What does code P1621 mean on Land Rover vehicles?
The ECU has lost communication on the serial data link, affecting multiple control modules.
OBD-II Code Land Rover
P1621 — Land Rover — Serial Data Link Dead Fault
The ECU has lost communication on the serial data link, affecting multiple control modules.
Common symptoms
- Multiple warning lights
- communication errors
- drivability issues
Possible causes
- CAN bus failure
- wiring fault
- module communication loss
Initial recommendation
Perform complete CAN bus diagnostics and inspect network wiring.
Safety notice
This information is for guidance only. Brand-specific codes may vary by model, year, engine, transmission and vehicle configuration. It does not replace a physical inspection or diagnosis by a qualified mechanic. If the vehicle is unsafe to operate, avoid driving it and seek professional inspection.
Analyze this code with MecaOBD
Use the app to combine Land Rover code P1621 with your vehicle's actual symptoms for more complete diagnostic guidance.
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