Code
C1725
HUMMER
C — Chassis
Right Rear Damper Actuator Short Circuit to Battery
Views:
UK: 7
EN: 13
RU: 10
AI status
Completed
Completed
100%
Causes
- Damper/actuator internal short or internal connector failure
- Damaged wiring harness (chafing, pinched, melted) causing power feed to control circuit
- Corroded or pushed-pin connector creating unintended battery feed
- Shorted splice or accessory fused feed tied into actuator circuit
- Faulty suspension control module (rare) or module driver stage damaged
- Faulty or incorrect replacement actuator installed
Symptoms
- Suspension warning lamp or service message for suspension/damper system
- Right rear damper stuck in a fixed position (firm/extended/compressed) or reduced damping control
- Vehicle ride height or handling noticeably uneven on right rear corner
- Diagnostic trouble codes present and possibly limp/limited suspension operation
- Blown fuse(s) related to suspension circuit (occasionally)
What to check
- Read stored codes and freeze-frame data with a scan tool; note any related chassis codes
- Visual inspection of right rear damper connector and harness for damage, corrosion, heat or pinch points
- Inspect nearby harness routing points, clips, frame mounts and suspension moving joints for chafe
- Check related fuses and relays for the suspension/damper circuit
- Backprobe the right rear damper connector and measure voltage at key pins with ignition ON and OFF
- Disconnect the actuator and verify whether the short/voltage disappears (re-scan codes)
Signal parameters
- Supply voltage (battery): approximately 12 V (varies with ignition/battery state)
- Control signal type: may be switched 12 V or PWM command from suspension control module (refer to service manual)
- Expected at disconnected actuator control pin: no battery feed (0 V) on command/signal line when not commanded
- Typical actuator coil/electronic module resistance: consult vehicle service data (commonly low ohm range); a near-zero resistance reading to battery indicates a short
- If available, monitor control module output for PWM frequency and duty cycle with a scope while system active
Diagnostic algorithm
- Verify the code: connect a scan tool, record all stored/active codes and freeze frame data; note whether other damper circuits are affected.
- Reproduce: clear codes, cycle ignition and operate suspension modes to see if code returns. Intermittent codes may indicate harness movement.
- Visual inspection: examine right rear damper connector, harness, and routing for chafe, heat damage, crushed wires, or corrosion. Pay attention to areas near control arms and frame mounting points.
- Check power/fuse: verify fuses/relays for the damper system. Replace blown fuses only after diagnosing cause of short.
- Voltage check at connector: backprobe the damper connector with actuator connected and disconnected. With ignition ON, check for battery voltage on pins that should be low or signal-only. Presence of constant battery voltage on a control/signal pin suggests short to battery.
- Continuity/isolation tests: with battery disconnected, check continuity between the suspected control pin and battery positive. A direct short (very low resistance) indicates wiring or actuator short to battery.
- Wiggle test: with connector connected, have an assistant move suspension and harness to try to reproduce the fault while monitoring voltage and codes.
- Swap or isolate actuator: if available, swap with a known-good identical actuator (or disconnect actuator) to confirm whether the actuator is the fault. If code clears with actuator disconnected, suspect actuator internal short.
- Inspect/repair wiring: repair damaged wiring, replace corroded connectors, and secure harness routing. Use service routing diagrams and protect repaired sections with loom and grommets.
- Control module check: if wiring and actuator test good, test the suspension control module output drivers for shorts or replace the module per service procedure.
- Final: after repairs, clear codes, perform suspension self-test/calibration as required, and road test to confirm repair. Re-scan to ensure code does not return.
Likely causes
- Open or damaged insulation on the right rear damper harness allowing contact with battery power
- Failed right rear damper actuator where internal electronics have shorted to the power rail
- Connector contamination or bent pins forcing a battery feed onto the signal/control pin
- Aftermarket wiring or previous repair created an improper power connection
Fault status
Status
Right Rear Damper Actuator: Short Circuit to Battery detected on actuator control/power circuit. The suspension control module has detected battery voltage where it should be a control/signal level. System may disable that damper or enter reduced operation.
