Trouble code p 1698 no message from tcm - Grand Caravan Dodge Cars & Trucks

code p 1625 refers to CAN databus, TCM--incorrect signal===causes --TCM trouble code/s stored---TCM incorrectly coded---wiring---matching resistor in ECM
I don't have a listing for code p 1749 but codes 1748 and 1750 are concerned with TCM defective and voltage supply low
so after you check the wiring and connections form the transmission you have 2 options
use a known good ECM to replace yours ( will eliminate any ECM faults)
and/or replace the TCM module on the transmission

1684= BATTERY DISCONNECTED WITHIN LAST 50 MILES.
1698 PCM FAILURE EEPROM WRITE DENIED ALSO
1698 NO CCD MESSAGES FROM TCM/ OR BCM

Hi Cornejo:
The DTC (Diagnostic Trouble Code) P0700 code is not the actual code that is of concern. The P0700 code is stored in the engine computer.

This code means that there is a code stored in the Transmission computer. The trans computer sends a message to the engine computer that there is a trans code stored. This lets the engine computer turn on the "check engine" light.

You need to have the transmission computer scaned for codes to find out whats going on. Most code readers do not read trans codes, you need to have a scan tool that is able to do this.
This could mean almost any thing. Most trans codes are eletrical related with the allison transmission.
Here is the diagnosis chart for the P0700. Again, this code only means a trans code is set in the TCM, not a actual failure code.
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DTC P0700
Circuit Description
This diagnostic trouble code (DTC) indicates that a related transmission DTC set in the transmission control module (TCM). The engine control module (ECM) receives the TCM DTC information over the serial data circuit. The ECM turns ON the malfunction indicator lamp (MIL) when the TCM sends a message over the serial data circuit requesting MIL illumination.



Conditions for Clearing the DTC graphic
The control modul turns OFF the MIL after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
A scan tool can clear the code from TCM history. The TCM automatically clears the DTC from TCM history if the vehicle completes 40 warm-up cycles without failure.

1. Verify power and ground supplies to the TCM when the vehicle is cold.

2. If OK, depending on ambient temperature. If ambient temperature is high and the problem will not show, remove the TCM and place it in a freezer for a couple of hours.
3. If the ambient temperature is low remove the TCM to a warm area for a couple of hours.
4. After sufficiently cold or warm, install the TCM and drive the vehicle immediately.
5. If the ambient temperature is low and the transmission now shifts or the ambient temperature is high and the transmission will not shift replace the TCM.

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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
  

P1693 - A companion DTC was set in both the ECM and PCM
P1694 - No CCd message from PCM - Aisin transmission
P1698 - No CCd message from TCM
I would check the connections from the new engine control. Are these codes that show up new or have they not been cleared from a previous problem. Be sure all codes are cleared, Hope this helps. Let me know. Thanks

The code 1698 is no communication from tcm (trany control module), this may be cause by a bad trany module computer or wiring to computer, more testing would need to be done before calling module bad,

this code point to diagnosing the TCM. This is prabably a computer issue.

Dodge: No CCD message from TCM or No Transmission Bus Messages

A P1698 code is described as PCM Fault, No CCD Messages from TCM Conditions. It's triggered when the key is on, and the PCM did not detect any CCD messages from the Transaxle Control Module (TCM) for 10 seconds. Time for a trip to the dealer unless you feel like inspecting the wires & connectors leading to/from the TCM. Usually I tell people to go to the dealer when there are TCM problems! They can read any codes stored in the TCM that a regular code reader can't get. Good luck.