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What is signs off a bad tcm problem - 1992 Honda Accord

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Can a bad knock sensor cause a tranny to go stay in 2nd gear(limp mode)on a 2008 dodge ram 3.7 liter.Got 2 codes a #2 knock sensor and tcm power low voltage


The transmission is in limp-in mode because of the second DTC - TCM (transmission control module) low voltage. The knock sensor code has nothing to do with that. You need to have the TCM and transmission checked out.

Oct 15, 2016 | Dodge Cars & Trucks

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I get code p0700 after an OBDII scan.


P0700 Transmition Control system is the transmission control module.
The transmission control module is a separate computer module, you need to read codes stored on transmission control module.

If there are no transmission code stored, then there is a bad Transmission Control Module (TCM) ground circuit or a bad TCM. In that case the ground to TCM must be tested, and TCM eventually replaced.

Faults that can cause troubles when shifting from first to second gear are : transmission fluid, speed sensor, TPS, transmission shift solenoid, gear box problem, TCM, neutral switch, torque converter problem.

The best thing to do is scanning TCM codes.

on Dec 02, 2009 | Jeep Wrangler Cars & Trucks

2 Answers

What are possible causes of P1768 code on a 2001 Chrysler PT Cruiser?


Do the easiest things first:
Check the battery earth lead (bear in mind that if you disconnect the batter you will probably have to re-enter the radio code). Check where it connects to the body/engine block - make sure it is clean and secure.

Then check every other earth lead you can find

Feb 24, 2016 | 2001 Chrysler PT Cruiser

1 Answer

Transmission -does fine until it warms up, then does not want to shift correctly, drive begins flashing.


d flash mans, tranny fault
so scan it. us the obd2 scan tool, any and scan it.
the A/T IS VERY complex, do the tests shown in the FSM
guessing dont work
but in general (experience)
wont shift correctly dont cut it. (200 parts, and 50 was to mess up)
????
flare, skips gears, wont up shift, wont down shift, or shifts wrong speed. what gears work, what dont. just a clue and help goes get better
The tranny TCM can go to limphome mode, this mode is very clear.
and covered in the FSM and
one common failure, that happens with high mileage and poor service (not doing a flush at 50k miles)
is stuck in 1st gear, hot. only.
the ATF fluid gets more thin hot and pump output drops
this is usually a vary bad sign.
the Stall test fails.
the pump pressure test fails, hot.
there is no vacuum lines to this electronically shifted trans.
the ended back 1990(about). with old 3speeds.

scan it, could be something slimple like
the PRNDL shift switch fibbing like crazy. (common)
this car has TCM, a transmission brain.
look for OBD2 DTC errors P07xx (trans)
this TCM (part of PCM) function relies on sensor for shifting
they are:
1: TPS
2: engine INPUT rpm
3: tranny output rpm
4: shift selector.
5: ECT (engine temps)
6: ECU part of the PCM calculates load at all times and sends that to the TCM , so that TCM can down shift on hills, or upshift faster on the flat or down hill.
this LOAD feature is what replaced the VACUUM of old days.

The D light , hopefully is just a bad input (cheap)
scan it. and see, its begging for you to do that.

Jan 02, 2014 | 2001 Honda Odyssey

1 Answer

2001 kia sephia slips out of gear. Trouble codes P1500, P1624, P0740.


Low fluid or too much ATF? (foaming it up and killing bearings)

p07xx is tranny DTC codes. (errors)
TCC lockup failure. (the TCM commanded the lock and
the tail shaft sensor did not rise in RPM
that is the engine RPM does not match tail RPM or 1:1 ratio.
which is LOCK ratio.

1500 is speed sensor , reads wrong,
No Vehicle Speed Signal to TCM.

1624 means.
MIL Request Signal from TCM to ECM.
the means simply the Tcm SAW and error and sent that error up stream to ECM. creating 1500.
remember the ECU never knows what part is bad.
NEVER ! it only knows, the tests failed. (monitors)
the first thing i do is find out which VSS failed.
on some cars there are 2 to 5
the first speed sensor is RPM does the scan tool show correct engine RPM? y/n
if yes,
does the scan-tool show correct MPH? sensor 2.
y/n if not fix that first.
the TCM function (tranny brain must not be lied to, in this order)
engine RPM , MPH.
and last the tranny its self as VSS (rpm) sensors. 1 to3.
my guess, (too lazy to look it up) has 1 sensor on the tranny tail.
if all is good and 1500 means VSS 2 tranny tail is fibbing.
then its one of 3 things.
(all others good)REMEMBER the TCM does comparisons to all speed sensors to shift the car correctly so the front sensor count first. then last the rear.
VSS2 lies. this is bad bad tranny (slips) bad wires to VSS2 or bad VSS2.
most TCM go to limp home when the tranny slips to stop burning up the clutch packs. may skip gears too.

now what does slips out of gear mean. a neutral FLARE?
or down shifts,
if the tranny ever slips. this is bad news.
if it does slip 1500 is only the warning that it did
it say RPMs go out of control and threw 1500 pronto.

Try to think(sic) like a TCM what would you do if the tranny malfs.
answer, throws codes.
and goes to limphome, if necessary, (FSM show these facts)
so does alldata dot com
what i do is try to get tranny to slip. using all gears.
if it slips ,its bad.
The TCM can not run a slipping tranny.
the TC does slip, but the TCM has that all figured out. (modeled)
not locked, and locked it must not.
good luck and do ask questions.

Oct 16, 2013 | Kia Sephia Cars & Trucks

1 Answer

97 nissan pickup 4x4. 4x4 doesn't work when engaged?


Hi, the system will need to be scanned for trouble codes in the transfer case control module to know what the exact problem is for sure, but normally on this vehicle, one of two problems. Either the encoder shift motor is bad or the transfer case control module is at fault. Without scanning not much you can do here, there is one thing you can check, this vehicle is somewhat know for water instrusion in the tccm. Remove the tcm and unplug the connectors and see if you see any signs of mositure, the connector may appear green in color, this would be a sign of water intrusion. The tcm is mounted behind the passenger front kick panel...

May 14, 2011 | 1997 Nissan Pickup

3 Answers

Car does not run ,I check the code ,it is P0700


Because it is not starting, you should replace the Crankshaft sensor (above the oil filter, back of the engine)-it will cause a P0700-I have a 99 SL2, 178,000 miles


DTC) CODE # P0700....Transmission Control System (MIL Request)
Translation: Transmission Control Module (TCM) Malfunction or Failure. P0700 Information Code The Transaxle Control Module (TCM) monitors the malfunction of sensors and actuators relating to transaxle control. If any malfunction is detected, the TCM informs the PCM by sending a signal (P0700 code). P0700 means that a code has been set in the TCM. This code is for information ONLY. If this code is present, check for transaxle codes. So basically, the P0700 code is telling you to check the TCM for a transaxle DTC. The TCM can not turn on the check engine light so it has the PCM do it. The dealer probably saw the code P0700 and went to the TCM and pulled out the code stored there telling them the Transmission Solenoid Assembly (TSA) is bad. This is a good example of understanding what the codes actually mean. If the manual you looked at said the TCM is bad and to replace the TCM when you see a P0700, then it is wrong.

Jan 24, 2011 | Saturn Ion Cars & Trucks

3 Answers

Check engine light is on with code p1698 what is this code


The code P1698 is: No CCD messages from TCM. That means the communication between the Transmission Control Module and the Power Control Module is lost. Sometimes this happens when a PCM, or TCM is replaced without being flashed, a bad connection at the PCM, TCM, or a bad TCM. Hope this helps.

Mar 04, 2010 | 1999 Dodge Caravan

1 Answer

My 1992 honda Accord wont shift out of park, the brake lights work still but have to use manual shift override button to get ouy of park


The interlock solenoid is provide with power by the Transmission control module (tcm) when the brake pedal is applied3f09359.jpg and then grounded by the gear selector switch in park. If you access the connector to the tcm, you can check to see if it's getting a ground signal and check the solenoid. Pull the harness connector off the tcm and apply 12v to the harness connector pin that leads to the white wire with a green stripe as seen in the diagram. If the solenoid clicks, you may have a bad tcm. If the solenoid does not click, you may have a bad solenoid, or bad selector switch. The tcm is under the front passenger footwell.

Feb 03, 2010 | 1991 Honda Accord

2 Answers

Have 2001 chevy 2500hd with a code 0700 bad tcm. can you tell me where it is and how much do they run.


P0700=Transmission Control System (MIL Request)
Does not mean bad TCM,=transmission control modual,
all that happen here was the computer did not like the responce it got from a sensor,and requested the check engine light be turned on.
You need to have it scanned by a shop if it reappears

Dec 25, 2009 | 2003 Chevrolet Silverado 2500HD

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