Confirm my bad news... Tranny Problem
11-20-2009, 09:18 PM
#1
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Confirm my bad news... Tranny Problem 05' GXP - 51k miles
I am getting that shudder' that I have read in a few old posts...
Car shifts fine. No slipping in or out of gears.
This shudder (almost like a hesitation) is really noticable when cruising on the highway with the cruise control on. It occurs when you give the car just a slight push on the throttle (when trying to maintain cruising speeds)
It seems to happen when ever I am soft on the throttle. However, I never notice this problem under heavier acceleration.
Is this a line pressure issue? Valve body?
Or possibly that TCC problem I saw listed on the old 'service announcemnt'?
I drive 130mi. a day, all highway. Is the tranny destined to fail, or should I try replacing cheaper parts first?
I am getting that shudder' that I have read in a few old posts...
Car shifts fine. No slipping in or out of gears.
This shudder (almost like a hesitation) is really noticable when cruising on the highway with the cruise control on. It occurs when you give the car just a slight push on the throttle (when trying to maintain cruising speeds)
It seems to happen when ever I am soft on the throttle. However, I never notice this problem under heavier acceleration.
Is this a line pressure issue? Valve body?
Or possibly that TCC problem I saw listed on the old 'service announcemnt'?
I drive 130mi. a day, all highway. Is the tranny destined to fail, or should I try replacing cheaper parts first?
11-20-2009, 09:59 PM
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exactly.... it's really noticable when "feathering" the throttle....
Say my cruise is set at 70mph... and it drops to 69mph on a slight little hill... that little bit of throttle to get it back to 70mph is where this thing starts to shudder.
Same when cruising on back roads at 55mph. Just the slightest nudge on the throttle to maintain a constant speed causes this reaction.
It's weird. Having experienced other tranny failures in other cars, this is weird. Shifts perfectly into Drive, Reverse. No clunky shifts. No gears banging. Tap shift works fine.
The tranny is smooth under heavy load.
But not when trying to baby the throttle.
I have NOT noticed the tach/RPM revving (like gear searching/slipping)...
Does the TCC issue throw a code?
Engine light came on today. I had the tranny fluid changed about 20k miles ago. I think they flushed the tranny too.
Say my cruise is set at 70mph... and it drops to 69mph on a slight little hill... that little bit of throttle to get it back to 70mph is where this thing starts to shudder.
Same when cruising on back roads at 55mph. Just the slightest nudge on the throttle to maintain a constant speed causes this reaction.
It's weird. Having experienced other tranny failures in other cars, this is weird. Shifts perfectly into Drive, Reverse. No clunky shifts. No gears banging. Tap shift works fine.
The tranny is smooth under heavy load.
But not when trying to baby the throttle.
I have NOT noticed the tach/RPM revving (like gear searching/slipping)...
Does the TCC issue throw a code?
Engine light came on today. I had the tranny fluid changed about 20k miles ago. I think they flushed the tranny too.
11-20-2009, 10:03 PM
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What is the fix for the TCC... if that's what this problem turn out to be?
I see valve body kits for about $350 plus labor....
I saw some nice tranny/vavle body upgrades at that Raptor site...
I see valve body kits for about $350 plus labor....
I saw some nice tranny/vavle body upgrades at that Raptor site...
11-21-2009, 08:13 AM
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same issue with mine. I am replacing my valve body today. i will let you know if that fixes it. from talking to my cousin, who is a master Gm tech. thats what he thinks it is
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11-21-2009, 09:45 AM
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A shudder usually indicates slipping clutches.
Tater,
Sounds like your TCC is slipping or its a DOD problem. Only way to tell is to have a Tech 2 on it to verify TCC slip speed and to command on the DOD and drive it around. You really don't want to spend the money on guessing what will fix it. It may be wise to take it to a GM dealer and at least pay for them to diagnose it unless you have access to a Tech 2 and can perform the tests I'm talking about.
Tater,
Sounds like your TCC is slipping or its a DOD problem. Only way to tell is to have a Tech 2 on it to verify TCC slip speed and to command on the DOD and drive it around. You really don't want to spend the money on guessing what will fix it. It may be wise to take it to a GM dealer and at least pay for them to diagnose it unless you have access to a Tech 2 and can perform the tests I'm talking about.
