Code
C1726
HUMMER
C — Chassis
Right Rear Damper Actuator Short Circuit to Ground
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UK: 17
EN: 20
RU: 14
AI status
Completed
Completed
100%
Causes
- Damper actuator internal short to ground
- Damper actuator connector damaged, corroded, or wet
- Wiring harness shorted to chassis ground (pin chafing, broken insulation)
- Incorrect or loose ground at module or actuator
- Faulty suspension control module or driver transistor
- Aftermarket equipment or previous repair damaged circuit
Symptoms
- Warning lamp or suspension message on dash (Service Suspension / Reduced Ride Control)
- Right rear wheel ride height or damping not adjustable / harsh or soft ride on that corner
- Fault memory stored with C1726 and possibly related suspension codes
- Uneven vehicle stance or stability control interventions during cornering
What to check
- Scan for stored/active codes and freeze frame data; note any other suspension or communication codes
- Visually inspect the right rear damper actuator connector and wiring for corrosion, damage, or water entry
- With ignition on, back-probe the actuator connector and measure voltages on control and power pins
- Check continuity and resistance between the actuator control pin and chassis ground with the connector disconnected
- Inspect vehicle grounds and module connectors for tightness and corrosion
- Perform a wiggle test on wiring while monitoring live data/voltage to see intermittent faults
Signal parameters
- Control signal: typically PWM or variable 0–12 V command from suspension control module (consult factory manual for exact waveform)
- Resistance (actuator): low-ohm resistance expected across actuator motor/driver (typical tens to low hundreds of ohms depending on design) — high or infinite indicates open, near zero indicates short
- Voltage to actuator power supply: battery voltage (approx. 12 V with ignition on) on the power pin
- Short-to-ground indication: control pin reading ~0 V or near chassis ground when command is present
- Module fault registers: driver short-to-ground flag set in suspension control module
Diagnostic algorithm
- Read and record all codes and live data from the suspension and body modules using a capable scan tool. Note whether code is active or intermittent.
- Visually inspect the right rear damper actuator connector, wiring harness, and nearby chassis for physical damage, corrosion, or pin damage. Repair obvious damage.
- With ignition ON (engine OFF) and connector plugged in, back-probe the connector and measure voltage on the power and control pins while commanding the damper if the tool supports it. Verify expected command voltage/waveform.
- Turn ignition OFF, disconnect the actuator connector and measure resistance between the control pin and chassis ground. A very low resistance (near 0 Ω) indicates an electrical short to ground.
- If short present with connector disconnected, isolate wiring by disconnecting intermediate connectors and measuring segments until the short location is found. Repair/replace damaged wiring or connectors.
- If wiring checks good, bench-test or replace the damper actuator (or swap with known-good if available) and recheck resistance and operation.
- If actuator and wiring are good, test the suspension control module outputs for shorted driver (may require oscilloscope or module bench test). Replace module only after confirming other components are good.
- After repairs, clear codes, perform suspension auto-level/learn procedure if required, and road test to verify fault does not return.
Likely causes
- Corroded or water-intruded connector at right rear damper
- Chafed wire contacting body/frame near rear suspension
- Failed damper actuator electronics (common failure point)
- Poor ground at actuator or control module
- Short in pigtail from previous repair
Fault status
Status
Right Rear Damper Actuator Short Circuit to Ground — suspension control module detected a short on the right rear damper command/feedback circuit. Repair wiring, connector, actuator, or module as required.
Repair difficulty: Medium
Diagnostic time: 0.5-2.5 hours
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