This bulletin applies to 2011-2013 Jeep Compass and Patriot vehicles equipped with a 2.4L engine and either the Continuously Variable Transaxle or the Continuously Variable Transaxle with Off-Road Crawl Ratio. Customers may say they hear a clatter or rattle noise coming from the engine on initial start after a long cold soak. The MIL may also be on, and DTC P050B (cold start ignition timing performance) may be set.
The repair involves installing revised heater hoses, routing the purge solenoid wire harness and installing revised PCM software with release 13.03 or higher.
1. Note: If the vehicle was built on or before March 1, 2012, replace the shifter cable before continuing. If the vehicle was built after March 1, 2012, ignore steps 2-11 and simply reprogram the PCM.
2. If the vehicle was built on or before March 1, 2012, after replacing the shifter cable, remove the right wheel inner splash shield and drain the coolant. Without removing the pressure cap and with the system cold and NOT under pressure, turn the draincock counterclockwise to open.
3. The coolant reserve bottle should empty first. Then remove the pressure cap and allow the cooling system to drain completely.
4. Remove both supply and return heater core hoses.
5. Install a new heater core supply hose P/N 05058822AB and return hose P/N 05058823AB.
6. Install the right wheel splash shield.
7. Remove the engine cover.
8. To ensure that the purge solenoid wiring harness does not come into contact with the heater hoses, the wiring harness will require a slight modification.
9. Loosely pull the purge solenoid wire harness straight and create a bend in the harness about 10mm (3/8- to 7/16-inch) away from the harness retaining clip edge. The bend will also create a natural bend after the current spot tape on the harness. Apply 3-4 wraps of electrical tape securing the bend to the harness.
10. Install the engine cover.
11. Fill the cooling system making sure there is no air trapped.
12. Install a battery charger prior to reprogramming to prevent battery voltage from dropping below 13.2 volts or rising above 13.5 volts.
13. Reprogram the PCM with software release 13.03 or higher. Clear any DTCs that may have set during the flash.