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DTC C1721: Left Rear Damper Solenoid (Short To Ground)

  1. Perform RTD diagnostic system check. See RTD DIAGNOSTIC SYSTEM CHECK . After performing RTD diagnostic system check, go to next step.
  2. Using scan tool, retrieve DTCs. If DTC C1786, C1787 or C1788 is set, go to appropriate DTC for diagnosis. See DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION  table under SELF-DIAGNOSTICS. If DTC C1786, C1787 or C1788 is not set, go to next step.
  3. Turn ignition off. Disconnect left rear damper solenoid connector. Measure resistance between solenoid connector terminals (solenoid side). If resistance is 9.5-15.5 ohms, go to next step. If resistance is not 9.5-15.5 ohms, replace damper (shock absorber). See SHOCK ABSORBER  under REMOVAL & INSTALLATION. After repairs, go to step 8).
  4. Check for continuity between ground and left rear damper solenoid connector Dark Blue/White wire (solenoid side). If continuity exists, replace damper (shock absorber). See SHOCK ABSORBER  under REMOVAL & INSTALLATION. After repairs, go to step 8). If continuity does not exist, go to next step.
  5. Reconnect left rear damper solenoid connector. Disconnect RTD module connector C2. Check for continuity between ground and harness side of RTD module connector C2, terminal C3 (Dark Green wire). If continuity exists, locate and repair short to ground in Dark Green or Dark Blue/White wire between RTD module and damper solenoid and go to step 8). If continuity does not exist, go to next step.
  6. Check left rear damper circuit for intermittent malfunction. Using scan tool, cycle left rear damper solenoid while moving wiring and connectors. If intermittent malfunction is found and repaired, go to step 8). If intermittent malfunction is not found and repaired, go to next step.
  7. Turn ignition off. Connect or install any connector or components that were disconnected or removed. Turn ignition on. Using scan tool, clear all DTCs. Cycle left rear damper solenoid for 60 seconds. If DTC C1721 is set, replace RTD control module. See RTD CONTROL MODULE  under REMOVAL & INSTALLATION. After repairs, go to next step. If DTC C1721 is not set, system is functioning properly.
  8. Turn ignition off. Connect or install any connector or components that were disconnected or removed. Turn ignition on. Using scan tool, clear all DTCs. After repairs, perform RTD diagnostic system check.
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