Code
C0630
Generic
C — Chassis
Active Air Dam Stuck
AI status
Completed
Completed
100%
Causes
- Mechanical obstruction or binding of the air dam linkage
- Failed actuator motor or internal gearbox
- Damaged or worn position sensor (potentiometer or hall sensor) inside actuator
- Open or shorted wiring, corroded or disconnected connector
- Blown fuse or relay in the air dam power circuit
- Faulty body control module (BCM) or actuator driver circuit
Symptoms
- Air dam remains in one position (stuck open or stuck closed)
- Warning light or message related to air dam/aerodynamics
- Reduced fuel economy or wind noise when air dam is stuck open
- Intermittent operation or slow movement of the air dam
- DTC stored and fault indicator may return after clear
What to check
- Read and record all related DTCs and freeze-frame data with a scan tool
- Visually inspect the air dam, linkage and mounting for binding, damage or foreign objects
- Verify fuse(s) and relay(s) for the air dam circuit are intact
- Inspect connectors for corrosion, water intrusion, and bent pins at actuator and control module
- Check supply voltage and ground at the actuator connector with key ON and during operation
- Perform resistance and continuity checks on actuator wiring to the module
Signal parameters
- Actuator supply voltage: nominal battery voltage (~12 V) with key ON and during commanded movement
- Actuator ground continuity and low resistance to chassis ground
- Position feedback voltage: typical 0–5 V (varies with position) or specified sensor signal
- Motor current draw: normal running current vs stalled (amps)
- Resistance of position sensor and motor windings (ohms)
- CAN/ LIN messages: actuator command and status frames (if networked)
Diagnostic algorithm
- Retrieve and document DTC(s) and freeze-frame with a diagnostic scan tool. Note conditions (temp, key state, speed).
- Attempt a simple actuator cycle using the scan tool while observing and listening. If it moves intermittently, note behavior.
- Visually inspect the air dam assembly for physical obstruction, damage, or foreign material preventing motion. Manually check if it can be moved by hand (vehicle secure, ignition OFF).
- Check fuses and relays for the air dam circuit; replace if blown and re-test.
- With ignition ON, measure supply voltage and ground at the actuator connector. If no supply or ground, trace back to fuse, relay, or BCM.
- Backprobe the position feedback pin while commanding the actuator. Verify feedback changes smoothly across full travel. Erratic or no change suggests sensor or wiring fault.
- Measure motor current while commanding movement. A very high/stalled current indicates mechanical binding or seized motor; near-zero current with proper command suggests open circuit or driver fault.
- Inspect wiring harness for chafe, breaks, or corrosion and perform continuity checks to the module. Repair any damaged wiring/connectors.
- If wiring and power are good but actuator doesn’t respond or feedback is invalid, remove and bench-test the actuator (follow vehicle-specific service manual). Replace actuator if internal failure is confirmed.
- If actuator and wiring appear good, check BCM/module outputs and communication. Test or replace module only after confirming external components and wiring.
- After repairs, clear codes and perform multiple open/close cycles with scan tool, then road-test to confirm operation and ensure code does not return.
Likely causes
- Actuator seized from corrosion/debris or internal gear failure
- Failed position feedback sensor inside the actuator
- Loss of power or ground to actuator (fuse, connector, wiring chafe)
- Connector corrosion or bent pins at actuator or BCM
- Control module output transistor failed
Fault status
Status
Active Air Dam Stuck — control module detects the air dam did not achieve the commanded position or is not moving. Check for mechanical interference, actuator failure, supply/ground faults, wiring/connectors, and module communications.
Repair difficulty: Medium
Diagnostic time: 0.5-2 hours
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Code
C0630
HUMMER
C — Chassis
Right Rear Position Sensor Malfunction
AI status
Completed
Completed
100%
Causes
- Mechanical obstruction or binding of the air dam linkage
- Failed actuator motor or internal gearbox
- Damaged or worn position sensor (potentiometer or hall sensor) inside actuator
- Open or shorted wiring, corroded or disconnected connector
- Blown fuse or relay in the air dam power circuit
- Faulty body control module (BCM) or actuator driver circuit
Symptoms
- Air dam remains in one position (stuck open or stuck closed)
- Warning light or message related to air dam/aerodynamics
- Reduced fuel economy or wind noise when air dam is stuck open
- Intermittent operation or slow movement of the air dam
- DTC stored and fault indicator may return after clear
What to check
- Read and record all related DTCs and freeze-frame data with a scan tool
- Visually inspect the air dam, linkage and mounting for binding, damage or foreign objects
- Verify fuse(s) and relay(s) for the air dam circuit are intact
- Inspect connectors for corrosion, water intrusion, and bent pins at actuator and control module
- Check supply voltage and ground at the actuator connector with key ON and during operation
- Perform resistance and continuity checks on actuator wiring to the module
Signal parameters
- Actuator supply voltage: nominal battery voltage (~12 V) with key ON and during commanded movement
- Actuator ground continuity and low resistance to chassis ground
- Position feedback voltage: typical 0–5 V (varies with position) or specified sensor signal
- Motor current draw: normal running current vs stalled (amps)
- Resistance of position sensor and motor windings (ohms)
- CAN/ LIN messages: actuator command and status frames (if networked)
Diagnostic algorithm
- Retrieve and document DTC(s) and freeze-frame with a diagnostic scan tool. Note conditions (temp, key state, speed).
- Attempt a simple actuator cycle using the scan tool while observing and listening. If it moves intermittently, note behavior.
- Visually inspect the air dam assembly for physical obstruction, damage, or foreign material preventing motion. Manually check if it can be moved by hand (vehicle secure, ignition OFF).
- Check fuses and relays for the air dam circuit; replace if blown and re-test.
- With ignition ON, measure supply voltage and ground at the actuator connector. If no supply or ground, trace back to fuse, relay, or BCM.
- Backprobe the position feedback pin while commanding the actuator. Verify feedback changes smoothly across full travel. Erratic or no change suggests sensor or wiring fault.
- Measure motor current while commanding movement. A very high/stalled current indicates mechanical binding or seized motor; near-zero current with proper command suggests open circuit or driver fault.
- Inspect wiring harness for chafe, breaks, or corrosion and perform continuity checks to the module. Repair any damaged wiring/connectors.
- If wiring and power are good but actuator doesn’t respond or feedback is invalid, remove and bench-test the actuator (follow vehicle-specific service manual). Replace actuator if internal failure is confirmed.
- If actuator and wiring appear good, check BCM/module outputs and communication. Test or replace module only after confirming external components and wiring.
- After repairs, clear codes and perform multiple open/close cycles with scan tool, then road-test to confirm operation and ensure code does not return.
Likely causes
- Actuator seized from corrosion/debris or internal gear failure
- Failed position feedback sensor inside the actuator
- Loss of power or ground to actuator (fuse, connector, wiring chafe)
- Connector corrosion or bent pins at actuator or BCM
- Control module output transistor failed
Fault status
Status
Active Air Dam Stuck — control module detects the air dam did not achieve the commanded position or is not moving. Check for mechanical interference, actuator failure, supply/ground faults, wiring/connectors, and module communications.
Repair difficulty: Medium
Diagnostic time: 0.5-2 hours
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