2010 Cadillac Truck SRX FWD V6-3.0L Page 1920
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Primary Fuel Level Sensor Replacement (See: Powertrain Management/Computers and Control Systems/Fuel Level Sensor/Service and
Repair)
* Secondary Fuel Tank Module Replacement (See: Powertrain Management/Fuel Delivery and Air Induction/Fuel Tank Unit/Service and
Repair/Secondary Fuel Tank Module Replacement)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for the ECM replacement, programming and setup
P2068
DTC P0461-P0464, P2066, P2067, or P2068
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 Descriptors
DTC P0461
- Fuel Level Sensor 1 Performance
DTC P0462
- Fuel Level Sensor 1 Circuit Low Voltage
DTC P0463
- Fuel Level Sensor 1 Circuit High Voltage
DTC P0464
- Fuel Level Sensor Circuit Intermittent
DTC P2066
- Fuel Level Sensor 2 Performance
DTC P2067
- Fuel Level Sensor 2 Circuit Low Voltage
DTC P2068
- Fuel Level Sensor 2 Circuit High Voltage
Diagnostic Fault Information
Circuit/System Description
The primary fuel level sensor and the secondary fuel level sensor change resistance based on fuel level. The engine control module (ECM) monitors
the signal circuits of the primary fuel level sensor and the secondary fuel level sensor in order to determine the fuel level. When the fuel tank is full,
the 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 tank is empty, the resistances of the fuel level sensors are high and the ECM senses a high
signal voltage. The ECM uses the signal circuits 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 High Speed CAN-Bus to the body control module (BCM).
The BCM then sends the fuel level percentage via Low Speed CAN-Bus to the instrument cluster in order to control the fuel gauge.
Conditions for Running the DTC
* The engine is running
* The system voltage is between 11-16 V
