Problem: The truck came to the shop because
it was hesitating, stumbling and bogging on acceleration. The MIL
was on and the vehicle was in “Reduced Power” mode.
Details: The technician connected a scan
tool and noted six DTCs: P063D, P0933, P0863, P2121, P2267 and
P2299. All the codes had two things in common – all were related
to particulate and soot filter pressure sensors underneath the
truck and they were all linked to a 5-volt reference being
shorted. Coincidently, the customer had been working under the
truck, changing those filters prior to the problem starting. The
technician inspected the harness going to those sensors.
Confirmed Repair: The technician found the
wire harness draped over the exhaust pipe and the driveline. The
Yellow/Pink 5-volt reference wire had been rubbed through and was
shorting. The technician repaired the wire, routed the harness
properly and cleared the DTCs. Problem fixed!