Service suspension and 4WD

[PERRYF]

I have a '07 Suburban LTZ with 114k miles. The service suspension, service 4WD is popping ip in the DIC. I also get P0455 error code when I scan it.

When I try to use 4WD, the indicator light just blinks. 4LO works fien, but it won't engage in 4HI or Auto.

I have no clue why the service suspension or P0455 are on.

 

Any help is appreciated. 5 kids and broke

[sahls01gmc]

First thing I would do is get the TCCM scanned. There is a code stored on there somewhere that should shed some light on what is going on. I'd leave it in 2WD for now until you figure out what it is. Could be the dash switch, could be an actuator or could even be something internal. Either way, getting it scanned will help diagnose it better.

 

Post your results

[gmtech4]

suspension system has a code to be pulled and diagnosed ,,,,it is computer controlled ( like EVERYTHING else on the truck )