P1277 GMC Cylinder #7 High To Low Side Open

P1277 GMC 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 GMC Description

    Indicates a high voltage condition exists at the injector output of the NG module for cylinder No. 7 when low voltage is expected.

    GMC Vehicle:GMC Acadia,GMC Canyon,GMC Envoy,GMC Savana 1500,GMC Savana 2500,GMC Savana 3500,GMC Sierra 1500,GMC Sierra 2500 HD,GMC Sierra 3500 HD,GMC Terrain,GMC Yukon,GMC Yukon XL 1500,GMC Yukon XL 2500,
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