Odie,

A. MAIN CONTACTOR COIL WIRING FAULT
B. FAULTY B(+) CONNECTION
C. MAIN CONTACTOR STUCK OPEN
D. FAULTY TRACTION CONTROLLER



1. Conduct a visual inspection of all connectors/wiring associated with the fault code.
Are any faults detected/observed?
YES: Repair/replace connector or wiring associated with faults found. Refer to the appropriate Electrical
SystemSRM.
NO: Proceed to Step 2.
2. Re-key the vehicle.
Is the code still present?
YES: Proceed to CAUSE A.
NO: Problem may be intermittent.
CAUSE A - MAIN CONTACTOR COIL WIRING FAULT
PROCEDURE OR ACTION:
NOTE: Key in ON position.
1. Disconnect the main contactor coil's positive socket terminal TS07 and measure voltage between the terminal
and B(-).
Is voltage 24 ± 2.5 Vdc?
YES: Disconnect battery and proceed to Step 2.
NO: Inspect circuit 239 for open or short.
2. Disconnect the traction controller connector CPS01 and the contactor coil negative terminal TS08. Measure
continuity between TS08 and socket 6 of the traction controller CPS01.
Is continuity present?
YES: Reconnect battery and all connectors. Proceed to CAUSE B.
NO: Inspect ground control circuit 075 for open or short.
CAUSE B - FAULTY B(+) CONNECTION
PROCEDURE OR ACTION:
1. Review basic electrical troubleshooting information and perform steps in the Voltage Checks. Rekey the truck
and check for codes.
Is code still present?
YES: Proceed to CAUSE C.
NO: Ensure all terminal lugs are appropriately torqued.
ELECTRICAL SYSTEM Diagnostic Trouble Codes
Check the Service Manual section in Hypass Online for possible updates and check pertinent Grams
Confidential/Proprietary - Do Not Copy or Duplicate 9030-20-25
CAUSE C - MAIN CONTACTOR STUCK OPEN
PROCEDURE OR ACTION:
1. Move tiller arm to UP position and measure voltage between controller B(+) and controller B(-) terminal.
Operate turtle switch while measuring voltage.
Is voltage present between B(+) and B(-) terminals?
YES: Proceed to CAUSE D.
NO: Replace faulty main contactor.
CAUSE D - FAULTY TRACTION CONTROLLER
PROCEDURE OR ACTION:
1. If no faults are found, replace controller. Make sure to indicate the DTC code(s) on the warranty claim to
include an accurate problem description leading to controller replacement.

Check the inline fuses for good connection. Have had multiple issues with failed crimps or broken wires. Make sure all connections going to the contactor are clean and tight. Good Luck