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2015 KIA FORTE
1.8L I4•FWD•AUTOMATIC•gas•G4NB
1 active safety recall on this vehicle — view recalls🏆Sponsored by Simon-Olivier Ricci
Repairs401Labor494Torque3387Fluid7DTC1833Battery1Maintenance0Recalls1
C0420high severityChassis

Pre-Collision System Malfunction

on 2015 Kia Forte 1.8L I4 · FWD

What this code means

General fault in the pre-collision system that prepares or initiates emergency braking.

Symptoms

  • Pre-collision system warning light
  • Automatic emergency braking disabled
  • Forward collision alert unavailable
  • Driver assist systems degraded

Common causes

  • Radar or camera sensor fault
  • Control module failure
  • Brake system fault preventing intervention
  • CAN communication error between modules

Diagnostic steps

  1. Check for radar and camera codes first
  2. Verify brake system is fully operational
  3. Test CAN communication between PCS modules
  4. Check all sensor alignments
  5. Inspect wiring to PCS components

Repair notes

Diagnose root sensor or communication fault. PCS depends on multiple subsystems.

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