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Cadillac Leaves Light On

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X2 connector in the under hood fuse block.

Some owners of 2015-2019 Cadillac Escalade vehicles equipped with a 6.2L engine may comment about a Service Engine Soon light on. DTC P0300 may be set and/or a rough running engine concern may be present.

If SI diagnostics have been completed with no trouble found, inspect for a possible terminal tension concern on the ignition coil power feed for a possible cause of the DTC and/or a rough running engine. Also, check the X2 connector of the UBEC (underhood fuse block) for an intermittent SES traction control lamp concern and repair as necessary.

Check the connector for terminal spread (no tension).

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