Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSJEEP2009PATRIOT 4WD L4-2.0LREPAIR AND DIAGNOSISTRANSMISSION AND DRIVETRAINCONTINUOUSLY VARIABLE TRANSMISSION/TRANSAXLECONTROL MODULETESTING AND INSPECTIONTCM INITIALIZATION
2009 Jeep Patriot 4WD L4-2.0L
TCM Initialization
2009 Jeep Patriot 4WD L4-2.0LSECTION TCM Initialization
TRANSMISSION CONTROL MODULE INITIALIZATION
NOTE: Refer to the following table when the Transmission Control Module (TCM) and/or transaxle has been replaced to determine if the TCM memory must be erased.
INITIAL LEARN (BRAND-NEW MODULE, MEMORY ALREADY CLEAR)
Battery must be connected. If the Totally Integrated Power Module (TIPM) is to be configured, configure the TIPM and then turn ignition key to OFF/LOCKED briefly, then back to RUN. The shifter must be in PARK or NEUTRAL, engine not running.
1. Turn the ignition key to RUN for 4 seconds to allow reading of new values.
2. Turn ignition key to OFF/LOCKED for 2 seconds to allow storing new values in EEROM.
3. Turn the ignition key to RUN, with scan tool clear DTCs.
4. Turn ignition key to OFF/LOCKED for 2 seconds.
5. After at least 7 seconds, read DTCs.
6. If DTCs resets Testing and Inspection
RELEARN, AFTER REPLACING A TRANSAXLE
1. Turn ignition key to RUN.
2. Clear learning memory using the scan tool.
3. Turn the ignition key to OFF/LOCKED for 2 seconds.
4. Turn the ignition key to RUN Clear DTCs.
5. Turn the ignition key to OFF/LOCKED for 2 seconds.
6. Turn ignition key to RUN.
7. After at least 7 seconds, read DTCs.
8. If DTCs resets Testing and Inspection
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.