2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1967
瀚慖f the test lamp does not illuminate, test the low reference circuit terminal A for a short to voltage or an open/high resistance. If the circuit
tests normal, replace the K27 fuel pump control module.
6. If all circuits test normal, replace the fuel tank G12 fuel pump module.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Fuel Tank Fuel Pump Module Replacement (2500 LWB - 43.5L (11.5 gal) Tank Rear) (See: Powertrain Management/Fuel Delivery and Air
Induction/Fuel Pump/Service and Repair/Fuel Tank Fuel Pump Module Replacement (2500 LWB - 43.5L (11.5 Gal) Tank Rear))Fuel Tank
Fuel Pump Module Replacement (2500 LWB - 98.4L (26 gal) Tank Front) (See: Powertrain Management/Fuel Delivery and Air
Induction/Fuel Pump/Service and Repair/Fuel Tank Fuel Pump Module Replacement (2500 LWB - 98.4L (26 Gal) Tank Front))Fuel Tank
Fuel Pump Module Replacement (1500 SWB - 98.4L (26 gal) Tank + E85) (See: Powertrain Management/Fuel Delivery and Air
Induction/Fuel Pump/Service and Repair/Fuel Tank Fuel Pump Module Replacement (1500 SWB - 98.4L (26 Gal) Tank + E85))Fuel Tank
Fuel Pump Module Replacement (1500 Series) (See: Powertrain Management/Fuel Delivery and Air Induction/Fuel Pump/Service and
Repair/Fuel Tank Fuel Pump Module Replacement (1500 Series))Fuel Tank Fuel Pump Module Replacement (1500 LWB - 117.3L (31 gal)
Tank + E85) (See: Powertrain Management/Fuel Delivery and Air Induction/Fuel Pump/Service and Repair/Fuel Tank Fuel Pump Module
Replacement (1500 LWB - 117.3L (31 Gal) Tank + E85))
* Control Module References (See: Testing and Inspection/Programming and Relearning)for fuel pump control module replacement, setup,
and programming
P254F
DTC P254F
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptor
DTC P254F
- Engine Hood Switch Circuit
Diagnostic Fault Information
Circuit/System Description
The engine control module (ECM) monitors the voltage input of the hood open switch signal circuit and the hood open closed switch signal circuit.
With the hood open, the hood ajar portion of the switch is closed, grounding the hood ajar switch signal circuit from the ECM, and the hood closed
portion of the switch is open. With the hood closed, the hood closed portion of the switch is closed, grounding the hood closed switch signal circuit
from the ECM, and the hood ajar portion of the switch is open. During proper operation, the two separate voltage signals at the ECM should never
be at the same voltage.
Conditions for Running the DTC
The ECM continuously monitors for this DTC
Conditions for Setting the DTC
Both the hood open switch signal circuit and the hood closed switch signal circuit are simultaneously in an active or inactive state.
Action Taken When the DTC Sets
Engine starting will be disabled.
