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2002 Pontiac Grand Prix gt

Tiny
JOHNN B
  • MEMBER
  • 2002 PONTIAC GRAND PRIX
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 106,000 MILES
I replaced ignition control module and spark plugs on my 2002 pontiac grand prix gt, now I have 3 engine codes, p0128, p0300, p0420, what could be causing this, and how do I reset computer
Thursday, December 23rd, 2010 AT 9:57 PM

1 Reply

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
P0128 has to do with coolant temp sensor.
P0300 is random mis-fire code.
P0420 is the evap system.

Did you have these codes before you did the work? Use a scanner to erase codes. If you take the negative battery cable loose, it can cause other issues, security system--radio-- driveability issues, just to name a few.
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Thursday, March 3rd, 2011 AT 9:43 PM

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