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DTC C1743: Loss Of Vehicle Speed Signal

The ESC module receives a VSS signal from serial data line as well as PCM. This code may set when the VSS signal on the serial data line is greater than 20 MPH, and the VSS signal from the PCM is less than 3 MPH. ESC module will then set DTC C1743 and ignore information about vehicle speed from PCM. This code may be set if PCM loses VSS signal intermittently.

  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. If any Powertrain Control Module (PCM) Vehicle Speed Sensor (VSS) DTCs are set, diagnose Powertrain Control Module (PCM) DTCs. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. If no PCM vehicle speed sensor DTCs are set, go to next step.
  3. Test drive vehicle and observe speedometer operation. If speedometer operates properly, go to step  5 . If speedometer does not operate properly, go to next step.
  4. Turn ignition off. Disconnect RTD control module connector C2. Test drive vehicle and observe speedometer operation. If speedometer operates properly, go to step  8 . If speedometer does not operate properly, diagnose vehicle speed sensor. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
  5. Check for an open in Dark Green/White wire between RTD control module connector C2, terminal C6 and PCM. Repair as necessary and go to step  8 . See WIRING DIAGRAMS  . If Dark Green/White wire is okay, go to next step.
  6. Check RTD control module connector C2 for intermittent open. Check for intermittent open in vehicle speed circuit (Dark Green/White wire). If connector and circuit are faulty, repair as necessary and go to step  8 . If connector and circuit are okay, go to next step.
  7. Turn ignition off. Reinstall/reconnect all components/connectors. Using scan tool, clear all DTCs. Drive vehicle faster than 20 MPH for 20 seconds. If DTC C1743 is set, replace RTD control module. See RTD CONTROL MODULE  under REMOVAL & INSTALLATION. After repairs, go to next step. If DTC C1743 is not set, system is functioning properly.
  8. Turn ignition off. Reinstall/reconnect all components/connectors. Using scan tool, clear all DTCs
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