Code
C1722
HUMMER
C — Chassis
Left Rear Damper Actuator Open Circuit
Views:
UK: 10
EN: 12
RU: 9
AI status
Completed
Completed
100%
Causes
- Open or broken wiring in left rear damper actuator circuit
- Corroded, loose or damaged connector at the actuator
- Failed left rear damper actuator (internal open)
- Faulty suspension control module (SCM) or module ground
- Blown fuse or failed power/ground for the actuator circuit
- Water intrusion or physical damage to harness near the damper
Symptoms
- Suspension warning lamp or message displayed
- Reduced or disabled active damping for left rear wheel; harsh or uncontrolled ride at that corner
- Uneven ride height or vehicle instability during cornering (depending on system behavior)
- Stored C1722 fault and possibly related suspension codes
- No actuator response when suspension is commanded to change damping
What to check
- Read all stored codes and freeze frame data with a capable scan tool; note related suspension or power distribution codes
- Visual inspection of left rear damper, connector, harness, and chassis grounds for corrosion, damage or water intrusion
- Check relevant fuses and relays for the suspension system power feed
- With ignition ON, verify battery voltage present at the actuator power pin and good ground at actuator connector
- Check for corrosion, bent pins, or poor mating at actuator connector
- Perform a wiggle test on the wiring while monitoring the circuit for changes or intermittent faults
Signal parameters
- Power: ~12 V (battery voltage) present at actuator power pin with ignition ON (verify per vehicle service manual)
- Ground: solid chassis ground continuity to actuator ground pin
- Control/feedback: actuator should show expected resistance/continuity to module (consult service manual for specific ohm values)
- Communications: suspension control module may use CAN messages to command the actuator — scan tool should show command and status for left rear actuator
- When commanded by a diagnostic tool, expect a change in measured voltage or PWM on the control line if actuator is powered (refer to service literature)
Diagnostic algorithm
- Connect an OEM-capable scan tool, record all codes, and attempt an actuator bidirectional test if available.
- Visually inspect left rear actuator, connector, and harness for damage, corrosion, or water entry. Repair or clean as needed.
- Check fuses/relays related to suspension power distribution; replace if open.
- With connector disconnected, measure resistance between actuator power and ground pins and to chassis ground. Compare to service manual; an open (infinite) reading indicates internal actuator open.
- With connector connected and ignition ON, backprobe power and ground pins at the actuator connector to confirm battery voltage and ground continuity. If power/ground OK, command the actuator with a scan tool and observe control signal (voltage/PWM) while monitoring for response.
- If power/ground are not present at the connector, trace wiring back to the suspension control module and check for open circuits, pin damage, or poor grounds. Repair wiring as needed.
- If power/ground present but actuator shows open or no response, swap with a known good actuator (or bench-test actuator per service procedures) to verify actuator failure before replacement.
- Inspect and test the suspension control module outputs and grounds if wiring and actuator are good; update module software if TSBs recommend.
- After repair or replacement, clear codes, perform calibration or relearn procedures if required, and road-test to confirm fault does not return.
Likely causes
- Open/broken harness between left rear actuator and suspension control module
- Corroded/loose connector at left rear actuator
- Failed left rear damper actuator (internal open)
- Blown fuse or loss of actuator power or ground
Fault status
Status
Left Rear Damper Actuator Open Circuit — check actuator, connector, wiring and suspension control module.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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