B1608-87: 12V Li-ion battery communication fault - Missing message: Action

NOTE: Before continuing, use the Jaguar Land Rover approved diagnostic equipment to clear the Diagnostic Trouble Codes and retest. If this DTC reappears follow the help text below

Inspect the integrity of the 12v Lithium-ion startup battery connector, repair as necessary. Using the Jaguar Land Rover approved diagnostic equipment, clear the Diagnostic Trouble Code(s) and retest
Refer to the electrical circuit diagrams and inspect the LIN bus circuit between the Gateway Module and the 12v Lithium-ion startup battery for short circuit to ground, short circuit to power, open circuit, high resistance. Repair the wiring harness as necessary. Using the Jaguar Land Rover approved diagnostic equipment, clear the Diagnostic Trouble Code(s) and retest
If the fault persists, install a new 12v Lithium-ion startup battery as necessary