C 1500 Truck 2WD V8-6.5L DSL Turbo VIN F (1998)
from the crank position. Watch the Tech 2 parameter while cranking or immediately after releasing the key. If a PASSLOCK fault is present, discontinue
all Powertrain diagnostics and refer to the vehicle theft deterrent system diagnostics in the proper vehicle line Service Manual. For example, the C/K
truck OBD system check for the 6.5L diesel is located on Page 6-2334 in Book 4. If DTC's are set, refer to the applicable chart. The VTD diagnostics are
located in Section 9D or Book 1.
An alternative method of diagnosing PASSLOCK is to use the following Tech 2 diagnostic path:
1.
Body system
2.
Data list
3.
Data list parameter: PASSLOCK code "OPEN" If the word open exists under this parameter, a PASSLOCK fault exists and the module is not
receiving a message from the hall sensor. The vehicle will not start. The message "VALID CODE 1" (or 2, 3, etc. up to 10) will be displayed when
the PASSLOCK module is receiving a valid message from the hall sensor.
Either of the above diagnostic methods may be used to determine PASSLOCK system status even it no DTC's are set.
Refer to the appropriate vehicle line Service Manual for additional diagnostic information on the PASSLOCK system or call the applicable divisional
Technical Assistance Center.
