GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1998 🢒 Safari - 4WD 🢒 Body and Accessories 🢒 Wiring Systems 🢒 DTC C0559 EEPROM Checksum Error

Object Number: 500721 Size: LF
Theft Deterrent System Components
Theft Deterrent System Schematics
Steering Assist Schematics
Theft Deterrent System Schematic Icons
Theft Deterrent System Schematic Icons

Circuit Description

This DTC indicates a Passlock/EVO module internal memory failure.

Conditions for Setting the DTC

All of the following conditions must be met:

    • The ignition switch is ON.
    • An internal error detection diagnostic found a failure in the module memory.

Diagnostic Aids

The memory portion of the Passlock/EVO module is not replaceable. If DTC C0559 is set, the Passlock/EVO module must be replaced.

Step

Action

Value(s)

Yes

No

1

Did you perform the VTD diagnostic system check?

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Go to Step 2

Go to Diagnostic System Check - Theft Deterrent

2
  1. Turn the ignition switch to the OFF position.
  2. Replace the Passlock/EVO module. Refer to Theft Deterrent Module Replacement .

Is the repair complete?

--

Go to Step 3

--

3
  1. Reconnect all previously disconnected connectors and components.
  2. Turn the ignition switch ON.
  3. Connect the scan tool.
  4. Clear the DTCs.
  5. Perform 1 of the following Passlock reprogramming procedures:

Is the repair complete?

--

Go to Diagnostic System Check - Theft Deterrent

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