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Home / DTC / C0602 — Active Air Dam Control Circuit Low

C0602 — Active Air Dam Control Circuit Low

Detailed page for trouble code C0602.

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C0602

Generic C — Chassis

Active Air Dam Control Circuit Low

Brand: Generic
Type: C — Chassis
Views: UK: 18 EN: 30 RU: 14
AI status
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Page language: EN

Causes

  • Broken or shorted wiring between control module and air dam actuator
  • Poor or corroded connector or pin (open or high resistance)
  • Blown fuse or faulty relay in the air dam/auxiliary circuit
  • Failed actuator (motor, solenoid or position sensor)
  • Weak battery or poor system ground
  • Control module driver/transistor failure

Symptoms

  • DTC C0602 stored and MIL/Service light may be illuminated
  • Active air dam does not open or close on command
  • Air dam moves slowly or intermittently
  • Unusual noise from the actuator area or humming under load
  • Possible reduced highway aero efficiency or cold-air flap stuck position

What to check

  • Read stored and pending codes and freeze frame with a scan tool; note related codes.
  • Verify battery voltage (key ON) is within normal range (11–14.5 V).
  • Visually inspect air dam actuator, linkage and mounting for mechanical binding or damage.
  • Inspect wiring and connectors for corrosion, damage, pin push-out, or water ingress.
  • Check relevant fuses and relays for continuity and proper operation.
  • Backprobe actuator connector while commanding the dam with a scan tool to observe voltage and signal behavior.

Signal parameters

  • Rest/idle (command OFF): control circuit may be near 0 V (driver off) or held at ground by driver.
  • Command ON: supply voltage expected near battery (≈11–14.5 V) at actuator power pin when energized.
  • If module uses PWM: duty cycle varies; frequency commonly in the 10–200 Hz range depending on design.
  • Low condition: voltage significantly below battery (e.g.,
  • Actuator resistance: small DC motor may measure low ohms (single-digit to tens of ohms); solenoids may be higher—refer to vehicle spec.

Diagnostic algorithm

  1. Verify the code: Connect a scan tool, record codes, freeze frame and live data; clear codes and attempt to reproduce.
  2. Visual and mechanical: Inspect the air dam assembly, actuator and linkage for binding, obstructions or damage. Manually operate if safe to confirm freedom of movement.
  3. Power/Ground checks: With ignition ON, check battery voltage at harness and verify a good ground at actuator ground terminal.
  4. Connector inspection: Disconnect actuator connector; inspect pins for corrosion, bent pins, or water intrusion. Clean and repair as needed.
  5. Voltage measurement: Backprobe power and control pins at the actuator while commanding the dam open/close with the scan tool. Expect near-battery voltage on the supply when commanded. If voltage is low, trace upstream.
  6. Resistance/current check: Measure actuator coil/motor resistance. If unusually low (short) or open, replace actuator. If high current draw is suspected, measure current while actuating (clamped meter) and compare to spec.
  7. Wiring continuity: Check continuity between module connector and actuator connector; check for short to ground or short to battery on the power/control circuits.
  8. Fuse/relay: Verify any inline fuse and relay operation in the circuit; replace if blown or faulty.
  9. Module driver check: If wiring and actuator check good, verify the control module output. Some modules can be commanded to actuate outputs while measuring; if the module output is low/absent while commanding and wiring is good, suspect module driver failure.
  10. Repair and verify: Repair or replace faulty wiring, connector, fuse, relay or actuator as indicated. After repair, clear codes and confirm proper operation through multiple command cycles and road test if required.

Likely causes

  • Corroded connector at the air dam actuator
  • Open or short to ground in the actuator power lead
  • Faulty air dam actuator motor drawing excessive current
  • Blown inline fuse protecting the actuator circuit
  • Failed low-side/high-side driver inside the control module

Fault status

⚠️ Status
Active Air Dam Control Circuit voltage below expected threshold — module detected a low (short/low-voltage) condition on the air dam control circuit.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

C0600 C0601 C0603 C0604 C0605
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