DTC C1768: Position Sensor Supply Malfunction (OVERCURRENT)

The ESC provides a common 8-volt regulated power supply to all suspension position sensors. If ESC module detects sensor supply voltage lower than 6 volts or higher than 9 volts for at least 1 second in 4 consecutive ignition cycles, DTC C1768 will be set. The ESC will then provide shock absorber control based on vehicle speed only, and it will send a message to IPC to display SERVICE RIDE CONTROL message.

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. Disconnect all 4 position sensor connectors. Using scan tool, clear all DTCs. If DTC C1768 is set as current, go to next step. If DTC C1768 is not set as current, go to step  6 .
3. Reconnect all 4 position sensor connectors. Using scan tool, monitor each position sensor voltage. If any position sensor voltage is less than one volt, go to next step. If all position sensor voltages are more than one volt, go to step  5 .
4. Check circuits No. 1208 (Red/Black wire), No. 1205 (Purple/White wire), No. 1211 (Purple/White wire) and No. 1214 (Purple/White wire) for short to ground and repair as necessary. See WIRING DIAGRAMS  . When repairs are complete, go to step  10 . If circuits (wires) are okay, go to step  9 .
5. Check circuits No. 1208 (Red/Black wire), No. 1205 (Purple/White wire), No. 1211 (Purple/White wire) and No. 1214 (Purple/White wire) for short to voltage and repair as necessary. See WIRING DIAGRAMS  . When repairs are complete, go to step  10 . If circuits (wires) are okay, go to step  9 .
6. Using scan tool, clear all DTCs. Reconnect all 4 position sensors one at a time checking for DTC after each connector is reconnected. If DTC C1768 sets after reconnecting any position sensor, go to step  8 . If DTC C1768 does not set, go to next step.
7. Check circuits No. 1208, No. 1214 (both Red/Black wires), and No. 1205 and No. 1211 (both Purple/White wires) for intermittent operation. See WIRING DIAGRAMS  . See NOTES ON INTERMITTENTS  under DIAGNOSIS & TESTING. After repairs, go to step  10 . If no problem was found, system is functioning properly.
8. Replace position sensor that caused DTC to set when reconnected. See RTD POSITION SENSOR  under REMOVAL & INSTALLATION. After repairs, go to step  10 .
9. Replace RTD control module. See RTD CONTROL MODULE  under REMOVAL & INSTALLATION. After repairs, go to next step.
10. Turn ignition off. Reinstall/reconnect all components/connectors. Using scan tool, clear all DTCs and perform RTD DIAGNOSTIC SYSTEM CHECK  under DIAGNOSIS & TESTING.