This bulletin applies to 2009-2011 Jeep Liberty vehicles equipped with a 3.7L engine and automatic transmission, built before Feb. 23, 2011. The MIL may be on, with DTC P0401 (EGR system performance) stored in the PCM. No other symptoms will be noted or experienced.
The fix involves selectively erasing and reprogramming the PCM with new software. The software release must be 12.01 or higher.
Using scan tool (wiTECH) with the appropriate diagnostic procedures available in TechCONNECT, verify that all engine systems are functioning as designed. If DTCs other than the one listed here are stored, record and repair as necessary before proceeding.
1. Reprogram the PCM with the latest software. After PC reprogramming, clear any DTCs that may have stored in other modules.
2. Type the necessary information on an authorized modification label (P/N 04275086AB) and attach it near the VECI label.