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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Poor Acceleration problem on 2006 Dodge Ram and check engine light came on.Also shifting issues noticed.
Scan test shows error code P1521 and P0750.

Is Poor Acceleration related to this error codes?
What exactly Obd error code P1521 and P0750 indicates?

Yes this error codes are related to your problem.

The error code P1521 is for incorrect engine oil type. May be you have recently got the oil replaced and refilled it with wrong oil type.Or the previously replaced oil is not got very thick and dirty.If its the case then inspect the oil condition and type and replace it with proper suggested oil as per owners manual.
The engine computer controller monitors oil pressure versus temperature to determine if the correct oil is being used, this code sets when the incorrect viscosity is detected. You may have the wrong oil in it, a thick oil additive will set the code also. As per dealer and owners manual dodge ram truck requires 5w20 and no additives or this code will set.


Now the other code which you got is P0750.
This obd error code is for the low/reverse solenoid in the solenoid pack inside the trans.The low reverse solenoid needs to be inspected. This code sets when the voltage on the circuit is incorrect for a given state. With this code set the trans is going to be in limp-in, either third gear only or third and fourth.

And due to this both error codes.
One the oil quality related and other the transmission shifting related,you will notice poor acceleration.

WHAT POSSIBILITIES TO BE CHECKED FOR P0750 ERROR CODE?

• The solenoid has to be inspected.The solenoid shorts due to various reasons.It could be an open circuit, short to power or ground on the low/reverse solenoid driver wire anywhere between the powertrain control module and the trans.
• On some cases it was noticed hat PCM ( power train control module) was faulty.So it could also be the powertrain control module itself. A wiring problem or the module are certainly possible but not common.
• Or it can be connection issue at the large connector on the left side of the trans, but again that's not common.

OK,OUT OF THIS 3 POSSIBILITIES WHAT IS MOST COMMON?

The most common cause of a solenoid code is a failed solenoid, requiring solenoid pack replacement. The solenoid pack is mounted to the top of the valve body in the trans. Most likely your solenoid pack will need to be replaced to repair this concern.

So in your case first inspect oil quality and next inspect low/reverse solenoid located in transmission on top of the valve body.

This details will help.
Thanks.

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vehicle lags when accelerating

You should know that while those problems can be caused by several issues, including low quality or altered fuel or even a loosely tighten fuel cap, the most common cause is a dirty MAF flow meter sensor.

The MAF sensor (Mass Air Flow Meter Sensor) is in charge of detecting how much air (in mass, not volume) is coming in to the engine, so the ecm computer can calculate the amount of fuel to be injected.

Some times this sensor gets contaminated by lots of microscopic debris that scape the air filter and accumulate on its sensing parts over time. The resulting effect is that the MAF flow meter sensor gets less “sensible” and detects less air than it is currently entering the engine. The reaction of the ecm computer will be to inject less fuel to keep the air fuel balance, taking as reference the false reading of the MAF flow meter sensor. This will produce a too-lean mixture, which is responsible of the hesitation, the loss in power and acceleration problem.

Before going to an auto parts store or to a mechanic to fix the problem, you should try fixing it your self. If the problem is a dirty MAF flow meter sensor, the solution is to clean it, plain and simple.But if cleaning sensor is not helping, then replace it.----------

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