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DTC codes / C06xx · Brakes, steering and suspension / C062F

C062FActive Air Dam Supply Voltage Circuit High

C062F indicates that the control module responsible for the active air dam has detected a voltage on the supply circuit that is higher than the expected range, typically near or above battery voltage when the circuit should be at a lower level. The module sets this code when the supply voltage feedback exceeds its calibrated threshold for a set time, indicating an open circuit, short to voltage, or internal driver fault.

SystemChassis
Code typeGeneric (all makes)
SeverityLow
Fix difficultyIntermediate
AreaBrakes, steering and suspension

Symptoms you may notice

  • The active air dam may remain in the deployed position at all times, reducing ground clearance and possibly causing scraping on steep driveways.
  • A warning light or message on the dashboard indicating a fault with the active air dam or aerodynamic system.
  • The air dam may fail to deploy or retract when commanded, leaving it stuck in one position.
  • Often no symptoms besides the warning light, as the air dam is a fuel-saving feature and does not affect engine operation.
  • Possible slight decrease in fuel economy at highway speeds if the air dam remains deployed.
  • In some vehicles, other driver assistance or aerodynamic features may be disabled as a precaution.

Common causes, most likely first

  1. An open circuit in the supply voltage wire to the active air dam actuator, such as a broken wire or disconnected connector.
  2. A short to voltage on the supply circuit, often caused by chafed wiring contacting a higher-voltage source.
  3. A faulty active air dam actuator with an internal open or high-resistance fault.
  4. Corroded or damaged connector pins at the actuator or control module, leading to high resistance.
  5. A malfunctioning control module that incorrectly interprets the supply voltage or has an internal driver fault.
  6. Aftermarket accessories or improper wiring repairs that backfeed voltage into the supply circuit.

How to diagnose and fix it

  1. Verify the code with a scan tool and check for any related codes in other modules to confirm the fault is isolated to the active air dam supply circuit.
  2. Inspect the wiring harness and connectors at the active air dam actuator for signs of damage, corrosion, or loose pins, repairing as necessary.
  3. Measure the supply voltage at the actuator connector with the key on and the air dam commanded to move, comparing it to the manufacturer's specification.
  4. Check for continuity and resistance in the supply wire between the control module and the actuator to rule out an open circuit.
  5. Test for a short to voltage on the supply circuit by measuring voltage with the actuator disconnected and the module commanding the circuit off.
  6. If the wiring and connectors are good, substitute a known-good actuator to see if the code clears, confirming whether the actuator is at fault.
  7. If the actuator and wiring test good, diagnose the control module for internal faults, following the manufacturer's diagnostic flow chart before replacement.

Active Air Dam Supply Circuit Quirks

  • A common oversight is assuming the actuator is defective when the real problem is a chafed supply wire rubbing against a metal bracket, causing an intermittent short to voltage.
  • The code can be set by a weak or failing battery if the module sees supply voltage spikes during engine start, so always check battery condition and charging system first.
  • Some vehicles require the active air dam to be reinitialized or calibrated after repairs, and skipping this step can cause the code to return even with good components.
  • The supply voltage circuit may share a ground with other body components, so a poor ground can cause voltage readings to appear high on the supply side, leading to misdiagnosis.
  • This code does not always mean the air dam is physically broken; it can be stored due to a temporary voltage spike from jump-starting or improper battery charging.

Can I keep driving with C062F?

It is generally safe to continue driving with this code because the active air dam is an aerodynamic aid and does not affect engine performance or safety. Avoid high-speed driving if the air dam is stuck deployed, as it may reduce fuel economy and increase the risk of damage over speed bumps.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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