Code I039 (4.9L) SSS Signal Fault

This code will normally set during Speed Sensitive Suspension (SSS) diagnostics. If SSS diagnostics were recently performed, clear codes first, test drive vehicle and recheck trouble codes. When this code failure is present, DIC will display SERVICE RIDE CONTROL warning.
This code will set if voltage of Red wire between IPC and SSS control module goes low when vehicle is greater than 15 MPH or if voltage is high when vehicle speed is less than 5 MPH. Possible causes of this code are:
- SSS fault detected by SSS control module.
- SSS diagnostic mode entered.
- Loss of IPC vehicle speed information.
- Open or short in Red, Brown or Dark Green/White wire circuit.
- Faulty SSS control module.
Enter diagnostics. See ENTERING SELF-DIAGNOSTICS . If Code E024 is also set, a vehicle speed sensor may be at fault. See appropriate G - TEST W/CODES article in ENGINE PERFORMANCE. If Code E024 is not set and speedometer does not function, see SPEEDOMETER INOPERATIVE/INACCURATE under IPC TESTS under COMPONENT TESTING.
If Code P024 is not set and speedometer functions properly, repair Speed Sensitive Suspension (SSS) system. See appropriate ELECTRONIC SUSPENSION article in SUSPENSION. After all repairs are completed, clear all codes and verify correct operation.