This bulletin applies to 2014-2015 RAM 2500/3500 vehicles built on or before May 23, 2015, equipped with Auto Level Rear Air Suspension. The MIL may be on, and DTC C1556-14 (ride height air pressure sensor – circuit short to ground or open) may be stored, and the rear air suspension system is inoperative.
If DTC C1556-14 is found setting active or stored in the PCM memory, inspect the wiring harness for shorts or grounding. Repair as necessary. If no wiring issues are found, replace the air compressor. The compressor is available as P/N 68239571AA. Nitrogen is P/N NPN.
About the Author
Information courtesy of Mitchell 1
Information for Technical Service Bulletins comes from ProDemand, Mitchell 1's auto repair information software for domestic and import vehicles. Headquartered in San Diego, Mitchell 1 has provided quality repair information solutions to the automotive industry since 1918.
Mike Mavrigian has written thousands of automotive technical magazine articles involving a variety ofspecialties, from engine building to wheel alignment, and has authored more than a dozen books that crisscross the automotive spectrum. Mike operates Birchwood Automotive, an Ohio shop that builds custom engines and performs vintage vehicle restorations. The shop also features a professional photo studio to document projects and to create images for articles and books.
