2002 pontiac grand prix gt

2002 PONTIAC GRAND PRIX
106,000 MILES • 6 CYL • FWD • AUTOMATIC
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JOHNN B
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  • 1 POST
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
Dec 23, 2010 at 9:57 PM
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JDL
  • ✓ASE Certified Mechanic
  • 16,098 POSTS
  • ASE Certified Mechanic
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.
Mar 3, 2011 at 9:43 PM
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