11-21-2009, 11:25 AM
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^^^
At first I was also thinking it was an issue with the DOD engaging and disengaging...
Does the DOD affect torque converter lock-up?
Would driving the car in Manual mode disengage the the torque converter?
I will be taking it in to a GM dealer next week...
But I will be curious what you guys find out also. Maybe you can give me a 'heads-up' before my appointment....
At first I was also thinking it was an issue with the DOD engaging and disengaging...
Does the DOD affect torque converter lock-up?
Would driving the car in Manual mode disengage the the torque converter?
I will be taking it in to a GM dealer next week...
But I will be curious what you guys find out also. Maybe you can give me a 'heads-up' before my appointment....
11-21-2009, 12:28 PM
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^^^
At first I was also thinking it was an issue with the DOD engaging and disengaging...
Does the DOD affect torque converter lock-up?
Would driving the car in Manual mode disengage the the torque converter?
I will be taking it in to a GM dealer next week...
But I will be curious what you guys find out also. Maybe you can give me a 'heads-up' before my appointment....
At first I was also thinking it was an issue with the DOD engaging and disengaging...
Does the DOD affect torque converter lock-up?
Would driving the car in Manual mode disengage the the torque converter?
I will be taking it in to a GM dealer next week...
But I will be curious what you guys find out also. Maybe you can give me a 'heads-up' before my appointment....
11-21-2009, 06:59 PM
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Listed below are the powertrain conditions that will inhibit V4 mode, while operating under light load driving conditions:
• Engine manifold vacuum low
• Brake booster vacuum pressure low
• Accelerator pedal position rate of increase too high, electronic throttle control
• Accelerator pedal position too high, electronic throttle control
• Ignition voltage out of range
• Engine oil pressure out of range
• Engine oil temperature out of range
• Engine RPM out of range
• Transmission gear incorrect
• Transmission range incorrect
• Transmission gear shift in progress
• All cylinders activated via scan tool output control
• Minimum time in V8 mode not met
• Maximum V4 mode time exceeded
• Engine oil aeration present
• Decel fuel cutoff active
• Fuel shut-off timer active
• Minimum heater temp low, HVAC system
• Reduced engine power active, electronic throttle control
• Brake torque management active
• Axle torque limiting active
• Engine metal over temperature protection active
• Catalytic converter over temperature protection active
• Piston protection active, knock detected
• Hot coolant mode active
• Engine over speed protection active
• Fault Active or Fault Pending--displacement on demand (DoD) is disabled for the following faults:
- Manifold Absolute Pressure Sensor
- Brake Booster Vacuum Sensor
- Engine Oil Pressure Sensor
- Engine Coolant Temperature Sensor
- Vehicle Speed Sensor
- Crankshaft Position Sensor
- Engine Misfire Detected
- Displacement On Demand Solenoid Driver Circuit
• Engine manifold vacuum low
• Brake booster vacuum pressure low
• Accelerator pedal position rate of increase too high, electronic throttle control
• Accelerator pedal position too high, electronic throttle control
• Ignition voltage out of range
• Engine oil pressure out of range
• Engine oil temperature out of range
• Engine RPM out of range
• Transmission gear incorrect
• Transmission range incorrect
• Transmission gear shift in progress
• All cylinders activated via scan tool output control
• Minimum time in V8 mode not met
• Maximum V4 mode time exceeded
• Engine oil aeration present
• Decel fuel cutoff active
• Fuel shut-off timer active
• Minimum heater temp low, HVAC system
• Reduced engine power active, electronic throttle control
• Brake torque management active
• Axle torque limiting active
• Engine metal over temperature protection active
• Catalytic converter over temperature protection active
• Piston protection active, knock detected
• Hot coolant mode active
• Engine over speed protection active
• Fault Active or Fault Pending--displacement on demand (DoD) is disabled for the following faults:
- Manifold Absolute Pressure Sensor
- Brake Booster Vacuum Sensor
- Engine Oil Pressure Sensor
- Engine Coolant Temperature Sensor
- Vehicle Speed Sensor
- Crankshaft Position Sensor
- Engine Misfire Detected
- Displacement On Demand Solenoid Driver Circuit
This transmission is equipped with an electronically controlled capacity clutch (ECCC). The pressure plate does not fully lock to the torque converter cover. Instead, the pressure plate maintains a small amount of slippage, about 20 RPM, in SECOND, THIRD and FOURTH gears, depending on the vehicle application. ECCC was developed to reduce the possibility of noise, vibration or chuggle caused by TCC apply. Typical apply speeds are 49-52 km/h (30-32 mph) in THIRD gear and 65-73 km/h (40-45 mph) in FOURTH gear. Full lockup is available at highway speeds on some applications.
