GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1999 🢒 Safari - 2WD 🢒 Body and Accessories 🢒 Data Link Communications 🢒 DTC C0559 EEPROM Checksum Error

Object Number: 381483 Size: LF
Theft Deterrent System Components
Theft Deterrent System Schematics
Theft Deterrent System Schematic Icons
Theft Deterrent System Schematic Icons

Circuit Description

This DTC indicates a Passlock 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 module is not replaceable. If DTC C0559 is set, the Passlock 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 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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