The P1518 code in your 2021 Ford Edge indicates a malfunction in the Intake Manifold Runner Control (IMRC) system on bank 1. This Ford-specific code signals issues with the variable intake system that optimizes airflow at different engine speeds.
IMRC System Function
The Edge's IMRC uses butterfly valves to change intake runner length. At low RPM, the valves are closed for longer runners (more torque); at high RPM, they open for shorter runners (more power). P1518 indicates bank 1 isn't operating correctly.
Common Causes of P1518
- IMRC actuator motor failure
- Stuck butterfly valves
- Carbon buildup on valves
- Wiring damage to actuator
- IMRC position sensor failure
- Broken linkage or mechanism
Symptoms of IMRC Bank 1 Issues
- Check engine light on
- Reduced power at certain RPM ranges
- Poor fuel economy
- Hesitation during acceleration
- Engine may run rough at certain speeds
- Unusual intake noise
Edge Engine Configuration
The Edge's V6 has IMRC on both banks. P1518 specifically affects bank 1 (passenger side), while bank 2 may operate normally.