"Flash: powertrain diagnostic and system improvements this bulletin involves selectively erasing and...

Bulletin number

18-050-16 REV. A

Component

Electrical system: software

Summary

"flash: powertrain diagnostic and system improvements this bulletin involves selectively erasing and reprogramming the powertrain control module (PCM) with new software. Symptom/condition: a small number of customers may experience a malfunction indicator lamp (mil) illumination. Upon further investigation the technician may find one or more of the following diagnostic trouble codes (dtcs) set in the PCM: jc vehicles 3.6l: · p0335 - crankshaft position sensor circuit. · p2610 - PCM internal engine off timer performance. · u0140 - lost communication with body control module (bcm). · p0456 - evap system small leak. · p0108 - manifold absolute pressure sensor circuit high (2012 my only). The following transmission enhancements are also included in this software update: · continuous cycling of fuel pump relay when using remote start. · 1 - 2 upshift clunk or bump. · 3 - 4 harsh upshift at closed throttle after a wot stab in 1st or 2nd gear. · 4 - 5 upshift clunk or bump. · 5 - 6 upshift clunk or bump. · 5- 4 downshift clunk or bump. · 6 - 5 downshift clunk or bump. · RPM fluctuating or jerking while operating in cruise control. Condition is more noticeable when the vehicle is going up and down grades. · improves the consistency of how shifts are controlled during upshifts “torque management”. · delayed downshifts. Jc vehicles 2.4l: · u0140 - lost communication with body control module (bcm). · p0456 - evap system small leak. The following transmission enhancements are also included in this software update: · 1 - 2 upshift clunk or bump. · 3 - 4 harsh upshift at closed throttle after a wot stab in 1st or 2nd gear. · 4 - 5 upshift clunk or bump. · RPM fluctuating or jerking while operating in cruise control. Condition is more noticeable when the vehicle is going up and down grades. · 1 - 2 harsh upshift going down a grade. · 3 - 2 downshift clunk or bump. · 4 - 3 downshift clunk or bump.

Owners of these vehicles have filed 699 complaints in the electrical category.