PRE-RELEASE
DTC P162B
| DTC P162B |
| 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.
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| DTC Descriptor |
DTC P162B
Remote Vehicle Speed Limiting Signal Message Counter Incorrect
| Circuit/System Description |
When a remote slow-down request is sent from OnStar, the vehicle communication interface module sends a serial data message to the engine control module (ECM) indicating that reduced vehicle speed has been requested. Once the request is active, the ECM begins reducing engine torque to match requested vehicle speed and the REDUCED ENGINE POWER message is displayed.
| Conditions for Running the DTC |
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The engine run time is greater than 5 seconds.
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A remote slow-down request is sent from OnStar
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| Conditions for Setting the DTC |
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The VIN embedded in the slow-down request does not match the VIN stored in the ECM.
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The rolling code counter embedded in the slow-down request does not increment for ten consecutive messages.
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| Action Taken When the DTC Sets |
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ECM ignores all reduced vehicle speed request messages from the vehicle communication interface module.
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The ECM stores DTC P162B in history.
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| Conditions for Clearing the DTC |
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The condition responsible for setting the DTC no longer exists.
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A history DTC will clear after 40 malfunction-free ignition cycles have occurred.
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| Reference Information |
Schematic Reference
OnStar Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Remote Vehicle Speed Limiting 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
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Scan Tool Reference
Control Module References for scan tool information
| Circuit/System Verification |
Perform the scan tool Stolen Vehicle Slow-Down Clear. Verify DTC P162B is not set.
| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the repair.
Control Module References for vehicle communication interface module and ECM replacement, setup, and programming
