8 | April 2016
GMC
WATER AND DEF IN DURAMAX
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, con-
tamination may be found. Shown here are
examples of contamination. The cure: clean
and fush.
Audi
AUDI TPMS GLITCH
This bulletin applies to 2010 Audi Q5, A4,
A5 and A5 Cabriolet models. A 44 display in
the dash "TPMS tire pressure system mal-
function" may appear. DTC 03543 will likely
be stored (low availability) in the ABS/ESP
address word 03 (J104).
A software concern causes the low avail-
ability counter to reach the threshold for
DTC 03543 too quickly.
Integrated in the TPMS control is a coun-
ter that tracks system unavailability due to
Technical Service Bulletins
The fuel pressure regulator is contaminated
with DEF (diesel exhaust fuid).
Another look — fuel pressure regulator 1 is
contaminated with DEF.
Fuel pressure regulator 1 with rust due to
water contamination.
Continued on page 14...
Fuel pressure regulator 2 with rust (left) due
to water contamination.
Shown here is fuel pressure regulator 2 ex-
hibiting DEF contamination.