What does code P1777 mean on Land Rover vehicles?
A fault has been detected in the ignition retard request signal line between the transmission and engine control modules.
OBD-II Code Land Rover
P1777 — Land Rover — Gearbox Ignition Retard Request Line Fault
A fault has been detected in the ignition retard request signal line between the transmission and engine control modules.
Common symptoms
- Harsh shifting
- abnormal gear changes
Possible causes
- CAN bus wiring fault
- signal line failure
Initial recommendation
Check CAN bus wiring and ignition retard request circuit.
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 P1777 with your vehicle's actual symptoms for more complete diagnostic guidance.
Go to the app View more brands