Service Information

Volt

DTC P1461

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

DTC P1461: Evaporative Emission (EVAP) System Pressure Incorrect During Fuel Fill Door Open Request

The Hybrid Powertrain Control Module 2 (HPCM2) monitors the fuel tank pressure (FTP) during a fuel fill door open request. If the FTP pressure does not fall within a predetermined range within 30 seconds this DTC sets.

Conditions for Running the DTC

•	The HPCM2 is active.

•	The fuel fill door open switch is pressed.

Conditions for Setting the DTC

The Hybrid Powertrain Control Module 2 detects the FTP sensor reading does not fall within a predetermined value for greater than 30 s.

Action Taken When the DTC Sets

The DTC P1461 is a type A DTC.

Conditions for Clearing the DTC

The DTC P1461 is a type A DTC.

Diagnostic Aids

•	A restriction in the EVAP canister or vent lines that might hold FTP pressure could affect this.

•	This DTC will not prevent the fuel fill door from opening.

•	A vent valve stuck closed could affect this.

•	Ensure that the reference port on the FTP sensor is unobstructed.

•	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.

Reference Information

Schematic Reference

•	Engine Controls Schematics

•	Release Systems Schematics : Tailgate Schematics → Release System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

•	Evaporative Emission Control System Description

•	Hybrid Modes of Operation Description

•	Fuel Fill Door Description and Operation (Fuel Door)

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

Scan Tool Reference

Control Module References for scan tool information

Special Tools

For equivalent regional tools, refer to Special Tools : Diagnostic Tools .

Circuit Verification

Vehicle in Service Mode, observe and note the FTP pressure with a scan tool.
Request a refuelling event. The FTP reading should be at 0 inches of H20.

⇒	If not, test and repair any vent restriction.

Using a scan tool, observe the following HPCM2 Fuel System parameters:

•	Refuel System Vent Requested

•	Refuel System Vented

⇒	These parameters should show yes for vented.

Repair Instructions

•	Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

•	Fuel Tank Pressure Sensor Replacement

•	Control Module References for ECM and Hybrid Control Module 2 replacement, setup, and programming.