P128C Jeep OBD Code Diagnostic Procedure

P128C Jeep OBD Code

TCM POWER CONTROL CIRCUIT 2 HIGH – TIPM
For a complete wiring diagram Refer to Section 8W.

  • When Monitored:

With the ignition on. Battery voltage greater than 10 volts.

 

  • Set Condition:A shorted condition is detected in the TIPM TCM Power control circuit.

 

Possible Causes
(T16) TRANSMISSION CONTROL OUTPUT CIRCUIT SHORT TO VOLTAGE
TOTALLY INTEGRATED POWER MODULE (TIPM)

 

Diagnostic Test

1. CHECK IF THE DTC IS ACTIVE

Ignition on, engine not running.

With the scan tool, read TIPM DTCs.

Is the status Active for this DTC?

Yes

  • Go To 2

No

  • Go To 4


2. (T16) TRANSMISSION CONTROL OUTPUT CIRCUIT SHORT TO VOLTAGE

  • Turn the ignition off.
  • Disconnect the TIPM C10 harness connector.
  • Disconnect the PCM C4 harness connector.
  • Measure the voltage of the (T16) Transmission Control Output circuit.

Is the voltage above 10.0 v?

Yes

  • Repair the (T16) Transmission Control Output circuit for a short to voltage.

 

  • Perform 42RLE TRANSMISSION VERIFICATION TEST(Refer to 21 – TRANSMISSION/TRANSAXLE/AUTOMATIC – 42RLE – STANDARD PROCEDURE)

 

No

  • Go To 3


3. TOTALLY INTEGRATED POWER MODULE

  • Using the schematics as a guide, inspect the wire harness and connectors.
  • Check the TIPM harness connector terminals for corrosion, damage, or terminal push out.
  • Pay particular attention to all power and ground circuits.

Were any problems found?

Yes

  • Repair as necessary.

 

  • Perform 42RLE TRANSMISSION VERIFICATION TEST(Refer to 21 – TRANSMISSION/TRANSAXLE/AUTOMATIC – 42RLE – STANDARD PROCEDURE)

 

No

  • Replace the Totally Integrated Power Module per Service Information.

 

  • Perform 42RLE TRANSMISSION VERIFICATION TEST(Refer to 21 – TRANSMISSION/TRANSAXLE/AUTOMATIC – 42RLE – STANDARD PROCEDURE)

 


4. INTERMITTENT WIRING AND CONNECTORS

  • The conditions necessary to set this DTC are not present at this time.
  • Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
  • While monitoring the scan tool data relative to this circuit, wiggle test the wiring and connectors.
  • Look for the data to change or for the DTC to reset during the wiggle test.

Were any problems found?

Yes

  • Repair as necessary.

 

  • Perform 42RLE TRANSMISSION VERIFICATION TEST(Refer to 21 – TRANSMISSION/TRANSAXLE/AUTOMATIC – 42RLE – STANDARD PROCEDURE)

 

No

  • Test complete.
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