Bulletin No.: PIT5391D
Published date: 03/15/2018

Preliminary Information
PIT5391D No Crank / Start Then Immediate Stall / SES MIL / Service 4WD / Relay Clicking / Rearview
Camera Inop / DTC (Inspect Ignition 1 voltage)
Models
Brand:

Model:

Model Years:

VIN:
from

Engine:

to

Transmissions:

Cadillac

Escalade

2015 - 2018

All

All

All

All

Chevrolet

Silverado 1500

2014

All

All

All

All

Chevrolet

Silverado

2015 - 2018

All

All

All

All

Chevrolet

Suburban

2015 - 2018

All

All

All

All

Chevrolet

Tahoe

2015 - 2018

All

All

All

All

GMC

Sierra 1500

2014

All

All

All

All

GMC

Sierra

2015 - 2018

All

All

All

All

GMC

Yukon

2015 - 2018

All

All

All

All

Supersession Statement
This PI was superseded to add the 2018 model year and update the condition and recommendation sections. Please discard
PIT5391C.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition / Concern
Some owners may comment of any of the following symptoms:
- No crank or a start then immediate stall
- SES MIL may not be on when the ignition is in the Run position
- Any of the following DTC's 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 DTC's C0364 and/or U0403 may set
- The sound of a relay clicking while driving
- Rearview camera inoperative when the vehicle is shifted into reverse
- Engine stays running with ignition off until 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)
These concerns could be caused by a loss of ignition 1 voltage. 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:
Example wiring diagram for the KR73 Ignition Main Relays and fuses:
Pickup's - Document ID: 3619755
SUV's - Document ID: 4079484
The loss of ignition 1 voltage may be caused by:
-Either or both KR73 Ignition Main Relays not turning on to provide power to their respectable fuses.
-Terminal issues at a fuse block connector where the Ignition 1 circuits exit the fuse block, example Document ID: 4232460, circuit 439
at the Underhood Fuse Block connector X2 terminal M7. In these situations, the KR73 Ignition Main Relays are turning on and
providing power to their respective Ignition 1 fuses, but there will be no Ignition 1 power to their respective module/component, due to
the terminal issue at the fuse block.

Recommendations / Instructions
The following are common areas for these concerns:
1. Inspect ALL the 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
-Terminal M7 or A3 at connector X2 for circuit 439 (Depending on model and year, circuit 439 can vary in terminal location. Refer to SI
for your vehicle)
2. Inspect for any backed out terminals, poor terminal fit and/or bent/twisted terminals at the Left I/P Fuse Block-X51L.
The most common terminals with these issues have been:
-Terminal 42 at connector X1, for circuit 5199
-Terminal 44 at connector X2, for circuit 1850

3. Circuit 5199 under the driver's sill plate for being damaged/corroded, as shown below.

Repair any wiring / terminal issues using the appropriate SI wiring repair documentation.

Warranty Information
Please refer to latest version of bulletin 10-00-89-005 for warranty information on wire/connector repairs.

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved
without completing every step, the remaining steps do not need to be performed.

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