Repair difficulty: Medium
Diagnostic time: 1.5 - 3.5 hours
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Code
C1725
Other
C — Chassis
Air Suspension Front Pneumatic Failure
Views:
UK: 14
EN: 24
RU: 22
AI status
Completed
Completed
100%
Causes
- Damper/actuator internal short or internal connector failure
- Damaged wiring harness (chafing, pinched, melted) causing power feed to control circuit
- Corroded or pushed-pin connector creating unintended battery feed
- Shorted splice or accessory fused feed tied into actuator circuit
- Faulty suspension control module (rare) or module driver stage damaged
- Faulty or incorrect replacement actuator installed
Symptoms
- Suspension warning lamp or service message for suspension/damper system
- Right rear damper stuck in a fixed position (firm/extended/compressed) or reduced damping control
- Vehicle ride height or handling noticeably uneven on right rear corner
- Diagnostic trouble codes present and possibly limp/limited suspension operation
- Blown fuse(s) related to suspension circuit (occasionally)
What to check
- Read stored codes and freeze-frame data with a scan tool; note any related chassis codes
- Visual inspection of right rear damper connector and harness for damage, corrosion, heat or pinch points
- Inspect nearby harness routing points, clips, frame mounts and suspension moving joints for chafe
- Check related fuses and relays for the suspension/damper circuit
- Backprobe the right rear damper connector and measure voltage at key pins with ignition ON and OFF
- Disconnect the actuator and verify whether the short/voltage disappears (re-scan codes)
Signal parameters
- Supply voltage (battery): approximately 12 V (varies with ignition/battery state)
- Control signal type: may be switched 12 V or PWM command from suspension control module (refer to service manual)
- Expected at disconnected actuator control pin: no battery feed (0 V) on command/signal line when not commanded
- Typical actuator coil/electronic module resistance: consult vehicle service data (commonly low ohm range); a near-zero resistance reading to battery indicates a short
- If available, monitor control module output for PWM frequency and duty cycle with a scope while system active
Diagnostic algorithm
- Verify the code: connect a scan tool, record all stored/active codes and freeze frame data; note whether other damper circuits are affected.
- Reproduce: clear codes, cycle ignition and operate suspension modes to see if code returns. Intermittent codes may indicate harness movement.
- Visual inspection: examine right rear damper connector, harness, and routing for chafe, heat damage, crushed wires, or corrosion. Pay attention to areas near control arms and frame mounting points.
- Check power/fuse: verify fuses/relays for the damper system. Replace blown fuses only after diagnosing cause of short.
- Voltage check at connector: backprobe the damper connector with actuator connected and disconnected. With ignition ON, check for battery voltage on pins that should be low or signal-only. Presence of constant battery voltage on a control/signal pin suggests short to battery.
- Continuity/isolation tests: with battery disconnected, check continuity between the suspected control pin and battery positive. A direct short (very low resistance) indicates wiring or actuator short to battery.
- Wiggle test: with connector connected, have an assistant move suspension and harness to try to reproduce the fault while monitoring voltage and codes.
- Swap or isolate actuator: if available, swap with a known-good identical actuator (or disconnect actuator) to confirm whether the actuator is the fault. If code clears with actuator disconnected, suspect actuator internal short.
- Inspect/repair wiring: repair damaged wiring, replace corroded connectors, and secure harness routing. Use service routing diagrams and protect repaired sections with loom and grommets.
- Control module check: if wiring and actuator test good, test the suspension control module output drivers for shorts or replace the module per service procedure.
- Final: after repairs, clear codes, perform suspension self-test/calibration as required, and road test to confirm repair. Re-scan to ensure code does not return.
Likely causes
- Open or damaged insulation on the right rear damper harness allowing contact with battery power
- Failed right rear damper actuator where internal electronics have shorted to the power rail
- Connector contamination or bent pins forcing a battery feed onto the signal/control pin
- Aftermarket wiring or previous repair created an improper power connection
Fault status
Status
Right Rear Damper Actuator: Short Circuit to Battery detected on actuator control/power circuit. The suspension control module has detected battery voltage where it should be a control/signal level. System may disable that damper or enter reduced operation.
Repair difficulty: Medium
Diagnostic time: 1.5 - 3.5 hours
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