News Technical Service Bulletins

Caddy Ignition Woes

Order Reprints
Example: Circuit 5199 (under driver sill plate) with damage and corrosion.

This bulletin applies to 2015-2019 Cadillac Escalade vehicles. Some owners may comment about a no-crank or a start followed by an immediate stall. The SES MIL may not be on when the ignition is in the Run position. Any of the following DTCs may be set: B1370, B1325, P0650, P263A, P263B, P0513, P129D, P2535, and/or P0262B.

Trucks equipped with 4WD may have a Service 4WD message and DTCs C0364 and/or U0403 set. The sound of a relay clicking may be heard while driving. The rearview camera may be inoperative when the transmission is shifted into reverse. The engine may stay running with the ignition off until a door is opened.

Note: This symptom is not caused by a loss of ignition 1 voltage, but a loss of ground to the ignition main relay. There are two KR73 ignition main relays, one located in the underhood fuse block X50A, and the other in the left I/P fuse block X51L, that both provide power to several different fuses.  

A loss of ignition 1 voltage may be caused by either or both KR73 ignition main relays not turning on to provide power to their respective fuses; or terminal issues at a fuse block connector where the ignition 1 circuits exit at the fuse block, In these issues, the KR73 ignition main relays are turning on and providing power to their respective fuses, but there will be no ignition 1 power to their respective modules/components due to terminal issues at the fuse block.

Inspect all underhood fuse block X50A connectors for any backed-out terminals, poor terminal fit and/or bent/twisted terminals. The most common terminals with these issues have been terminal M5 at connector X4, for circuit 5199; and terminal M7, A2 or A3 at connector X2 for circuit 439.

Inspect  fuse block X51L for backed out terminals, poor terminal fit and bent/twisted terminals. The most common terminals with these issues have been: Terminal 42 at connector X1 for circuit 5199 and terminal 44 at connector X2 for circuit 1850.

Related Articles

Cadillac Connection Woes

Toyota Fuel Cap Woes

Shock Issue Gives Chevy Magnaride Suspension Woes

You must login or register in order to post a comment.