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Home >> Cadillac >> 1997 >> Seville SLS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 4.6L >> Diagnostic Trouble Codes >> DTC P1258 - Engine Over-Temperature Protection >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK. See the BASIC TESTING article. After performing OBD system check, go to next step.
  2. Using scan tool, check if DTC P0108 or P1114 is set. If any of these DTC(s) are present, diagnose affected DTC(s). If DTC(s) are not present, diagnose cooling system.
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