2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 2828
* Fuel Level Sensor Replacement (See: Powertrain Management/Computers and Control Systems/Fuel Level Sensor/Service and Repair) for
the 6.0L (LFA) engine
* Fuel Level Sensor Replacement (2500 - 98.4L (26 gal) Tank - Front) ()Fuel Level Sensor Replacement (2500 - 43.5L (11.5 gal) Tank -
Rear) ()Fuel Level Sensor Replacement (1500 Series) ()Fuel Level Sensor Replacement (1500 Series w/E85) () for the 4.8L, 5.3L, 6.0L,
6.2L, or 7.0L engine
* Control Module References (See: Testing and Inspection/Programming and Relearning) for the ECM replacement, programming and setup
P2067
DTC P2067
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 P2067
- Fuel Level Sensor 2 Low Voltage
Diagnostic Fault Information
Circuit/System Description
The primary fuel level sensor and the secondary fuel level sensor change resistance in response to the fuel level. The engine control module (ECM)
monitors the signal circuit of the primary fuel level sensor, the secondary fuel level sensor, and the type of fuel in order to determine the fuel level.
For regular unleaded fuel the ECM monitors a constant signal. When the vehicle has approximately 20% or greater ethanol for E85 fuel
applications, the ECM controls a pulse cycle signal where it monitors the signal and calculates the fuel level percentage only during the on pulse of
approximately 100 ms.
When the fuel tanks are full, the sensor resistances of both fuel level sensors are low and the ECM senses a low signal voltage on both the signal
circuits of the primary fuel level sensor and the secondary fuel level sensor. When the fuel tanks are empty, the resistances of the fuel level sensors
are high and the ECM senses a high signal voltage. The ECM uses the signal circuit of the primary fuel level sensor and the secondary fuel level
sensor in order to calculate the percentage of remaining fuel in the tank. The ECM sends the fuel level percentage via the serial data circuit to the
instrument cluster in order to control the fuel gauge.
Conditions for Running the DTC
* The ignition is ON, with the engine running.
* The system voltage is between 11-18 V.
Conditions for Setting the DTC
* The secondary sender output is less than 0.5 V.
* The above condition is present for greater than 30 seconds.
Action Taken When the DTC Sets
* The fuel gauge defaults to empty.
* The low fuel indicator illuminates.
* The ECM records the operating conditions at the time that the diagnostic test fails. The ECM displays the failure information in the Failure
Records on the scan tool.
Conditions for Clearing the DTC
* The DTC becomes history when the conditions for setting the DTC are no longer present.
* The history DTC clears after 40 malfunction-free warm-up cycles.
