This bulletin applies to 2010-2014 GMC Savana and Sierra models equipped with the 6.6L Duramax diesel engine. The vehicle may experience a hard start, no-start, rough running and low fuel pressure and/or DTCs P0087, P0088, P0191 and P128E.

During inspection of the fuel system, contamination may be found. Shown here are examples of contamination.

The cure: clean and flush.

Fuel pressure regulator contaminated with DEF (diesel exhaust fluid).

Fuel pressure regulator contaminated with DEF (diesel exhaust fluid).

Fuel pressure regulator 1 contaminated with DEF.

Fuel pressure regulator 1 contaminated with DEF.

Fuel pressure regulator 1 with rust due to water contamination.

Fuel pressure regulator 1 with rust due to water contamination.

Fuel pressure regulator 2 with rust (left) due to water contamination.

Fuel pressure regulator 2 with rust (left) due to water contamination.

Fuel pressure regulator 2 with DEF contamination.

Fuel pressure regulator 2 with DEF contamination.

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