2010 Cadillac CTS Sedan AWD V6-3.0L Page 1788
Repair/Fuel Level Sensor Replacement - Left Side) for the 3.6L engine
* Fuel Level Sensor Replacement - Left Side (See: Powertrain Management/Computers and Control Systems/Fuel Level Sensor/Service and
Repair/Fuel Level Sensor Replacement - Left Side) for the 4.8L, 5.3L, 6.0L, 6.2L or 7.0L engines
* Control Module References (See: Testing and Inspection/Programming and Relearning) for the ECM replacement, setup, and programming
P2068
DTC 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 Descriptor
DTC P2068
- Fuel Level Sensor 2 High Voltage
Diagnostic Fault Information
Circuit/System Description
The primary fuel level sender and the secondary fuel level sender changes resistance based on fuel level. The engine control module (ECM)
monitors the signal circuits of the primary fuel level sender and the secondary fuel level sender in order to determine the fuel level. When the fuel
tank is full, the resistances of both fuel level senders are low and the ECM senses a low signal voltage on both the signal circuits of the primary fuel
level sender and the secondary fuel level sender. When the fuel tanks are empty, the resistances of the fuel level senders are high and the ECM
senses a high signal voltage. The ECM uses the signal circuits of the primary fuel level sender and the secondary fuel level sender in order to
calculate the percentage of remaining fuel in the tank. The ECM sends the fuel level percentage via serial data circuit 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 10-18 V.
Conditions for Setting the DTC
* The secondary fuel level signal is about 3.5 V.
* The above condition is present for about 60 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.
Reference Information
Schematic Reference
Instrument Cluster Schematics (See: Diagrams/Electrical Diagrams/Instrument Panel, Gauges and Warning Indicators/System Diagram/Instrument
