Transmission trouble? Sometimes my car will not go over 50 mph and the rpm is at 4, Ive changed the pcm\tcm but it still has this problem what else could it be?

so did not check all fuses first?
then scan the PCM for all transmission DTC errors first?
oops.
1999 dodge durango 5.9L (46RE TRANS i GUESS)
there is no , in or on tranny input speed sensor
the PCM uses ENGINE RPM for that. (crank sensor RPM, CKP)
if you scan the PCM you will not see DCT error for input speed sensor there is none.

Trouble Code: P0753 (5.9L V8 VIN Z Auto)
A/T 3-4 Solenoid/Transmission Relay Circuit Failurenone there below. but sure CKP is. crank speed
and SOL 2 and gov pressure, are key.

SOLENOID 2 bad? above.
why are you not scanning it first. for DTCs
what if governor pressure signals are wrong. pin 29
what if the scan told you it was. likethis.
examples
Trouble Code: P0700 (5.9L V8 VIN Z Auto)
Automatic Transmission Control System Malfunction
Trouble Code: P0711 (5.9L V8 VIN Z Auto)
A/T Transmission Fluid Temperature Sensor Signal - No Rise After StartupTrouble Code: P0705 (5.9L V8 VIN Z Auto)
A/T Check Shifter Signal Circuit Malfunction''
Trouble Code: P0715 (5.9L V8 VIN Z Auto)
A/T Input Speed Sensor Circuit MalfunctionISS is what? (CKP is my guess)

lots more on gear errors
then
Trouble Code: P0748 (5.9L V8 VIN Z Auto)
A/T Governor Pressure Solenoid/Transmission Relay Fault783 is last one. lots of P07 errors on this box
all covered in the service manual in detail.
learn that some cars the PCM has what are called virtual or derived sensors, like engine load is (used to shift too)
and inputs speed, is CKP sensor and ABS the 4 sensors abs are averaged to do speed.(mph)
but in this case it is crank speed CKP
no PCM schematic shows any ISS at all

one can not fix modern cars lacking a SCAN tool, USA OBD2 .
not really and ASE class Day 1,
read all TSBcheck all fusesscan it.service manual online, great !
https://eautorepair.net/Marketing/Default.asp

theory and reviews

https://tgdaily.com/technology/onwheels/chrysler-corporation-and-the-46re-transmission-what-you-need-to-know/

the RE is electric shifted the older RH is hydramatic, shifted and not the same thing,so how can if fail.
sure speed sensors sure.but what else.
the pcm fails to pick he 3rd gear soleniodthe PCM is in limp mode.the gov signal sensor is bad. and wrong (not sure how to replace it me., output sensor dead. (no)PCM sees gross CKP errors crank RPM way off or skips.low pump pressure in the transservo drive to band failing and no 3rd gear. possible.more simply after scan replace this set kit.https://www.ebay.com/itm/194076774950?hash=item2d2fe09226:g:flYAAOSwX9FZKCwl&amdata=enc%3AAQAHAAAA8Auj9VxgzbBbY1y72FuSN8kY5Rr6S3No4BqIm0Ahxvpol8ifEkPhCjcL9RfwxI1dPT9gboPhrqEcTmFagdyeF9TiffbFSjrtI7XOnIbc8G%2F6JCafmPc6idA7aFhq5Y%2FTxfPDpQyhD1vs1akPE%2FD%2FoH3e9fD3d%2BwcwGu4N0GMG1fIDbLPAnG6cWwwzGUd9zPVWm9tFxHxI1viGJn2aLG7%2F3zQjo4VHwpnCeea9lwjV18DOhcloDRRJMzBojw3Hfb8xJdJUJb2cwSgy1LKickqaxU8QdQHy2zv8NBG1ACbb3ZN%2FE9bD%2FlT1cBqykbdirlNlA%3D%3D%7Ctkp%3ABk9SR4SKlvbYYA




A500 / A518 / A618
(42RE / 44RE / 46RE /47RE /48RE)
Chrysler Jeep Dodge Ram
Fits 1996-99This Package Contains:
One (1) New Borg Warner Pressure Solenoid(EPC)
One (1) New Governor Pressure Sensor (Transducer)
One (1) New Overdrive & Lock-up Solenoid Assembly & Harness
One (1) New Governor Solenoid Body Gasket


recap and conclusions. electronic shifted trans. TCM
not getting 3rd gear has many causes:
I'd hazard a guess that pump output pressure and regulator are working in the box. (1 >>2shifts ok)
3rd gear solenoid not dead?
and the lies told by governor pressure sensor, makes the TCM shift wrong (computer GiGo logic) caused.
3rd gear servo piston dead.
or some odd Limphome mode, (iDK them all) (ignoring DTC errors? ) Some trans in limp slip a gear.
The governor must see tail shaft speeds correctly or it will not up-shift all the way.

