Volt L4-1.4L Elect (2011)
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Engine Hood Switch Performance
DTC P257E
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Engine Hood Switch Circuit Low Voltage
DTC P257F
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Engine Hood Switch Circuit High Voltage
Diagnostic Fault Information
Circuit/System Description
The hybrid powertrain control module 2 applies B+ to the hood ajar signal 2 circuit and monitors the voltage to determine the position of the hood. The
hood ajar switch contains a multiplexed resistor. This resistor will vary the voltage seen by the hybrid powertrain control module 2 by pulling down the
applied voltage based on the position of the switch.
Conditions for Running the DTC
Propulsion system is active.
Conditions for Setting the DTC
P257D
The hood ajar switch signal 2 voltage as measured by the hybrid powertrain control module 2 is not within a valid voltage range.
P257E
The hybrid powertrain control module 2 detects a short to ground in the hood ajar signal input to the hybrid powertrain control module 2.
P257F
The hybrid powertrain control module 2 detects a short to voltage or an open/high resistance in the hood ajar signal input to the hybrid powertrain
control module 2.
Action Taken When the DTC Sets
The engine will start and run whenever the ignition is ON and the vehicle speed is less than 5 kph (3 mph).
Conditions for Clearing the DTC
DTCs P257D, P257E, and P257F are Type B DTCs.
Reference Information
Schematic Reference
Immobilizer Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Hood Ajar Indicator Description and Operation (See: Body and Frame/Doors, Hood and Trunk/Description and Operation)
Electrical Information Reference
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Circuit Testing
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Connector Repairs
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Testing for Intermittent Conditions and Poor Connections
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Wiring Repairs