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DTC C1650: RTD Module Malfunction

When ign switch is turned on, ESC module performs internal self diagnostic check. If any internal (inside ESC controller) faults are discovered it sets a DTC C1650. Depending on nature of fault detected, ESC module may command 0% PWM duty cycle, disabling all 4 shock absorbers, or ESC module may simply ignore steering position input and control shock absorbers based solely upon vehicle speed input. During either of these actions, ESC module sends a message to IPC (instrument panel control) to display SERVICE RIDE CONTROL and/or SHOCKS INOPERATIVE message. If the 0% PWM duty cycle action was taken, ESC module sends a message to PCM (Powertrain Control Module) to limit vehicle speed to 80 MPH.

  1. Perform RTD diagnostic system check. See RTD DIAGNOSTIC SYSTEM CHECK  under DIAGNOSIS & TESTING. After performing RTD diagnostic system check, go to next step.
  2. Using scan tool or IPC, clear all DTCs. Cycle ignition off, then on. Using scan tool, check for DTCs. If DTC C1650 is set, go to next step. If DTC C1650 is not set, system is functioning properly.
  3. Replace RTD control module. See RTD CONTROL MODULE  under REMOVAL & INSTALLATION. After repairs, go to next step.
  4. Turn ignition off. Connect or install any connector or components that were disconnected or removed. Turn ignition on. Using scan tool, clear all DTCs.
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