This bulletin applies to 2009-2010 Jeep Commander and Grand Cherokee models equipped with a 3.7L engine and NAG1 automatic transmission. The MIL may be on, with DTC P013A and/or P013C stored.
P013A………….O2 sensor ½ slow response – rich to lean
P013C………….O2 sensor 2/2 slow response – rich to lean
Updating the PCM software will correct this condition.
Using a scan tool (wiTECH) with the appropriate diagnostic procedures available in TechCONNECT, verify that all engine and transmission systems are functioning as designed. If DTCs other than the ones listed here are present, record and repair before proceeding.
1. Reprogram the PCM with 10.03 or later software. Follow the detailed procedures available in DealerCONNECT/TechCONNECT. Refer to Group 8 – Electrical > Electonic Control Modules – Service Information > Module – Powertrain Control > Standard Procedures > PCM/ECM Programming – Gas.
2. Clear any DTCs that may have set in other modules as a result of programming. Type the necessary information on an Authorized Modification label and attach it near the VECI label.