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Sedans Pontiac Bonneville Pontiac Bonneville General Maintenance and Repair
2228 messages, Last post on Nov 29, 2009 at 4:40 PM
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This TSB from GM might apply. It addresses problems with the pressure control solenoid in the transaxle: Slips, Harsh Upshift or Garage Shifts, Launch Shudders, Flares, Erratic Shifts and Intermittent Concerns, DTC P1811 or P0748 Set (Replace Pressure Control Solenoid Valve Assembly) #00-07-30-002B - (Jul 19, 2002) 1997-1999 Buick Riviera 1997-2002 Buick Park Avenue 1998-2002 Buick LeSabre 1999-2002 Buick Regal 2000-2002 Buick Century 2002 Buick Rendezvous 1997-2001 Chevrolet Lumina 1997-2002 Chevrolet Monte Carlo 1999-2002 Chevrolet Venture 2000-2002 Chevrolet Impala 1997- 1999 Oldsmobile Eighty Eight 1997-2002 Oldsmobile Silhouette 1998-2002 Oldsmobile Intrigue 2001-2002 Oldsmobile Aurora (3.5L) 1997-2002 Pontiac Bonneville, Grand Prix 1999-2002 Pontiac Transport/Montana 2001-2002 Pontiac Aztek with Hydra-Matic 4T65-E (RPOs MN3, MN7, M15, M76) This bulletin is being revised to add additional models and model years. Please discard Corporate Bulletin Number 00-07-30-002A (Section --Automatic Transmission). Condition Some owners of the above vehicles with a Hydra-Matic 4T65-E transaxle may comment on harsh upshifts or harsh garage shifts, soft shifts, shudders on hard acceleration, or shifts erratic. These conditions may appear intermittently or set a DTC P1811 or P0748. During diagnosis, a low or high line pressure (actual versus desired) may be observed. Cause The above condition may be due to any one of the following which may affect line pressure output: Sediment inside the pressure control (PC) solenoid valve, causing the PC solenoid valve to mechanically bind. Sediment in the valve body, causing the torque signal regulator valve to stick. Incorrect transaxle oil level. Correction Important Any of the above conditions may be intermittent, therefore, this test should be performed at least three times. Refer to the Line Pressure Check Procedure in SI, along with the Line Pressure Specification Table below, to determine if actual versus desired pressures are within the values specified. The Scan Tool is only able to control the PC solenoid valve in PARK and NEUTRAL with the vehicle stopped. This protects the clutches from extremely high or low pressures in DRIVE or REVERSE ranges. Yadda, yadda, yadda........
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| Probably the sending unit but could also be a wiring or instrument panel cluster problem. Step #1 in the factory manual diagnostic routine is to verify operation of the instrument cluster. A Tech2 scan tool (GM dealer) is required to diagnose it properly. | |
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I have a 96 Bonnie with 108,000 miles on it and im having a cooling problem. The A/C does not blow hard or cold it starts to work better when Im on the freeway. so city driving it it not very cool the thermostat is on 60 and the fan is on high but its barley blowing any air. Its electroinc controled. I hear something like a vacumm leak from the pass sid footwell. Ive spent quite a bit of money on the A/C it has been fully charged anf the controller is brand new. Whats next! |
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Replying to: alcan (Jul 21, 2004 1:34 am) |
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It's one of the six solenoids attached to the valve body, under the end cover of the transaxle.
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Replying to: alcan (Jul 25, 2004 10:23 pm) it has been fully charged anf the controller is brand new. Whats next! Update I took it to my local AC shop they are telling me the compressor, accumlator and the expansion valve need to be replaced. Does this sound correct the quote for the work 900-1100 bucks.
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| If the compressor has failed, then the quote is about right. Reman compressors usually come with the warning that the compressor is not covered by warranty unless the accumulator/dryer is also changed. Also, debris from the compressor gets into the system and requires a system flush and expansion valve replacement. | |
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Replying to: henryl (Jul 27, 2004 7:57 am) |
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You may have a system comparable to my LeSabre. I had a slow movement of the various vacuum motors that pull the vanes inside the box that directs all the air under the dash. If you hear a vacuum leak under the right side, that could be the reason there not much happening. The vacuum line comes in at the right side from the passenger compartment. Then it goes to a switching device that's electrically controlled on the automatic air system. From there hoses come out to 5 or 6 vacuum motors that pull the vanes. Any of those vacuum lines could be damaged. You have to take off 3 or 4 little screws under the dash above the passenger's feet to get up under there. Then you need to take off four or 5 screws that hold the glovebox up. You need to be able to see through that opening to see the vacuum lines coming in. I have a service manual so it's not as intimidating as it sounds to me. I moved around the vacuum lines and tried to disconnect the main one. The system started working better, so one of those lines wasn't connected well or something. The dealer had been into that area with a fan motor controller problem a couple years ago and the air never seemed to blow out as well after that. IF you have no vacuum to the controller box under there, the air should be coming out the defrost vents. That's what the system does when there's no vacuum to control it. Try feeling up there to see if you're getting air when you first start the car. Then see if it tries to move the air to other output after a minute or more of running the motor.
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Replying to: imidazol97 (Aug 01, 2004 11:16 am) |
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