Vehicle: 2001 Pontiac Grand
Prix, V6-3.8L, VIN K, Automatic Transmission/Transaxle
Problem: This vehicle came into the shop with
DTC P0404, which set right away after clearing. The customer
noticed the engine stumbled on mild acceleration.
Details: The EGR valve could be commanded open
with a scan tool. The engine only stumbled at idle when commanded
to 60 percent. The technician removed the EGR valve and inspected
all ports. All ports were clear. Scan tool PID information showed
that the EGR position voltage was only 1.75 volts when the valve
was commanded to the wide-open position. The voltage at the
sensor matched the scan tool data.
Confirmed Repair: The technician replaced the
EGR valve. Now the position voltage reached 4.25v at the
wide-open position. The DTC was cleared and the vehicle test
driven. The problem was resolved.