2004 Chevy Impala Hard Shifts and trouble going into 1st fr

Tiny
BOGAN59
  • MEMBER
  • 2004 CHEVROLET IMPALA
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 126,000 MILES
Had problem before. Mechanics never showed error code problems. Drove for long time with problem. Eventually error codes showed up and had mulitple items replaced including: transmission, display panel, ignition switch, PCM control cluster. Even after all that with New transmission, intermittent shift problem is STILL THERE. Nobody can figure out what it is and some say clutch may be going out when riding with me. How can this be? Please help as I have spent more than $4000.00 already and I cannot afford to do it again!
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Friday, October 9th, 2009 AT 12:53 PM

5 Replies

Tiny
SERVICE WRITER
  • EXPERT
What are the codes now present?
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Friday, October 9th, 2009 AT 7:23 PM
Tiny
BOGAN59
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That's the problem. It never showed the codes at first and it doesn't show any codes now. It only showed codes after the transmission was damaged. Had it checked by several reliable mechanics.
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Sunday, October 11th, 2009 AT 7:21 PM
Tiny
SERVICE WRITER
  • EXPERT
When does the shifting problem happen?
Warm or cold engine?
Between any particular gears?
Was the torque converter replaced at the same time as the transmission?

What exactly happens when the symptom occurs that you are experiencing?
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Monday, October 12th, 2009 AT 6:27 AM
Tiny
BOGAN59
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Shifting problem is very intermittent. Happens when cold and when hot. Seems to be a harsh shift into first from dead stop only every once-in-a-while. Sometimes if feels like it didn't downshift all the way when it occurs. At times, it begins shifting hard between all geers especially with multiple stop and goes.

I have no idea if the torque converter was replaced.

I did find an old report from Firestone when engine light came on when I was on vacation in Florida. The 2 codes that came up were P0101B Mass Air Flow Sensor Performance. (They found a loose clamp at the sensor and tightened, then retested). Also had a code of P1811C Max Adapt and Long Shift Transmission code. I was about 1000 miles from home on a Sunday and this was the very fist time that any codes at all came up.

I have since researched the P1811C code and found information online from:
Section 01 - Transmission/Transaxle
Bulletin No: 00-07-30-002B
Date: July, 2002

Subject:
Slips, Harsh Upshift of Garage Shifts, Launch Shudders, Flares, Erratic Shifts and Intermittent Concerns. DTC P1811 Set (Replace Pressure Control Solenoid Valve Assembly)

This was for many GM's from 1999 - 2002.

Don't have current codes and since then many items were replaced on my vehicle.

Does the Pressure Control Solenoid Valve Assmembly get replaced as part of a new transmission?

Also, since my last post, the Temperature Gauge is going crazy maxing out at times on my display. No engine lights are ever present. Smell an electronic burning smell in trunk that wasn't there before. (I work on computers and networks for a living and know the smell very well!)

I looked up problems with Key Fob as well, since my car seems sort of "moody" and sometimes it will not lock in the mornings, but will in the afternoons. That research lead to possible PCM module problems which has also been replaced.

As of this posting, still have odd Key Fob problem, still hard shifts and slips harshly into first only intermittently. Temperature gauge goes up and down at will, but engine is not even hot to the touch!
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Monday, October 12th, 2009 AT 10:43 AM
Tiny
BOGAN59
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After Speaking with my GM Mechanic about the previous post of error codes, he stated that all had been replaced, so it could not have been any of the solenoids, display panel or PCM.

Problem still persists and mechanics are unable to resolve.

What in the world could it be?
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Tuesday, November 3rd, 2009 AT 11:23 AM

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