Chassis, generic

C0602 Active Air Dam Control Circuit Low

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

C0602 says the control line to the air dam actuator is held below its expected voltage, most often because a motor lead touches ground or because water has bridged pins in the connector. Smart H-bridge drivers such as the DRV8873-Q1 see a grounded output as overcurrent, trip within a few microseconds and turn that half-bridge off, so the motor never gets drive. For a 2025 Ram 1500 with air dam codes, Stellantis has technicians look for corrosion, cut or chafed wires and excess resistance before replacing the dam. Ford fits separate left and right actuators on the F-150, so one side can be at fault alone. No maker documents C0602 itself. The panel stops moving and a warning text may show; high and open faults are C0603 and C0601.

Likely causes

Actuator wire chafed through and touching the body or frame
Water and corrosion in the actuator connector after a damaged seal
Shorted motor or electronics inside the actuator

Symptoms

  • Air dam warning message in the instrument cluster
  • Air dam stays in one position
  • Fault returns as soon as the system commands movement

Repair estimate

DifficultyMediumDIY possible
Parts and labour€30–600
Time0.5–2.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

active air dam actuatoractive air dam module

Related codes

C0601C0603C0604C062E

References: ti.com, static.nhtsa.gov, static.nhtsa.gov, patents.google.com.