P164B

DTC P164B or P164C

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.

DTC Descriptor
DTC P164B
- Fuel Pump Driver Control Module Read Only Memory (ROM)

DTC P164C
- Fuel Pump Driver Control Module Random Access Memory (RAM)

Circuit/System Description

The control module runs a program to detect an internal fault when power up is commanded.

Conditions for Running the DTC

Ignition ON.

Conditions for Setting the DTC

The FPCM relay has detected an internal malfunction.

Action Taken When the DTC Sets

The module may have limited functional operation depending on the severity of the calibration corruption.

Conditions for Clearing the DTC

* A DTC clears when the malfunction is no longer present.
* A history DTC clears when the module ignition cycle counter reaches the reset threshold, without a repeat of the malfunction.

Reference Information
Schematic Reference

Engine Controls Schematics (LS3) (Electrical Diagrams)Engine Controls Schematics (LS7) (Electrical Diagrams)Engine Controls Schematics (LS9) (Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Fuel System Description (W/LS9) (Description and Operation)Fuel System Description (W/LS3 or LS7) (Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information

Circuit/System Verification

Verify that DTC P164B or DTC P164C is not set.

If the DTC is set, replace the fuel pump control module relay.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

Fuel Pump Flow Control Module Relay Replacement (Service and Repair)