2005 Pontiac Grand Prix Logo
Lorie Orlikowski
Lorie Orlikowski Posted on Nov 27, 2010
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Our 2005 Pontiac Grand Prix is hard shifting. The diag codes that came up are trans codes P1811c and P1819c. Does anyone know what these codes mean? I'm having an impossible time finding them. Thanks in advance!

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The codes mean that the Electronic Pressure Control Solenoid is going bad. The computer detects that the shifts are taking longer than 0.65 seconds. Then the computer commands maximum line pressure to avoid burning out the clutches, hence the hard shifting. My 2002 Grand Prix had the same problem, and I had great luck just installing a shift kit to speed up the shifting and haven't had any further issues.

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