2009 Jeep Patriot P0842, P0700, P2017 and P0456 Fault Codes - Acceleration Issues at 30 mph
My 2009 Jeep Patriot has been driving fine to campus, but on the way home it started struggling to accelerate—only reaching about 30 mph unless going downhill. My dad checked the vehicle and found several diagnostic trouble codes: P0456, P0700, P2017, P084
This is not a DIY repair issue—especially concerning the transmission-related codes like P0700, P0842, and P0847. The U1146 code indicates a communication problem between the vehicle's control modules. The 2009 Jeep Patriot uses a 2.4-liter engine with a 6R140 transmission (often referred to as a CVT), which is known for complex electronic communication issues. If the vehicle is out of warranty, there may be specific dealership policies or limited coverage available. P0456 typically points to a small evaporative emissions leak, while P2017 suggests a manifold tuning valve that may be stuck and requires cleaning. These are common but not always easy to resolve without proper diagnostic tools. For these issues, especially with the transmission codes, it's strongly recommended to consult a certified dealer or specialized technician familiar with 6R140 CVT systems.