a scan tool can be bought or rented. or ask others to scan it, any shop can, or some Autostores can
there is no reason no to scan it after fuses check, unless 3 gear is needed to get there (hummmmmmm)
$100
also the tool pays for it self (it's free man) the first $100 in labor not spent,. amazing facts no?
a real scan tool not $20 lame code reads,
a real tool see all Dodge codes.
cheaper readers only show DTC errors only with "CEL lamp ON"< , P07xxx code (7 means transmissions errors)
better tools start at %100

launch band can, CRP123

https://www.amazon.com/gp/product/B01HNO5PLY/ref=as_li_qf_asin_il_tl?ie=UTF8&tag=obdadvisor-transmission-20&creative=9325&linkCode=as2&creativeASIN=B01HNO5PLY&linkId=0ad31cf15bd381a27e78921099f807d3




see reviews here,

https://www.backyardmechanic.org/our-picks-for-best-obdii-scan-tools-that-read-transmission-codes/


the fuse that runs pin 16 on the OBD2 DLC scan port (12vdc ) must not be blown or the scantool fails (not broken fails to communicate)

this is a TCM (tranny brain) operated, A/T
so scan it, in this old car , it either scans with the PCM or
has its own blink codes, the TCM.
D4 means, TCM is Unhappy, please scan me for lastest news !
the engine too, is bad. but id fix that first because the tranny brain
uses,. 4 engine sensors to run'
so scan the PCM (engine brain) first. fix that first.

alldata.com has all this.. every word every step.
why not read that.?
connect scan tool $9 tools work, and scan the PCM. (ask)
get all DTCs (errorrs) and most them,, here ill also lookup
how to scan your old TCM now.
here is lots for free books on this car.
http://hondatech.info/downloads/Auto/Manuals/Accord/

the PCM when scanned will report 10 unique DTC errors
for the transmission.
and VSS, ECT, TPS, and CKP sensors must be good or
the tranny will fault.

98
http://downloads.hondatech.info/Auto/Manuals/Accord/Ab0VE.Honda%20Accord%20ESM%2098-00_CD_ISO.zip

have transmission shop check it out.make sure transmission fluid level correct.and filter been changed.but let transmission shop code scan for faulty shift solnoid second third gear.or check for faulty PCM or TCM could be problems in the governor pressure solenoid.need scanner to trouble shoot.

well yes but no,the speedometer signal comes from speed sensor in the transmission then goes through the ecm/pcm via the tcm (transmission control module, then on to your speedo,if the speed sensor goes bad usually the speedometer will work crazy if not at all also the instument clusters also go bad causing failure too find a new tech dude

Hi Mati:
Diagnostic trouble code (DTC) TCM-000C is stored if the control module detects that the vehicle speed and engine speed (RPM) signals do not correspond with the programmed values and that an "incorrect" gear is being used in relation to the calculated gear. This is because solenoid S2 is stuck in open or closed position.

Diagnostic Codes: 000C, 002A, 002B, P0733, P0734, P0756
Tests/Procedures:
1. Clear codes from the Transmission Control Module (TCM).
2. With fluid hot, check transmission fluid for quality and level.
3. Test drive the vehicle. Accelerate from 20-60 MPH when in geartronic mode, gear 4. While doing this, watch input and output speed sensors with a scan tool.
4. If the code returns, the transmission is slipping, and the input and output speed sensors are updating, the problem is internal to the transmission.
5. If transmission is replaced, test ATF for coolant contamination per TNN 43-48. Replace radiator if necessary.

Potential Causes: Transmission Mechanical Problem

Tech Tips:
TCM-002B 4th gear. Incorrect gear ratio. This code sets when the actual gear ratio deviates by more than 10% of what is programmed into the TCM.
TCM-002A 3rd gear. Incorrect gear ratio P0756 - TCM-000C - Shift solenoid S2, hydraulic malfunction If the transmission is replaced, be sure the mating surfaces between the engine and transmission are bare metal and clean. If not, the engine may not start after assembly.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day

This is what your codes mean:

Trouble Code-P0734 (A/T Additional Gear Ratio Error In Fourth Gear)


Trouble Code Conditions:
Vehicle driven to a speed of 4-37 mph at more than 500 rpm, gear selector in 4th Gear in Drive, and the PCM detected too much difference in the engine speed and output shaft speed.
Possible Causes:

