Shifting hard and when you out it in Drive

Tiny
SANTIF21
  • MEMBER
  • 2002 CHEVROLET CAVALIER
  • 2WD
  • AUTOMATIC
  • 150,000 MILES
I just got this car today the Trac light came on out if no where the engine lights on. It shifts hard when you hit 14 mph then when you put it in Drive it shift hard. What do you guys think the problem is? The car listed above is a 2 door. Please help me.
Thursday, July 23rd, 2020 AT 11:28 PM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning

Can you give me the code that is set?

You can get it checked for free at a parts store. Once I know the code, I can narrow the area of failure.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

With the trac light on, the ABS has the fault and this may be the reason for the hard shifting.

https://www.2carpros.com/articles/abs-warning-light-on-easy-repair-guide

There was a TSB for the hard shifting, whch I posted below, but we need to check the coes first before talking about a valve body issue.

Roy

TSB

Incorrect Transmission Shifts, Poor Engine Performance, Harsh 1-2 Upshifts, Slips 1st and Reverse, Torque Converter Clutch (TCC) Stuck Off/On, DTCs P0757, P0741, P0742, P0730, P0756
# 02-07-30-013E - (May 20, 2005)

Models:
2001-2005 GM Passenger Cars with 4T65-E Automatic Transmission
2001-2005 Buick Rendezvous
2005 Buick Terraza
2001-2004 Chevrolet Venture
2005 Chevrolet Uplander
2001-2004 Oldsmobile Silhouette
2001-2005 Pontiac Aztek, Montana
2005 Saturn Relay

with 4T65-F Transmission (RPOs M15, MN3, MN7, M76)

This bulletin is being revised to include additional diagnostic information and clarify model usage. Please discard Corporate Bulletin Number 02-07-30-013D (Section 07 -- Transmission/Transaxle).

Condition

Some owners may comment on any one or more of the following conditions:

The SES lamp is illuminated.

The transmission slips.

The transmission does not shift correctly, is very difficult to get the vehicle to start moving or the engine lacks the power to move the vehicle.

Poor engine performance.

Cause

The most likely cause of the various conditions may be chips or debris:

All years--Pressure Reg. Valve (Bore 1) or Torque Signal Valve (Bore 4) stuck
On 2001-2002 vehicles, a plugged orifice on the case side of the spacer plate.

ON 2003-2005 vehicles, restricted movement of the 2-3 shift valves in the valve body.

On 2003-2005 vehicles, restricted movement of the 3-4 shift valves in the valve body.

Technician Diagnosis and Correction

The technician's road test reveals the vehicle launches in third or fourth gear (high RPM with slow vehicle acceleration).

On 2001-2002 vehicles, a DTC P0756 or P0757 may be stored.

On 2003-2005 vehicles, a DTC P0730, P0741, P0748 or P0757 may be stored.

Refer to the appropriate Service Information (SI) for additional Diagnostic Assistance.

With a Tech 2(R) connected to the vehicle, road test the vehicle and perform the following steps:

If the above symptoms are present proceed with the following steps.

1. With the valve body removed and on a workbench, carefully push the valve against spring pressure to check if the valve will snap back to the original position. Or for the valves seated in home position, use a small flat-bladed screwdriver and carefully pry the valve off its seat, quickly remove the screwdriver allowing the valve to return to its seat. If the valve does not snap back unencumbered, then the valve will need to be removed from the valve body.

imageOpen In New TabZoom/Print

2. Once the valve is removed, inspect for any scratching or scoring.

3. If any scratching or scoring is found, then the fingernail test will need to be performed.

Important:
It has been found that in most cases that the scratches are not severe enough to catch your fingernail.

4. Using your fingernail, move over any scratches to see if your nail will catch on the scratch or score.

If your nail catches in the scratches, the valve will need to be replaced.

If your nail does not catch in the scratches, continue with the next step.

6. Important: Clean the valve body with the machined side down so debris may escape.

7. Clean the valve and bore using brake cleaner.

8. Blow off with shop air.

9. To verify free movement of the valve, dip the valve into clean ATF and install the valve back into the appropriate bore. The valve should move freely. If the valve moves freely, in most cases the valve body will function properly when reinstalled.

10. Reassemble and retest
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Sunday, July 26th, 2020 AT 5:31 AM

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