No Start, No Crank, Service Engine Soon (SES) Lamp On, Loss of Backlighting on PRNDL Display and/or DTCs P2761, P0712, P0713, P0716, P0717, P0748 Set (Repair/Re-route Transmission Wiring Harnesses)

Customers may comment on a no start, no crank, an Illuminated service engine soon (SES) lamp, or the loss of backlighting on the PRNDL display.

A technician may find DTCs P2761, P0712, P0713, P0716, P0717 and/or P0748 set.

The transmission wiring harness may be misrouted and pulled tight against the transmission shift cable. This condition may cause wire chafing or a poor connection at the transmission connector.

Inspect the transmission wiring harness for chafing against the shift cable bracket. Inspect the transmission wiring harness for excessive tension at the transmission connector due to the routing of transmission wiring harness. Repair chafed wiring and re-route the transmission wiring harness

1. Inspect the transmission wiring harness for chafing against the shift cable bracket.
2. Inspect the transmission wiring harness for excessive tension on the transmission connector. The transmission connector may be loose.

•	If wire harness tension is found, proceed to Step 3.

•	If wire chafing is found, proceed to Step 4.

•	If wire chafing or wire harness tension is not present, refer to diagnostic information in SI.




3. Trace the engine wire harness back from the transmission connector toward the bulkhead. Just forward of the braided brake lines, the transmission wire harness breakout is taped to the main engine wiring harness in a horse shoe shape. Cut the tape back in this area to release the tension on the harness. Proceed to Step 5.
4. Repair the portion of the wire harness that is chafed, if required.



5. Re-route the transmission breakout portion of the wiring harness away from the shifter cable, if required.
6. Test the vehicle to ensure that no DTCs are set or that the SES lamp or PRNDL display backlight is on.

For vehicles repaired under warranty, use: