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Where is the TCU on a 1994 firebird located that controls the transmission shifting?

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The TCU is located underneath the passenger side kick panel inside the cabin

Posted on Oct 11, 2010

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92 honda lx automatic is surging, not shifting right


Can be a few things. 1) Check the shift solenoids on top of the transmission (front). Remove them and clean out the screens. This would mean your transmission fluid is over due for changing. 2) Maybe it's the Vehicle Speed Sensor (VSS), locate and change that. It's on top of the transmission back under the thermostat area. 3) It could be your Transmission Control Unit (TCU). It's under the floor carpet on your passenger side near the firewall. There is a metal plater covering your ECU and your TCU. The TCU is the smaller box. Remove it, open it and look for burnt items. If you're handy you can replace those items. If you are replacing the unit, make sure it is from a known good one and it matches your car exactly, ie: EX, LX, DX, SE, sport shift button present?, etc... on the circuit board.

Below is a picture of the TCU opened up, here are the transmission codes that your car can display if you are inclined to jump the OBD wire plug to get the reading.

TCU Codes:

CODE LIST:

1-Lock-up solenoid 'A' circuit open or shorted.
2-Lock-up solenoid 'B' circuit open or shorted.
3-Throttle Position Sensor circuit open or shorted.
4-Vehicle Speed Sensor open or shorted - No signal from speedometer.
5-Shift Lever Position Switch circuit shorted.
6-Shift Lever Position Switch circuit open.
7-Shift Solenoid 'A' circuit open or shorted.
8-Shift Solenoid 'B' circuit open or shorted.
9-Counter shaft or transmission speed pulse generator open or shorted.
10-Coolant Temperature Sensor open or shorted.
11-Engine RPM (Ignition coil signal) open or shorted.
12-(No code 12 used)
13-Main shaft speed pulse generator open or shorted.
14-Linear (line pressure control) solenoid open or shorted.
15-Kick down switch circuit shorted.

064bef5b-bee7-4ef7-9ccb-98c692c687bc.jpg

Oct 12, 2013 | 1992 Honda Accord

1 Answer

Were is the shift control module for the transmission on a 95 gmc jimmy?


ebcf5836-29ff-419d-b9a3-f97cbff11788.jpgthere is no tcm ...but the pcm (powertrain control module) is controlling the transmission. here is a diagram
hope it helps

Oct 02, 2013 | 1994 Pontiac Firebird

1 Answer

I have a 1992 honda accord dx, i can be in park and the D4 light is on, and the transmission will not shift properly when i put the car in gear, if the light goes out the car runs great, what do you think...


HI. This is a TCU fault. This is intermittently occurring at this time, but it will eventually get worse. You will need to have the TCU scanned for possible transmission trouble codes. I suspect that the TCU will need to be replaced or there may be an issue concerning the solenoid pack. You will need those codes to know for sure.

TCU - Transmission Control Unit

Aug 26, 2010 | 1996 Honda Accord

2 Answers

I have a 1994 Pontiac Firebird Trans Am with an automatic transmission. I get an intermittent service light and a P0029 code is referenced. When this happens the car seems shift harshly. I thought P0029 is...


It's an exhaust valve inside the transmission, when the solenoid isn't working right, the pressurized fluid can't exhaust through the passages, which can cause rough shifting. It has to be taken to a transmission shop, the transmission pan has to be dropped and possibly the valve body to get at the solenoid. Hope this helped.

Nov 14, 2009 | 1994 Pontiac Firebird

1 Answer

97 mitsubishi eclipse transmission problems automatic 2.0


I have a 95 Eclipse and I recently had to change out my TCU........ Transmission Control Unit, This should be located directly beneath the center console. First I would have the transmission services if problem persist then proceed to changing out the TCU you can get off of ebay. As far as i know there should be 3 Computers in our cars. 1 the Electronic Control Unit located behind radio 2 Transmission Control Unit located under center console and 3 Airbag Control Unit located under hood, Hope this helps.

Mar 03, 2009 | 1997 Mitsubishi Eclipse

1 Answer

Transmission stuck in forth gear check engine light is on.


Your TCU (transmission Control Unit) is bad. it is located behind the passenger side kick panel. you can purchase it on ebay for about 79.00 with exchange.

Lugnut61

Feb 08, 2009 | 1992 Honda Accord

1 Answer

Hello, I own a 93 toyota forerunner, 4*4, v6, automatic. Transmission was only shifting at very high rpms. Replaced trans with another out of identical vehicle, transmission will not shift, disconnected...


The transmission is controlled by the Transmission Control Unit (TCU).

Throttle position, rpm, and speed are input parameters to the TCU. The TCU has a default set of shift patterns. These shift patterns change over time based on your specific vehicle setup and driving habbits.

The shift patterns are only slightly affected by driving habbits over many driving cycles. But, changing the relationship between the throttle position and the actual speed being reported by the speed sensor can have an immediate effect on shift patterns.

While your speedo may now be correct, the realtionship between rpm and thottle position has not been corrected. That would take a gear change in the differentials.

The TCU can be reset to an inital learn base line. When this is done, the TCU will instantly learn the dynamics of your setup.

Any shop with an advanced ODB scan tool can reset the the TCU. The dealer or a transmission shop would be preferable.

You really should change your differential gears as opposed to resetting the TCU

This information was posted by ftgiles here

Jan 06, 2009 | 1993 Toyota 4Runner

1 Answer

Where is the tcu in a 2002 honda accord


it is the Transmission Control Unit. you have to find the reason why the TCU is flashing the D4 fault code. not replace the unit. have your vehicle scanned for another code. your transmission or transaxle is giving you a warning that something is wrong .

Nov 20, 2008 | 1992 Honda Accord

1 Answer

1990 Honda Accord Transmission Shift Problem


Your TCU (Tranmission Control Unit) is bad, It is located behind the passenger side kick panel. There is a diode that burns out. it can be bought on ebay for about 79.00 with exchange.

Lugnut61

Sep 13, 2008 | 1995 Honda Accord

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