DTCs and Hard shifting
#1
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DTCs and Hard shifting
about 7 or 8 months ago i left my house and while driving to work i noticed that my car was shifting very hard, when i go from 1st to second it feels like someone rear ended me, it happened for a bit and 20 minutes later when i took my car to GM, i shut it off, and when i started it again it was all history and wouldnt happen again
today, i left work for a bit, and when i hit the road, same problem, very hard shifting
i had a SES light on for a week or so but the car was very normal to drive, i never had the chance to scan it, so i just came home and scanned it and the following showed up
[PCM] P0442 - Evaporative Emission (EVAP) System Small Leak Detected (SES) (Old) (History) (Current) (Immature)
[PCM] P0502 - Vehicle Speed Sensor (VSS) Circuit Low Input (Old) (Immature)
[Brake] C1226 - RF Excessive Wheel Speed Variation (History)
[Unknown] P1540 - Air Conditioning (A/C) Refrigerant Overpressure - Air Conditioning (A/C) Disabled (History) (Immature)
[Entertainment] B1004 - Keep Alive Memory (KAM) (History) (Immature)
[Entertainment] B1327 - Device Power Circuit Low (History) (Immature)
[Entertainment] U1255 - Class 2 Communication Malfunction (History) (Current) (Immature)
[Personal Comm.] B2470 - Daytime Running Lamps Fault (History) (Immature)
anything might be related? i doubt it
i shut the car off at a red light, back on right away, problem stayed
i shut the car off for 10 minutes when i got home, started it back again, shes back to normal
any ideas?
today, i left work for a bit, and when i hit the road, same problem, very hard shifting
i had a SES light on for a week or so but the car was very normal to drive, i never had the chance to scan it, so i just came home and scanned it and the following showed up
[PCM] P0442 - Evaporative Emission (EVAP) System Small Leak Detected (SES) (Old) (History) (Current) (Immature)
[PCM] P0502 - Vehicle Speed Sensor (VSS) Circuit Low Input (Old) (Immature)
[Brake] C1226 - RF Excessive Wheel Speed Variation (History)
[Unknown] P1540 - Air Conditioning (A/C) Refrigerant Overpressure - Air Conditioning (A/C) Disabled (History) (Immature)
[Entertainment] B1004 - Keep Alive Memory (KAM) (History) (Immature)
[Entertainment] B1327 - Device Power Circuit Low (History) (Immature)
[Entertainment] U1255 - Class 2 Communication Malfunction (History) (Current) (Immature)
[Personal Comm.] B2470 - Daytime Running Lamps Fault (History) (Immature)
anything might be related? i doubt it
i shut the car off at a red light, back on right away, problem stayed
i shut the car off for 10 minutes when i got home, started it back again, shes back to normal
any ideas?
#2
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Hmm, with all those unrelated codes it makes me think there'* a problem with corrosion. Is there a chance things got really wet? Remove the plugs on the PCM and check them for any kind of build up. Clean and reconnect.
The WSS and VSS are very close to each other. Check and clean them as well. Almost seems like you drove threw a deep puddle.
The WSS and VSS are very close to each other. Check and clean them as well. Almost seems like you drove threw a deep puddle.
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[Entertainment] B1004 - Keep Alive Memory (KAM) (History) (Immature)
[Entertainment] B1327 - Device Power Circuit Low (History) (Immature)
[Entertainment] U1255 - Class 2 Communication Malfunction (History) (Current) (Immature)
[Personal Comm.] B2470 - Daytime Running Lamps Fault (History) (Immature)
ever since i replaced my HU the above doesnt clear for some reason
i guess its related to it
i tried installing the factory HU back then, it cleared IIRC
[Entertainment] B1327 - Device Power Circuit Low (History) (Immature)
[Entertainment] U1255 - Class 2 Communication Malfunction (History) (Current) (Immature)
[Personal Comm.] B2470 - Daytime Running Lamps Fault (History) (Immature)
ever since i replaced my HU the above doesnt clear for some reason
i guess its related to it
i tried installing the factory HU back then, it cleared IIRC
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[Entertainment] B1004 - Keep Alive Memory (KAM) (History) (Immature)
[Entertainment] B1327 - Device Power Circuit Low (History) (Immature)
[Entertainment] U1255 - Class 2 Communication Malfunction (History) (Current) (Immature)
[Personal Comm.] B2470 - Daytime Running Lamps Fault (History) (Immature)
ever since i replaced my HU the above doesnt clear for some reason
i guess its related to it
i tried installing the factory HU back then, it cleared IIRC
[Entertainment] B1327 - Device Power Circuit Low (History) (Immature)
[Entertainment] U1255 - Class 2 Communication Malfunction (History) (Current) (Immature)
[Personal Comm.] B2470 - Daytime Running Lamps Fault (History) (Immature)
ever since i replaced my HU the above doesnt clear for some reason
i guess its related to it
i tried installing the factory HU back then, it cleared IIRC
My buddys Deville is having the same stupid issues.
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and the HU been in the car for over a year or so now, i doubt its part of the problem
well, i hope not lol
1st time this happened to me months and months 1st thing i did was check the fluid, and again, it wasnt low or overfilled
shifting was horrible throughout the entire RPM range, even shifting at 2500 or 3000RPM you can feel the kick for sure. and when you hit 6 or 7k RPM, its alot worse dh2dh2
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any better way of wiring it? lol
and the HU been in the car for over a year or so now, i doubt its part of the problem
well, i hope not lol
last time i check the fluid was over a month or so ago, and it was perfect, as for leaks i dont notice any.
1st time this happened to me months and months 1st thing i did was check the fluid, and again, it wasnt low or overfilled
shifting was horrible throughout the entire RPM range, even shifting at 2500 or 3000RPM you can feel the kick for sure. and when you hit 6 or 7k RPM, its alot worse dh2dh2
and the HU been in the car for over a year or so now, i doubt its part of the problem
well, i hope not lol
last time i check the fluid was over a month or so ago, and it was perfect, as for leaks i dont notice any.
1st time this happened to me months and months 1st thing i did was check the fluid, and again, it wasnt low or overfilled
shifting was horrible throughout the entire RPM range, even shifting at 2500 or 3000RPM you can feel the kick for sure. and when you hit 6 or 7k RPM, its alot worse dh2dh2
try a flush and filter, or at least get in there and check things out
#10
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theres no point in checking it out here, they will tell me "we can not duplicated the problem at the time being" and charge me $195.00 an hour for labour
yes its $195.00 an hour at GM in Fort Crap