power or ground connection found during testing.
- Correct module A software or configuration incompatibility.
- Replace drive motor control module A only if testing confirms an internal fault.
Can I keep driving?
If a hybrid or EV warning appears, power is limited, or the vehicle behaves unpredictably, stop in a safe place and arrange appropriate service. Do not handle high-voltage components; continued driving could leave you without expected drive power.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.