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 LIMITED, ED3, AWD, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTCOMMUNICATION DEVICESDTCS P128C TO U1105 (TIPM)P128E-TCM POWER CONTROL CIRCUIT 2 OVERCURRENTDIAGNOSTIC TEST

2009 Jeep Patriot Limited, ED3, AWD, Standard

Diagnostic Test

2009 Jeep Patriot Limited, ED3, AWD, StandardSECTION Diagnostic Test

CHECK IF THE DTC IS ACTIVE
1. Ignition on, engine not running.
2. With a scan tool, read TIPM DTCs.
  Is the DTC active at this time?
  
  Yes
  - Go to step 2
  No
  - Go to step 4
CHECK IF THE DTC IS ACTIVE
1. Ignition on, engine not running.
2. With a scan tool, read Transmission DTCs.
  Are there any Input or Output Speed Sensor or Transmission Range Sensor (TRS) DTCs present?
  
  Yes
  - Refer to appropriate DTC Based Diagnostics article and perform the appropriate diagnostic procedure.
  - Perform the CVT VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure .
  No
  - Go to step 3
CHECK THE TCM
1. Disconnect the amp meter from the TIPM C10 harness connector and battery positive.
2. Disconnect the TCM C1 harness connector.
3. Connect the positive probe of an ammeter to battery positive and connect the negative probe to the (T16) Transmission Control Output circuit in the TIPM C10 harness connector.
4. Read the amperage on the ammeter.
  Does the amperage read below 2.0 amps?
  
  Yes
  - Using the schematics as a guide, check the Transmission Control Module (TCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the TCM in accordance with the Service Information.
  - Perform the CVT VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure .
  No
  - Replace the Totally Integrated Power Module in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .
CHECK THE WIRING AND CONNECTORS
1. The conditions necessary to set this DTC are not present at this time.
2. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.
3. Wiggle the wires while checking for shorted and open circuits.
  Were there any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the CVT VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure .
  No
  - Test Complete.

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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.