DTC U0100-87: Lost Communication With ECM/PCM "A" - Missing message: Action

WARNING: This page is about a different car, the 2023 Jaguar F-Pace and 2022 Jaguar F-Pace. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Do NOT replace the anti-lock brake system control module for this DTC only

Make sure that all ECUs of the vehicle are connected to the network. Refer to the electrical circuit diagrams and check the FlexRay circuit for short circuit to ground, short circuit to power, open circuit, high resistance. Repair the wiring harness as required
Refer to the electrical circuit diagrams and check the powertrain control module power and ground circuits for open circuit, high resistance. Repair the wiring harness as required
Perform an ignition cycle, clear the DTC and retest, if the problem persists contact JLR technical assistance