DTC U0401-86: Invalid Data Received From ECM/PCM A - Signal invalid: Action
WARNING: This page is about a different car, the 2015 Land Rover LR2, 2014 Land Rover LR2, and 2013 Land Rover LR2. However, it is still accessible from the selected car via links, so may be relevant.
- Using the manufacturer approved diagnostic system, check engine control module, for related DTCs and refer to the relevant DTC index
- Using the manufacturer approved diagnostic system, complete a CAN network integrity test
- Cycle the ignition off, then on, and check if the DTC is still logged
- Clear the DTC and retest