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2005 Pontiac Grand Prix GTP 3.8L Misfire, MIL Lamp on
Posted to GM Driveability on 10/17/2013 9 Replies

This one is killing me. First are the known issues. The exhaust crossover is cracked, the boost control solenoid is bad. When started cold it runs fine. About a minute after entering closed loop cyls 1 and 3 begin to misfire. Engine is shaking and CKP relearn ...

Summary posted 11/1/2013

9 Replies Received (View Replies)

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car Vehicle Data

2005 Pontiac Grand Prix GTP

VIN 2G2WR52445
Engine3.8 L / 6 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFuel Injection / mpfi
EmissionsOBD-II Compliant
SymptomsMisfire, MIL Lamp On
OccursIdle, Warm
Misc.Misfires When Warm

Trouble Codes

P0243Turbocharger Wastegate Control Solenoid Valve Circuit Malfunction
P0300Multiple Misfire Detected