When driving seventy mph vehicle acts like it is in neutral, code P0894

Tiny
RICK5472
  • MEMBER
  • 2004 CHEVROLET TRAILBLAZER
  • 4.2L
  • V6
  • 2WD
  • AUTOMATIC
  • 160,000 MILES
Driving down interstate around seventy five mph my car acts as if it was in neutral. I pulled over checked fluid and drive shaft. Towed it home talked to mechanics. Told them the code it pulled (P0894) and that I have had no problems from the transmission. I changed fluid and filter around 8,000 miles ago. I had a rebuilt 4L60E installed and it is still doing the same thing. I have gone through the gears to circulate the fluid. I have checked linkage all fuses. Fluid is at correct level. Any advice?
Monday, April 2nd, 2018 AT 10:50 AM

9 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon.

The 894 possibilities are below.

When you replaced the transmission, was the torque converter changed as well?

Roy

P0894
Item Description
Symptom/DTC P0894
Descriptor
Probable Causes:
2-4 Band Assembly.
3-4 Clutch Assembly.
Automatic Transmission (AT) Fluid and Filter.
Forward Clutch Assembly.
Input Housing and Shaft Assembly.
Oil Pump Assembly.
Sediment.
Shift Solenoid (SS) Valve.
Torque Converter Assembly.
Torque Converter Clutch (TCC) Pulse Width Modulated (PWM) Solenoid Valve.
Torque Converter Clutch (TCC) Solenoid Valve.
Transmission Fluid Level.
Valve Body Assembly.
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Monday, April 2nd, 2018 AT 11:21 AM
Tiny
RICK5472
  • MEMBER
  • 5 POSTS
Yes.
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Monday, April 2nd, 2018 AT 11:27 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, did they re flash the transmission control module?

The next step is to do pressure tests on the transmission to see if the front pump is working.

Did you get a warranty with this transmission?

Roy
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Monday, April 2nd, 2018 AT 11:32 AM
Tiny
RICK5472
  • MEMBER
  • 5 POSTS
I did not have the TCM reflashed. Is this something that I need to have done? Yes I got a warranty with the transmission.
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Monday, April 2nd, 2018 AT 11:39 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Even if it was the flash, it would still engage in gear. The flashing would control shifting.

The issue is mechanical since it will not engage into gear.

Do you have a set of gauges to do some pressure test?
Roy
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Monday, April 2nd, 2018 AT 11:45 AM
Tiny
RICK5472
  • MEMBER
  • 5 POSTS
No I do not have the gauges. Would there be any electronic module or the internal wiring harness?
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Monday, April 2nd, 2018 AT 11:52 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
No, even if there was, it would still go into gear. It is a mechanical issue.

Did you install it yourself or did someone do it for you?

Roy
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Monday, April 2nd, 2018 AT 12:01 PM
Tiny
RICK5472
  • MEMBER
  • 5 POSTS
I installed it and it shifts into gear just does not move. I can hear the engine rpm's change when shifting gears.
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Monday, April 2nd, 2018 AT 4:23 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Yes, but it should go into reverse and drive and move. There are no electronics for that. It is mechanical.

It sounds like you have a bad transmission. I would call the supplier and tell them.

Roy
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Monday, April 2nd, 2018 AT 5:38 PM

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