Sunday, January 27, 2013

2003 Chrysler Concorde Struggled to Accelerate

OBD Code P0700 on Chrysler

Check engine light ON and vehicle struggles to accelerate.

Also engine RPM goes high



I got the code by cycling the ignition key ON-OFF.
The procedure is on, off, on, off and then on


SOLUTION AND REASON FOR THESE PROBLEM:----




In your case the issue is in fact with the transmission instead of engine. What has happened is the transmission gone into limp-in mode, where it's restricted to second gear. For this reason it takes off sluggishly and engine RPM's are higher while driving a vehicle.

Now coming to the OBD error code which you got. P0700 sets in the engine controller when there's a fault code stored in the transmission control module.
On these case,
the first thing to be done is to diagnose the problem. These can be done once you  read the fault codes from the trans controller with a scan tool or code reader. Cycling the key will allow you to read codes from the engine controller only but not any of the other modules.
Most large parts stores like Autozone will read codes for free in the parking lot with a code reader.
Once you receive that codes you will get another OBD code for correcting the problem.



THE CUSTOMERS REPLY:-----

I received more error code when got my vehicle scanned at autozone the first code was similar which i manually retrieved by cycling ignition key but one more OBD code i received is P1776

THE EXPERTS REPLY:---





As mentioned previously
The P0700 just sets in the engine controller when there is a code stored in the trans controller. So just ignore Error code P0700.

The one related to the actual problem is the P1776.

The explanation for Error code P1776 :-----

P1776 sets because solenoid switch valve in the transmission valve body gets blocked in the low/reverse position or the transmission control module (TCM) does not get that solenoid switch valve is in correct position.


WHAT IS SOLENOID SWITCH VALVE?
The solenoid switch valve is a valve in the valve body that allows the same solenoid to be used to apply either the low/reverse clutch or the torque converter clutch. It moves backwards and forwards in a bore to direct fluid in either direction.


HOW EXACTLY TCM KNOWS THAT FLUID IS REQUIRED?
These is done by pressure switches.In the solenoid pack mounted on top the valve body there exists a series of pressure switches that tells the TCM when there is fluid pressure in the different hydraulic circuits.

When the P1776 sets it's because the low/reverse pressure switch has indicated fluid pressure on the low/reverse circuit when the torque converter clutch should have been turned on.


REASONS FOR THESE ERROR CODE TO OCCUR?

Here are a few possibilities that can cause this. It could be wiring or the TCM itself but that would be rare.

A solenoid switch valve sticking.
They can wear into the soft aluminum bore over time and start to stick and cause this code to set.

Another possibilities failed low/reverse pressure switch, and this is the most common cause for the code.

As I talked about before that the pressure switches are located in the solenoid pack, and they're serviced with the solenoid pack. There were many solenoid packs in this time frame that were identified as built with suspect pressure switches in them.

I suggest to replace the solenoid pack and while the valve body is out, without forget inspect the solenoid switch valve bore and polish it up if required. The solenoid pack is almost surely the cause of your problem but since the valve bore does wear a bit I always make sure it's in good condition before re-installing the valve body.

These details will help.
Thanks.



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