Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means there's a problem with a part of the car that helps control air flow to make the car more efficient. It's like a flap that opens and closes, and it's not working right now.
The Active Air Dam is a component that adjusts to improve aerodynamics and fuel efficiency. This code indicates that the electrical circuit controlling this component is reporting a low voltage condition.
The C0602 code is triggered when the vehicle's control module detects a low voltage condition in the active air dam control circuit. This could be due to a wiring issue, a faulty control module, or a problem with the air dam motor itself.
• Check engine light is on
• Reduced fuel efficiency
• Unusual aerodynamic noise
• Faulty active air dam motor
• Damaged wiring or connectors in the circuit
• Faulty control module
Active Air Dam: A component that adjusts to improve vehicle aerodynamics.
Control Module: An electronic device that manages various functions in the vehicle.
• Inspect the wiring and connectors for damage
• Test the voltage at the active air dam motor
• Check the control module for faults
• Repair or replace damaged wiring
• Replace the active air dam motor
• Reprogram or replace the control module
• Multimeter
• OBD-II scanner
• Screwdriver set
$150 - $500
Moderate
• Chevrolet Silverado
• GMC Sierra
• Cadillac Escalade
• Regular inspection of wiring and connectors
• Routine maintenance checks
• Avoiding harsh driving conditions
Sensor Issue
• Have the vehicle inspected by a professional
• Avoid high-speed driving until repaired
Check with your vehicle manufacturer for warranty coverage on emissions-related components.
This code has been more common in vehicles with advanced aerodynamic features introduced in the last decade.
Moderate – While not immediately critical, it should be addressed to maintain fuel efficiency and vehicle performance.
Ignoring this issue may lead to reduced fuel efficiency and potential emissions non-compliance.
• Vehicle at operating temperature
• Stationary with engine running
The active air dam is located at the front of the vehicle, typically below the bumper.
Q: Can I drive with a C0602 code?
A: Yes, but it's best to get it checked soon to avoid reduced fuel efficiency.
Q: Is this a common issue?
A: It's not extremely common but can occur in vehicles with active aerodynamic features.
Pro · Four-system diagnostics
A handheld scanner aimed at engine, transmission, ABS, and airbag diagnostic work.
Chassis and ABS faults usually need a scanner that can read brake-system data directly.
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Universal · Torque wrench
Useful when reassembly torque matters for wheel, suspension, and under-hood fasteners.
Useful when wheel, hub, or suspension hardware needs correct reassembly torque.
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Universal · Drive-on ramps
Helpful for safer access underneath the vehicle during exhaust, EVAP, and underbody inspection work.
Helpful for safer access during underbody inspection work.
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