P1277 Cylinder #7 High To Low Side Open

Possible causes
  • Fuel injector No. 7 output circuit short to voltage.
  • Injector.
  • NG Module.
    • Symptoms
    – Engine Light ON (or Service Engine Soon Warning Light)
    P1277 Description
    Indicates a high voltage condition exists at the injector output of the NG module for cylinder No. 7 when low voltage is expected.
    P1277 Information for specific makes
    P1277 BUICK
    P1277 CADILLAC
    P1277 CHEVROLET
    P1277 DODGE
    P1277 FORD
    P1277 GMC