Volt L4-1.4L Elect (2011)
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
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Ignition ON, observe the scan tool ECM Hood Position parameter. With the hood open, the Hood Position parameter should be Open. With the hood
closed, the Hood Position parameter should be Closed.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the B55 hood ajar switch.
2. Ignition OFF, test for less than 5 ohm between the ground circuit terminal C and ground.
‹› If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify DTC P257F is set as current.
‹› If the DTC is not set, test the signal circuit for a short to ground. If the circuit tests normal, replace the hybrid powertrain control module 2.
4. Install a 5 A fused jumper wire between the signal circuit terminal A and ground. Verify DTC P257E is set as current.
‹› If the DTC is not set, test the signal circuit for a short to voltage or open/high resistance. If the circuit tests normal, replace the hybrid
powertrain control module 2.
5. If all circuits test normal, test or replace the B55 hood ajar switch.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
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Hood Primary and Secondary Latch Replacement (See: Body and Frame/Doors, Hood and Trunk/Hood/Hood Latch/Service and Repair)
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Control Module References for hybrid powertrain control module 2 replacement, programming and setup
P257E
DTC P257D-P257F
Diagnostic Instructions
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Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
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Review Strategy Based Diagnosis for an overview of the diagnostic approach.
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Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC P257D