11-23-2009, 04:11 PM
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Thanks for all the good info....
I am stopping by AutoZone on Tuesday... engine light is now on.
I'm not sure yet if the tranny threw the code or if it's that same code it threw before for some bogus erroneous Emissions control.
I'm asking Santa this year that it is only an electrical problem...
I am stopping by AutoZone on Tuesday... engine light is now on.
I'm not sure yet if the tranny threw the code or if it's that same code it threw before for some bogus erroneous Emissions control.
I'm asking Santa this year that it is only an electrical problem...
11-23-2009, 08:39 PM
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BTW I don't think the check engine light will turn on for transmission issues.....I could be mistaken. Plus your average scantool will not read transmission codes.
Last edited by Count of Monte Carlo; 11-23-2009 at 09:11 PM.
11-24-2009, 07:04 PM
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Thanks for all the good info....
I am stopping by AutoZone on Tuesday... engine light is now on.
I'm not sure yet if the tranny threw the code or if it's that same code it threw before for some bogus erroneous Emissions control.
I'm asking Santa this year that it is only an electrical problem...
I am stopping by AutoZone on Tuesday... engine light is now on.
I'm not sure yet if the tranny threw the code or if it's that same code it threw before for some bogus erroneous Emissions control.
I'm asking Santa this year that it is only an electrical problem...
Regarding my transmission woes, if it can hold off until maybe February, I might take it to a tranny shop and ask them to diagnose and repair before it goes completely to ****. Bad enough that I gotta replace the water pump, plus diagnose a bad hub and do brakes again, after investing another 500 in tires. Sucks bein' poor.
11-24-2009, 07:58 PM
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What temps are you getting? It may be a bum t. conv. too.
I hear ya about being poor... I wish the header thing was done after Christmas. Can't do that and buy for the kids at the same time.
All I want to know is where is our stimulus out of Obama's secret stash?....(sarcastic...) Everyday there is something else to shake your head about from that administration...
-Mike
I hear ya about being poor... I wish the header thing was done after Christmas. Can't do that and buy for the kids at the same time.
All I want to know is where is our stimulus out of Obama's secret stash?....(sarcastic...) Everyday there is something else to shake your head about from that administration...
-Mike
11-24-2009, 09:22 PM
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I had a p0455 for over a year and finally spent the $30 and 5 minutes to swap out the EVAP part back near the filler neck. It kills me that I waited so long for such an easy repair.
Regarding my transmission woes, if it can hold off until maybe February, I might take it to a tranny shop and ask them to diagnose and repair before it goes completely to ****. Bad enough that I gotta replace the water pump, plus diagnose a bad hub and do brakes again, after investing another 500 in tires. Sucks bein' poor.
Regarding my transmission woes, if it can hold off until maybe February, I might take it to a tranny shop and ask them to diagnose and repair before it goes completely to ****. Bad enough that I gotta replace the water pump, plus diagnose a bad hub and do brakes again, after investing another 500 in tires. Sucks bein' poor.
Then the warpped rotors.... And the terrible Goodyear Eagles.... and all 4 tires wearing on th inside (can't seem to get a shop to fix it either with an alignment)....
Errr.... like others have said... I really want to love this ride.... BUT!!!
My tranny temps have never exceeded 210 deg., that was on the hottest day this summer. And I randomly check it for shitz -n- gigglez.... typically it runs 178-195 deg.
I used manual mode sparingly.
Did I read an older thread correctly stating not to down shift in Manual Mode????
In manual mode, I only seem to feel a slight shudder in 3rd and 4th not 1st and 2nd....
I'm still stuck travling. Can't get to a scan tool until Black Friday....
And yes, I was throwing a EVAP code but the garage said Pontiac had a service bulletin with no fix stated for my code...??? really?
Last edited by Tater_Salad; 11-24-2009 at 09:30 PM.
