Dean H

Post the codes.

2016 DJ, Code definition 2.4L engine. P0302-CYLINDER 2 MISFIRE When Monitored and Set Conditions. When Monitored: This diagnostic runs continuously when the following conditions are met: • The engine is running. • The adaptive numerator has been successfully updated. Set Conditions: • The Powertrain Control Module (PCM) detects that the variation in crankshaft speed between each cylinder exceeds a calibrated value, based on engine rpm and load. The Powertrain Control Module (PCM) detects that the variation in crankshaft speed between each cylinder exceeds a calibrated value, based on engine rpm and load Default Actions: • The MIL light will illuminate. POSSIBLE CAUSES FUEL DELIVERY SYSTEM IGNITION COIL, WIRING, OR CONNECTORS ECT SENSOR, WIRING, OR CONNECTORS MAP SENSOR, WIRING, OR CONNECTORS 02 SENSOR, WIRING, OR CONNECTORS ENGINE MECHANICAL SYSTEM POWERTRAIN CONTROL MODULE (PCM) 2. DIAGNOSTIC INSPECTION NOTE: Anything that affects the speed of the crankshaft can cause this DTC to set. NOTE: When a misfire is detected, the PCM will shut down the injector control circuit for the misfiring cylinder. NOTE: Misfire may occur and may not be caused by component failure. Any of the following conditions can cause a misfire: Worn serpentine belt. Misalignment or binding water pump, P/S pump or A/C compressor pulleys. Improper CKP, CMP, MAP, or TPS Sensor mounting. Poor connector/terminal to component connection for CKP sensor, CMP sensor, MAP sensor, TPS sensor, fuel injector, ignition coil, etc. Corroded PCM power or ground circuits. Vacuum leaks. Restriction in the air induction or exhaust system. Internal engine component malfunction. Moisture on ignition system components. Insufficient fuel. Low quality fuel. Manual transmission bog. Towing overload.

Welcome aboard. Please read this- https://www.dodgejourneyforum.com/topic/18760-journey-maintenance-and-other-fun-facts/

2016, 3.6L 135k When, I got my DJ. I knew it would have electrical issues. Because of the 4 gauge battery and electrical cables. The only other engine to chassis ground. Being the very small gauge wire on the passenger mount. With all it's electronic modules (12-14) it needs plenty of good grounds. Bad grounds cause all kinds of strange problems. I went with more grounds the merrier for my DJ. At a minimum if people would add a 2 gauge cable. Negative battery stud on strut tower to engine block stud. 4 gauge cable from the engine passenger mount to the strut tower studs. They would be good to go . Cost wise pretty cheap to do, for the added reliability. So, I posted these threads- https://www.dodgejourneyforum.com/topic/18210-electrical-system-fyi-battery/ https://www.dodgejourneyforum.com/topic/18374-electrical-system-fyi-ground-system/ https://www.dodgejourneyforum.com/topic/18296-charging-system-101-with-diagrams/ I believe in building a good solid electrical foundation. Easiest upgrade to do yourself. Which, would eliminate some problems. Then narrow it down to troubleshooting the specific load ( module, light etc.) Connections and the very small wires throughout the vehicle . It's too easy to get focused on a part, and miss it being something simple. Causing the actual problem. Well, to be honest cut down on repeat forum posts! Dean

Yes. Now is the perfect time to do it. The Dodge spec of 120k miles is just crazy. 60k miles is a safe bet. Too keep it running right and last as long as possible. People let it go too many miles or do not service it at all. It starts to to get expensive after that. Even, if there is any kind of warranty on it. Get it serviced.

I found this on YouTube. Eric O., South Main Auto. Heater core flush using CLR on a Journey. https://youtu.be/LtnVyFNyU1w?si=uXpf8K_FffQeEqJ3

Hi 5R9, Would you post a picture of your spliced connections on the heater core tubes?

Read my posts regarding the battery and the electrical system on the Journey. Things, that you should know and address before any electrical issues start. https://www.dodgejourneyforum.com/topic/18210-electrical-system-fyi-battery/ https://www.dodgejourneyforum.com/topic/18374-electrical-system-fyi-ground-system/ Correct Transmission service High priority https://www.dodgejourneyforum.com/topic/18151-automatic-transmission-fyi-please-read/ General maintenance - https://www.dodgejourneyforum.com/topic/18760-journey-maintenance-and-other-fun-facts/

Read my posts regarding the battery and the electrical system on the Journey. Things, that you should know and address before any electrical issues start. https://www.dodgejourneyforum.com/topic/18210-electrical-system-fyi-battery/ https://www.dodgejourneyforum.com/topic/18374-electrical-system-fyi-ground-system/

Read my posts regarding the battery and the electrical system on the Journey. Things, that you should know and address before any electrical issues start. https://www.dodgejourneyforum.com/topic/18210-electrical-system-fyi-battery/ https://www.dodgejourneyforum.com/topic/18374-electrical-system-fyi-ground-system/

High priority. Read my post on Transmission service. https://www.dodgejourneyforum.com/topic/18151-automatic-transmission-fyi-please-read/

Read this - https://www.dodgejourneyforum.com/topic/18760-journey-maintenance-and-other-fun-facts/

Go here! https://www.dodgejourneyforum.com/topic/18760-journey-maintenance-and-other-fun-facts/

Go here! https://www.dodgejourneyforum.com/topic/18760-journey-maintenance-and-other-fun-facts/

Go here! https://www.dodgejourneyforum.com/topic/18760-journey-maintenance-and-other-fun-facts/