• Customer may complain of intermittent 4th gear operation
  
• O/D and 2/4 pressures less than 75 psi
  
• O/D or 2/4 clutch volume indexes out of specification
  
• O/D accumulator seals are damaged
  
• Transmission enters "limp in" mode running in 4th gear
  

Trouble Code-P0735 (A/T Gear Ratio Error Fourth Prime)

Trouble Code Conditions:
Vehicle driven any forward Gear, and the TCM detected the ratio of the Input speed to the Output Speed did not match the current Gear Ratio (this test can take up to 5 minutes).
Possible Causes:

• Related Gear Ratio trouble codes may be stored (note that some of these Gear Ratio trouble codes may be intermittent)
  
• Transmission has internal problems or damage present
  

You have a transmission problem.Hope this helps, James Booth

Please don't forget to rate!


Trouble Code: P0871 (3.5L V6 VIN G Auto)
A/T O/D Pressure Switch Circuit Malfunction

Trouble Code Conditions:
Engine started; vehicle driven in a forward gear, and the PCM detected that the O/D Pressure Switch circuit indicated open or closed at the wrong time.

Possible Causes:

• Related DTCs may be present
  
• O/D pressure is incorrect, or internal transmission faults exist
  
• O/D pressure switch circuit is open, shorted to ground or power
  
• O/D pressure switch is damaged or it has failed
  
• TCM relay power circuit to O/D switch is open (loss of B+)
  
• Intermittent wiring or connector problems exist
  
• PCM or TCM has failed
  

Trouble Code: P0700 (3.5L V6 VIN G Auto)
Automatic Transmission Control System Malfunction

Trouble Code Conditions:
Ignition on or engine started. The PCM received a message over the CCD Bus from the Transmission Control Module (TCM) that it had detected a problem and set a trouble code in memory.

Possible Causes:

• The presence of this code means the TCM detected a problem
  
• TCM related Sensor has solenoid is damaged or has failed
  
• This code is for information only - check for other TCM codes
  
• TCM or PCM has failed
  

This is what your codes mean:

Trouble Code-P0734 (A/T Additional Gear Ratio Error In Fourth Gear)

Trouble Code Conditions:
Vehicle driven to a speed of 4-37 mph at more than 500 rpm, gear selector in 4th Gear in Drive, and the PCM detected too much difference in the engine speed and output shaft speed.

Possible Causes:

• Customer may complain of intermittent 4th gear operation
  
• O/D and 2/4 pressures less than 75 psi
  
• O/D or 2/4 clutch volume indexes out of specification
  
• O/D accumulator seals are damaged
  
• Transmission enters "limp in" mode running in 4th gear
  

Trouble Code-P0735 (A/T Gear Ratio Error Fourth Prime)

Trouble Code Conditions:
Vehicle driven any forward Gear, and the TCM detected the ratio of the Input speed to the Output Speed did not match the current Gear Ratio (this test can take up to 5 minutes).

Possible Causes:

• Related Gear Ratio trouble codes may be stored (note that some of these Gear Ratio trouble codes may be intermittent)
  
• Transmission has internal problems or damage present
  

You have a transmission problem.

P0700 (M)
Check Transmission DTC's
This code indicates that the EATX (Transmission controller) has an active fault and has illuminated the MIL via a BUS message. The specific fault must be acquired from the EATX via a DRBIII tool. (Input or Output Speed Sensor failures often cause this code and are a common failure part on WJ Grand Cherokees

P0750
Shift Solenoid circuit.
Note: If code P1767 (Transmission Relay Always On) is also present: Replace transmission solenoid assembly. See note provided. When transmission is in limp mode the relay that provides power to the solenoid group is switched off. This is normal and is designed to provide operation in one gear only. Engineering department suggests to replace transmission solenoid assembly anytime these two trouble codes occur together. See applicable service manual section (21) for solenoid assembly replacement directions. IMPORTANT: When performing this repair always check torque on all valvebody accumulator cover plate screws. Proper torque specification is 70 inch pounds. If any accumulator cover plate screws are damaged or missing replace the valvebody assembly. NOTE: If any other trouble codes are present do not replace solenoid assembly. See test in the applicable Transmission Diagnostic Procedures Manual

P0755
Shift Solenoid B

the pcm may have a cracked board, i had an 88 cavalier z24 with the same problem, replced the ecu and it ran fine, the problem is that the boards inside the pcm crack and lose connection, the next time it acts up open the glove box and try tapping on the pcm, if the car responds at all, the pcm is bad