GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2009 🢒 Chevy Suburban - 4WD 🢒 DTC 🢒 DTC P1AFB or P1B01

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 P1AFB: Drive Motor 1 Control Module Programmable Logic Device Security Code

DTC P1B01: Drive Motor 2 Control Module Programmable Logic Device Security Code

Circuit/System Description

This diagnostic applies to internal microprocessor integrity conditions within the hybrid powertrain control module (HPCM). The HPCM and each Motor Control Module (MCM) utilize a programmable logic device (PLD) to perform certain input and output functions. MCM 1 programs the PLD with software at every ignition ON event. MCM 1 and 2 verify that the PLD is programmed successfully.

Conditions for Running the DTC
    • The ignition is in RUN or CRANK.
    • Ignition voltage is 8-18 volts.

Conditions for Setting the DTC

The control module has detected an internal PLD malfunction.

Action Taken When the DTC Sets
    • DTCs P1AFB and P1B01 are Type A DTCs.
    • The HPCM commands the battery energy control module (BECM) to open the high voltage contactor relays.

Conditions for Clearing the DTC

DTCs P1AFB and P1B01 are Type A DTCs.

Diagnostic Aids

An intermittent loss of battery power to the drive motor generator power inverter module assembly (PIM) may set this DTC.

Reference Information

Connector End View Reference

Component Connector End Views

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Circuit/System Verification
  1. Clear the DTC information.
  2. Turn the ignition OFF for 1 minute.
  3. Turn the ignition ON.
  4. Retest for DTC P1AFB or P1B01.

Circuit/System Testing
  1. Ignition OFF.
  2. Wait 2 minutes.
  3. Disconnect PIM connector X1.
  4. Ignition OFF.
  5. Wait 2 minutes.
  6. Reconnect PIM connector X1.
  7. Ignition ON, retest for DTC P1AFB or P1B01.
    8. ⇒If the DTC resets, program the PIM with the latest software version and recheck for DTCs. If the DTC resets after programming or if the PIM already contains the latest software version, replace the PIM.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for PIM replacement, setup, and programming.