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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1997 jetta lacks power

Runs rough, stalls,no power,
While in 1st gear, while driving, no power-car dies; Starts up every time;


Is there steady check engine light coming up on dash.

If YES.
Then get the vehicle scanned to retrieve error codes.

Other possibility for these problems:----


Such problems are  caused due to simple build-up of gunk in the throttle body. Try removing the throttle body and cleaning it thoroughly, with carb cleaner or something similar. Just cleaning the front usually doesn't do the trick. You want to make it shiny clean, looking like new inside, front and back. When you're done and have re-installed it, you should do a "Throttle Adaptation"

When you are doing this, disconnect the battery for about 5 minuets. Be sure to clean behind the throttle plate.
Properly check for oil in the intake hose from the air mass meter if present the clean the air mass meter and hose.
If these do not work then you may need to replace the throttle body assembly.


OTHER POSSIBILITIES FOR SUCH PROBLEMS:-----


It can be air or a vacuum leak. This is very common.
To confirm these problem simple test !

Open the hood and listen for a hissing sound when the engine is running.

Actually what happens is ...................
Un-metered air can enter the engine through a vacuum leak, a dirty airflow sensor that is not reading airflow accurately, an EGR valve is not closing and is leaking exhaust into the intake manifold, an EGR valve that is allowing too much flow.
If it is hard to pinpoint, then another easy but little bit risky method to confirm the issue ..............

take some brake cleaner or starting fluid around the intake manifold and vacuum lines and see if the engine stumbles or if the idle is affected. Be extremely careful when doing this!

As previously mentioned the issue indicates problem with throttle body
Also, carbon layer gor collected on throttle body and need to be cleaned! This can cause all sorts of idle and hesitation problems. This is caused by the throttle plate not seating properly.
So on these case,at our auto garage ,the First thing i would do is clean out the throttle body with some throttle plate and intake cleaner and a small brush.
Another common cause would be the Idle Air Control motor. This is very common on older cars. The IAC motor gets dull/loose and cant keep up with the fast idle changes. Also when the IAC motor is out, I rec to check the passages for carbon build up. If they are plugged they need to be cleaned out.

Check for the following conditions:
These will pinpoint you towards the problem:-------------------

• Poor connection at PCM or IAC motor: To confirm these case ,inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection. 
• Damaged harness: To confirm these case,inspect the wiring harness for damage. 

• Restricted air intake system: To confirm these case,Properly check for a possible collapsed air intake duct, restricted air filter element, or foreign objects blocking the air intake system. 
• Throttle body: To confirm these case.You need to check for objects blocking the IAC passage or throttle bore, excessive deposits in the IAC passage and on the IAC pintle, and excessive deposits in the throttle bore and on the throttle plate. Check for a sticking throttle plate. Also inspect the IAC passage for deposits or objects which will not allow the IAC pintle to fully extend. First always try cleaning the valve and sensors.f its not helping,then only you need to replace the parts.
• Vacuum leak: To confirm these case.You need to check for a condition that causes a vacuum leak, such as disconnected or damaged hoses, leaks at EGR valve and EGR pipe to intake manifold, leaks at throttle body, faulty or incorrectly installed PCV valve, leaks at intake manifold brake booster hose disconnected, oil filler cap, oil level indicator loose or missing, etc..

If you go for replacing parts,please replace old faulty parts by branded parts.Branded parts give accurate performance and last long.

 At our Auto garage for same problem lack of power problem with my TDI--1997 Jetta. It turned out to be the intake plugged with carbon. 

It can also be a possibility of faulty MAF sensor.


To confirm these ...................pull the plug on your MAF see if it'll rev to 5000rpm.

If RPM gets better without MAF,then its most possibly faulty MAF.

These details will help.
Thanks.

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OBD codes P1521 and P0750

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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Loss of acceleration?

This is most often caused by a faulty coil, but can also be caused by the catalytic converter plugging up or the timing being off.
You can check the wires and coils by spraying some water on them with the engine running. If they are leaking spark, you will see it arcing and can change the faulty part.


With the engine running, take a spray bottle with some water in it and spray the ignition coils and spark plug wires. These are sealed and the water should not affect them. If it does, you will see the spark that should be going to the spark plugs,jump out and spark to the engine. This is called spark arcing or leaking. The water makes it easier for the spark to jump. The coils and wires are right on the top of the engine. There may be a cover that has to be removed to access them.

It is possible that the plugs are bad, just more common for the coil or wire to be the problem.

Coils are about $90 each, so not overly expensive.
If it is the timing belt, then that would be in the $350-$400 price range to replace.
The converter will be up to $500-$600 to repair.

Also one more possibility can be faulty fuel pump,

check the fuel pressure.

This could be a lack of  fuel pressure from the  pump at the tank.

If the connections to this are corroded or damaged then the pump could stop at any time or could not be running at full speed. Check that its relay switches in and out and the relay contacts are clean and bright – replace the relay if in any doubt and do the same for the fuse,
Ideally measure the pressure at the inlet to the main engine fuel pump and if this is low check the pump as described and also consider changing the fuel filter as if this partially blocked this too will reduce pressure.

If both of these are OK then also check the connections to the EGR valve, if either the vacuum pipe of electrical connection are damaged / corroded then the EGR can be on all time which certainly will hurt performance. Its also possible that its a fault with the EGR valve so its worth removing the valve and cleaning it out with brake cleaner, if it looks particularly clogged then replace it.

If this is OK then check the small vacuum lines for vacuum leak or vacuum hoses loose or cracked.

Getting this possibilities checked will help.

Thanks.

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