C0603Active Air Dam Control Circuit High
- Generic OBD-II code · Chassis
- How the car detects it
- With C0603 the air dam control circuit reads above its permitted level, which points to a lead shorted to battery voltage or to another powered wire in the front-end harness. Motor driver ICs like the DRV8873-Q1 list a short to battery as a separate protected fault and disable the affected output. GM's patent on air dam self-diagnosis compares commanded position with measured position and motor current, which lets the controller tell a wiring problem from a blocked or broken panel. No maker documents C0603 publicly. Ram's X96 warranty extension for 2019 Ram 1500 trucks shows that air dam faults can light the MIL there, but that case is the lost-communication code U0645. Expect a stationary panel and a system message.
- What you may notice
- Air dam system fault message
- Air dam does not deploy at highway speed
- Possible blown fuse for the air dam circuit
- Likely causes
- LikelyControl wire shorted to a battery-fed wire in the front harness
- PossibleFault in the actuator electronics holding the line high
- RareWrong pin assignment or splice after a previous bumper or harness repair
- Repair
- Medium · Often possible to do yourself.Typical cost: €30 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.