Service Engine Soon/Service Vehicle Soon Lamp Illuminated, Transmission Slips, No Upshift or Erratic Shifts, DTCs P0753, P1860 Set (Replace Engine Wiring Junction Block (UBEC) Connector Terminals)

Some customers may comment on one or more of the following conditions:

Upon investigation, the technician may find transmission DTCs P0753 and P1860 set.

These conditions may be due to deformed or collapsed terminals in the Engine Wiring Junction Block (Underhood Bussed Electrical Center (UBEC)) connectors causing a poor connection.

1. Remove the Underhood Electrical Center/Engine Wiring Junction Block base assembly. Refer to the Underhood Electrical Center or Junction Block Replacement procedure in the Wiring Systems sub-section of the Service Manual or SI document #630004 for Bonneville and LeSabre and #883175 for Park Avenue.



2. Inspect ALL of the terminals in UBEC connectors C1, C2 and C3. Use Terminal Test Kit, J 35616A, in order to determine proper terminal tension.

•	If any of the terminals are visibly damaged/deformed/collapsed (1) or are suspected of creating a faulty connection, go to the repair procedure in this bulletin.

•	If ALL of the terminals are NOT damaged and proper connections can be made, perform the standard diagnostic procedures in the appropriate Service Manual.

Tools Required
J 38125-C Terminal Repair Kit

Important: Refer to the Reference Guide in the Terminal Repair Kit for the proper removal and crimping tool and part replacement information for the 68-way (female) Metri-Pack 280 Series connector.

1. Remove the Terminal Position Assurance (TPA) device from the connector.
2. Insert the proper removal tool into the front of the connector body in order to disengage the flexible lock under the damaged terminal(s).



3. Gently pull on the wire to remove the terminal through the back of the connector.
4. Cut the wire as close to the old terminal as possible.
5. Strip 5 mm (3/16 in) of insulation from the wire.
6. Use the proper crimping tool and crimp a new terminal to the wire.
7. Solder the crimp with rosin core solder.
8. Insert the new terminal and wire into the back of the connector. Ensure the terminal is seated and the flexible lock is engaged.
9. Install the Terminal Position Assurance (TPA) device into the connector.
10. Install the Underhood Electrical Center/Engine Wiring Junction Block base assembly. Refer to the Underhood Electrical Center or Junction Block Replacement procedure in the Wiring Systems sub-section of the Service Manual or SI document #630004 for Bonneville and LeSabre and #883175 for Park Avenue.
11. Verify that the condition(s) has been corrected and DTCs are cleared.

For vehicle repaired under warranty, use: