GM Service Manual Online
For 1990-2009 cars only

Diagnostic Instructions

    • Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
    • Review Strategy Based Diagnosis for an overview of the diagnostic approach.
    •  Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC P2066: Fuel Level Sensor 2 Circuit Performance

DTC P2636: Fuel Transfer Pump Flow Insufficient

Diagnostic Fault Information

Circuit

Short to Ground

High Resistance

Open

Short to Voltage

Signal Performance

Fuel Level Sensor 1 Signal

P0462

1

P0463

P0464

P0463

P0461

Fuel Level Sensor 2 Signal

P2067

1

P2068

P2068

P2066 or P2636

Fuel Level Sensor Low Reference Circuit

--

1

P0463

P2068

P0464

P0463

P2068

P0461

P2066 or P2636

1. Fuel Gage Inaccurate or Inoperative

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 gage.

Conditions for Running the DTC

P2066

    • The engine is running.
    • No VSS DTCs set.

P2636

    • The engine is running.
    • DTC P2636 runs continuously once the conditions have been met.

Conditions for Setting the DTC

P2066

    • The secondary fuel tank is equal to or greater than 3.3 L (.87 gal) and the ECM does not detect a change in the secondary fuel level of at least 3 L (0.79 gal) over a distance of 100 km (62 mi).
    • The ECM detects that the primary fuel tank is less than 28.5 L (7.5 gal) and the secondary fuel tank is more than 3.3 L (.87 gal) and the condition is present for 30 minutes.
    • The ECM detects that the primary fuel tank is greater than 28.5 L (7.5 gal) and the secondary fuel tank is less than 3.3 L (.87 gal) over a distance of 200 km (124.2 mi).

P2636

The ECM detects that the primary fuel tank is less than 28.5 L (7.5 gal) and the secondary fuel tank is more than 3.3 L (.87 gal) and the condition is present for 30 minutes.

Action Taken When the DTC Sets

    • The fuel gage defaults to empty.
    • The malfunction indicator lamp (MIL) will not illuminate.
    • The driver information center (DIC) displays the FUEL LEVEL LOW message.
    • 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.

Diagnostic Aids

Check if DTC P0461 is also set. Both DTCs P0461 and P2066 may set simultaneously if the vehicle was refueled with the ignition ON or engine RUNNING. Always refuel with the ignition OFF.

Reference Information

Schematic Reference

Instrument Cluster Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Instrument Cluster Description and Operation

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Component Testing

  1. Ignition OFF, remove the secondary fuel level sender and verify there are no obstructions interfering with the fuel level sender.
  2. If any interference is present, repair the fuel sender interference.
  3. Ignition OFF, disconnect the harness connector at the secondary fuel level sensor.
  4. While sweeping the secondary fuel level sensor through its full range of motion, test for a minimum value less than 41 ohms and a maximum value greater than 119 ohms between signal terminal 1 and the low reference terminal 4.
  5. If not within the specified range, replace the fuel level sensor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Fuel Level Sensor Replacement - Right Side
    •  Control Module References for the ECM replacement, setup, and programming