GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 1995 🢒 Sunfire 🢒 DTC 🢒 DTC P0602 Control Module Not Programmed

Circuit Description

DTC P0602 is a PCM programming error. If DTC P0602 sets attempt to reprogram the vehicle three times using the latest Techline procedure.

Action Taken When the DTC Sets

The vehicle will not start.

Conditions for Clearing the MIL/DTC

DTC P0602 will clear when the PCM is reprogrammed.

Step

Action

Values

Yes

No

1

Was the On-Board Diagnostic (OBD) System Check performed?

--

Go to Step 2

Go to Powertrain On Board Diagnostic (OBD) System Check

2
  1. Reprogram the PCM.
  2. If the DTC resets try to reprogram again, three times total.

Does DTC P0602 reset?

--

Go to Step 3

Go to Powertrain On Board Diagnostic (OBD) System Check

3

Replace the PCM.

Is the action complete?

--

Go to Powertrain On Board Diagnostic (OBD) System Check

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