Chevrolet Trax: DTC P0461-P0464, P2066, P2067, OR P2068 (AWD): Fuel level sensor
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 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 1 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 both sensor to
determine the fuel level. When the
fuel tank is full, the resistances of both fuel level sensors are low. When the
fuel tank is empty, the resistances
of the fuel level sensors are high. The ECM uses the signal voltages of the
primary fuel level sensor and the
secondary fuel level sensor to calculate the percentage of remaining fuel in the
tank. The ECM sends the fuel
level percentage via serial data to the body control module (BCM). The BCM then
sends the fuel level
percentage via serial data to the instrument cluster to control the fuel gauge.
Conditions for Running the DTC
- The engine is running
- The system voltage is between 11-16 V
Conditions for Setting the DTC
P0461 or P2066
The ECM detects a change in fuel level of less than a specified amount (typically
3-10 L or 0.8-2.6 gal) over a
specified driving distance (typically 240-320 km or 150-200 miles).
P0462 or P2067
- The signal voltage is less than 0.25 V.
- The above conditions must be met for 5 seconds.
P0463 or P2068
- The signal voltage is greater than 4.7 V.
- The above conditions must be met for 5 seconds.
P0464
- The fuel level change is greater than 10%.
- The above conditions must be met for 30 seconds.
- DTC P0464 runs and fails 2 out of 3 test cycles.
Action Taken When the DTC Sets
- P0461, P0462, P0463, P0464, P2066, P2067 and P2068 are Type B DTCs
- The fuel gauge defaults to empty
- The low fuel indicator illuminates
Conditions for Clearing the DTC
- P0461, P0462, P0463, P0464, P2066, P2067 and P2068 are Type B DTCs
- 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 (Encore), Instrument Cluster Schematics (Trax)
Connector End View Reference
WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS -
INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT
CONNECTOR END VIEWS - INDEX - TRAX
Description and Operation
Instrument Cluster Description and Operation
Electrical Information Reference
- Circuit Testing
- Connector Repairs
- Testing for Intermittent Conditions and Poor Connections
- Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (LUV) ,
Powertrain Diagnostic Trouble
Code (DTC) Type Definitions (2H0)
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Ignition ON.
- Verify the scan tool Fuel Level Sensor Left Tank parameter is between
0.5-3.5 V and varies with fuel
level.
- If not between 0.5-3.5 V or does not vary with fuel level
Refer to Primary Fuel Level Sensor Malfunction in Circuit/System Testing
- If between 0.5-3.5 V and varies with fuel level
- Verify the scan tool Fuel Level Sensor Right Tank parameter is between
0.5-3.5 V and varies with fuel
level.
- If not between 0.5-3.5 V or does not vary with fuel level
Refer to Secondary Fuel Level Sensor Malfunction in Circuit/System Testing
- If between 0.5-3.5 V and varies with fuel level
- All OK.
Circuit/System Testing
Primary Fuel Level Sensor Malfunction
- Ignition OFF and all vehicle systems OFF, disconnect the harness
connector at the A7 Fuel Pump and
Level Sensor Assembly. It may take up to 2 minutes for all vehicle systems
to power down.
- Test for less than 10 ohms between the low reference circuit terminal 3
and ground.
If 10 ohms or greater
- Ignition OFF, disconnect the harness connector at the K20 Engine Control
Module.
- Test for less than 2 ohms in the low reference circuit end to end.
- If 2 ohms or greater, repair the open/high resistance in the circuit.
- If less than 2 ohms, replace the K20 Engine Control Module.
- If less than 10 ohms
- Ignition ON.
- Verify the scan tool Fuel Level Sensor Left Tank parameter is greater
than 4.8 V.
- Ignition OFF, disconnect the harness connector at the K20 Engine Control
Module.
- Test for infinite resistance between the signal circuit terminal 4 and
ground.
- If less than infinite resistance, repair the short to ground on the
circuit.
- If infinite resistance, replace the K20 Engine Control Module.
- If greater than 4.8 V
- Install a 3 A fused jumper wire between the signal circuit terminal 4
and the low reference circuit
terminal 3.
- Verify the scan tool Fuel Level Sensor Left Tank parameter is less than
0.2 V.
If 0.2 V or greater
- Ignition OFF, disconnect the harness connector at the K20 Engine Control
Module, ignition ON.
- Test for less than 1 V between the signal circuit and ground.
- If 1 V or greater, repair the short to voltage on the circuit.
- If less than 1 V
- Ignition OFF
- Test for less than 2 ohms in the signal circuit end to end.
- If 2 ohms or greater, repair the open/high resistance in the circuit.
- If less than 2 ohms, replace the K20 Engine Control Module.
- If less than 0.2 V
- Test or replace the B46 Fuel Level Sensor.
Secondary Fuel Level Sensor Malfunction
- Ignition OFF and all vehicle systems OFF, disconnect the harness
connector at the B46B Fuel Level
Sensor - Secondary. It may take up to 2 minutes for all vehicle systems to
power down.
- Test for less than 10 ohms between the low reference circuit
terminal 3 and ground.
If 10 ohms or greater
- Ignition OFF, disconnect the harness connector at the K20 Engine Control
Module.
- Test for less than 2 ohms in the low reference circuit end to end.
- If 2 ohms or greater, repair the open/high resistance in the circuit.
- If less than 2 ohms, replace the K20 Engine Control Module.
- If less than 10 ohms
- Ignition ON.
- Verify the scan tool Fuel Level Sensor Right Tank parameter is greater
than 4.8 V.
If 4.8 V or less
- Ignition OFF, disconnect the harness connector at the K20 Engine Control
Module.
- Test for infinite resistance between the signal circuit terminal 4 and
ground.
- If less than infinite resistance, repair the short to ground on the
circuit.
- If infinite resistance, replace the K20 Engine Control Module.
- If greater than 4.8 V
- Install a 3 A fused jumper wire between the signal circuit terminal 4
and the low reference circuit
terminal 3.
- Verify the scan tool Fuel Level Sensor Right Tank parameter is less than
0.2 V.
- Ignition OFF, disconnect the harness connector at the K20 Engine Control
Module, ignition ON.
- Test for less than 1 V between the signal circuit and ground.
- If 1 V or greater, repair the short to voltage on the circuit.
- If less than 1 V
- Ignition OFF
- Test for less than 2 ohms in the signal circuit end to end.
- If 2 ohms or greater, repair the open/high resistance in the circuit.
- If less than 2 ohms, replace the K20 Engine Control Module.
- If less than 0.2 V
- Test or replace the B46B Fuel Level Sensor - Secondary.
Component Testing
- Ignition OFF, remove the appropriate Fuel Level Sender.
- Sweep the Fuel Level Sensor through its full range of motion while
measuring resistance between the
signal terminal 4 and the low reference terminal 3.
- Test for a minimum resistance value of 37-43 ohms and a maximum value of
245-255 ohms without any
spikes or dropouts.
- If minimum resistance is not 37-43 ohms, maximum resistance is not
245-255 ohms, or if
there are any spikes or dropouts
Replace the appropriate Fuel Level Sensor.
- If minimum resistance is 37-43 ohms, maximum resistance is 245-255
ohms, and if there are
no spikes or dropouts
- All OK.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
- Displays and Gauges Component Replacement Reference
- Control Module References for engine control module or instrument
cluster replacement, programming,
and setup
READ NEXT:
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.
Diag
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.
Diag
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.
Diag
SEE MORE:
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
D
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 Descriptor
DT