GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2008 🢒 Vibe - FWD 🢒 DTC 🢒 DTC P0601, P0602, P0603, P0604, P0605, P0606, P0607, P1600, P1621, P1627, P1680, P1681, P1683, or P2610

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 Descriptors

DTC P0601: Control Module Read Only Memory (ROM)

DTC P0604: Control Module Random Access Memory (RAM)

DTC P0606: Control Module Internal Performance

DTC P0607: Control Module Performance

DTC P2610: Control Module Ignition Off Timer Performance

Circuit/System Description

The powertrain control module (PCM) performs continuous self checks of all internal circuits. If the status of an internal memory circuit within the control module is incorrect, a DTC P0601 or P0604 sets. If the inputs or outputs from the 2 central processing units (CPU) within the control module deviate from the standard level, a DTC P0606 or P0607 sets. The control module has several internal clock or timer circuits. The DTC P2610 diagnostic monitors the internal timer circuit responsible for the ignition OFF operation of the evaporative emission (EVAP) system vacuum leak pump. If the there is an error in the control module timer, a DTC P2610 sets.

Conditions for Running the DTC

P0601, P0604, P0606, and P0607

    • The ignition is ON, or the control module is awake.
    • The DTCs run continuously once the above condition is met.

P2610

    • The engine has been running for greater than 10 minutes.
    • The DTC runs once an ignition cycle.

Conditions for Setting the DTC

P0601, P0604, P0606, and P0607

The PCM detects that an internal error exists.

P2610

The PCM engine running timer and the engine soak timer do not agree.

Action Taken When the DTC Sets
    • DTCs P0601, P0604, P0606, and P0607 are type A DTCs.
    • DTC P2610 is a type B DTC.

Conditions for Clearing the DTC
    • DTCs P0601, P0604, P0606, and P0607 are type A DTCs.
    • DTC P2610 is a type B DTC.

Diagnostic Aids
    • A low battery condition may cause DTC P2610 to set.
    • An intermittent condition at the ignition switch may cause DTC P2610 to set.

Reference Information

Schematic Reference

Engine Controls Schematics

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing
  1. Ignition ON, clear the DTC information with a scan tool. Observe the scan tool DTC information. Verify that DTC P0606 does not fail this ignition cycle.
    2. ⇒If DTC P0606 failed this ignition, test the PCM 5-volt reference circuit for a short to ground. If the circuits test normal, replace the PCM.
  2. Observe the DTC information with a scan tool. Verify DTCs P0601, P0604, P0607, or P2610 do not set this ignition cycle.
    3. ⇒If any of the DTCs set this ignition cycle, replace the PCM.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for control module replacement, setup, and programming