The code is defined as: "Battery Voltage Low / Supply Voltage Circuit Low."
Modern Land Rovers are notoriously voltage-sensitive. If your battery drops below 11.8V during cranking or while the ARC module is initializing, the module’s internal checksum fails, logging C1D18-00. Replacing a 5-year-old AGM battery often resolves this code without further repair. land rover c1d18-00
Because "Internal Electronic Failure" is broad, many mechanics jump to replacing the ARC module ($2,000–$4,000). However, data from Land Rover technical bulletins shows that C1D18-00 can stem from several sources: The code is defined as: "Battery Voltage Low
If the fault persists, use the following guide to identify the root cause: the module’s internal checksum fails
The system should automatically detect and assign the sensor positions during this drive. Troubleshooting & Diagnostic Guide