MODULE AR-CAB 5464394 - Caterpillar

Table 1
Diagnostic Trouble Codes for ECM Software    
CDL Code     Description     Notes    
253-2     Personality Module : Erratic, Intermittent, or Incorrect     The Electronic Control Module (ECM) detects incorrect engine software.
If equipped, the warning light will come on.
This diagnostic code is not logged.
Factory passwords are required to clear this diagnostic code.
The engine will not start.
The flash file in the ECM is from the wrong engine family.    Test Step 1. Correct the ConditionDetermine the diagnostic code that is active.Expected Result:A 253-2 diagnostic code is active.Results:
A 253-2 code is active - Repair: Obtain the engine serial number. Use SIS Web to determine the latest available flash file for the engine. Verify that the latest available flash file is loaded into the ECM.If necessary, use the electronic service tool to install the correct flash file into the ECM. Refer to the Troubleshooting Guide, "Flash Programming".STOP