Scan Tool Needed to Check Jeep Issues
This bulletin applies to 2012-2014 Jeep Compass and Patriot vehicles. Customers may experience a MIL on. Technicians may find DTCs P0335 (crankshaft position sensor circuit), U0140 (lost communication with body control module), and/or P219A (air-fuel ratio cylinder imbalance Bank 1). The engine may be hard to start at temperatures of -20 degrees F for vehicles using E85 fuel. In addition, customers may report that the vehicle has failed emissions certification tests. Upon further investigation, it may be found that the individual cylinder fuel control (ICFC) monitors are reporting as failing on the scan tool even though the monitors have actually passed.
Using a scan tool, verify that all systems are functioning as designed. If DTCs other than those listed are present, record and repair as needed before proceeding.
Reprogram the PCM with the latest available software.
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
Motor Age Editor
Mike Mavrigian has written thousands of automotive technical magazine articles involving a variety of specialties, 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.