2010 Cadillac CTS Sedan AWD V6-3.6L Page 2003
Conditions for Running the DTC
* Before the engine control module (ECM) can report DTC P2636 failed, DTCs P0461, P0462, P0463, P2066, P2067, and P2068 must run and
pass.
* The ignition 1 signal parameter is between 10-18 volts.
* The engine speed is greater than 240 RPM.
* DTC P2636 runs continuously once the above conditions exist for greater than 4 minutes.
Conditions for Setting the DTC
The ECM detects that the right side fuel level is less than 11 percent and the left side fuel level is greater than 22 percent.
Action Taken When the DTC Sets
DTC P2636 is a Type C DTC.
Conditions for Clearing the MIL/DTC
DTC P2636 is a Type C DTC.
Diagnostic Aids
Depending on the current fuel level, it may be difficult to locate a malfunctioning fuel level sensor. The condition may only occur when the fuel
level is full or near empty. The fuel level sensor unit may need to be removed for further diagnosis. A fuel level sensor that has an intermittent
condition causes this DTC to set.
Reference Information
Schematic Reference
Engine Controls Schematics (LLT) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)Engine Controls Schematics
(LF1) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Fuel System Description (See: Powertrain Management/Computers and Control Systems/Description and Operation/Fuel System Description)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit
Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code
(DTC) Type Definitions)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
1. Engine idling for 5 minutes, observe the DTC information with a scan tool. DTC P2636 should not set.
2. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the
conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector of the left side fuel level sensor.
2. Ignition ON, verify the scan tool Fuel Level Sensor Left Tank voltage parameter is at 5.0 V.
瀚慖f less than the specified range, test the signal circuit for a short to ground. If the circuit tests normal, replace the ECM.
