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Dodge Nitro P0108: MAP Barometric Sensor → High Input

December 18, 2019 by Jason



P0108 is a generic OBD-II trouble code. It indicates your Dodge Nitro’s MAP (manifold absolute pressure) sensor’s voltage reading is outside of the normal operating range. The voltage is too high. It’s most commonly caused by a bad MAP sensor, wiring issue, or vacuum leak.

The MAP sensor measures the air pressure coming into your Nitro’s engine and sends that signal to the ECM. It does this by sending a voltage ranging from 1 to 5 volts. 1 volt would be idle speed. The signal should be at 5 volts whenever the vehicle is at wide open throttle. P0108 is triggered whenever the signal from this wire is MORE THAN 5 volts, which shouldn’t happen.

P0108 can also trigger if the ECM thinks the voltage coming from the MAP sensor is higher than it should be at any given time.

Dodge Nitro P0108: MAP Barometric Sensor → High Input

December 18, 2019 by Jason



P0108 is a generic OBD-II trouble code. It indicates your Dodge Nitro’s MAP (manifold absolute pressure) sensor’s voltage reading is outside of the normal operating range. The voltage is too high. It’s most commonly caused by a bad MAP sensor, wiring issue, or vacuum leak.

The MAP sensor measures the air pressure coming into your Nitro’s engine and sends that signal to the ECM. It does this by sending a voltage ranging from 1 to 5 volts. 1 volt would be idle speed. The signal should be at 5 volts whenever the vehicle is at wide open throttle. P0108 is triggered whenever the signal from this wire is MORE THAN 5 volts, which shouldn’t happen.

P0108 can also trigger if the ECM thinks the voltage coming from the MAP sensor is higher than it should be at any given time.



P0108 Dodge Nitro


P0108 Quick Facts
  • P0108 is caused when there’s too much voltage coming from the MAP sensor to the ECM.
  • Most commonly caused by a bad MAP sensor. Vacuum or wiring issue are the next most common causes.
  • Usually results in a rough running vehicle.
  • A voltage meter is required to diagnose the MAP sensor.


P0108 Symptoms: Dodge Nitro
P0108 is always going to do more than just trigger the check engine light. The MAP sensor is vital to a well running vehicle. If it’s gone bad, it’ll really affect drivability.

Here are the most common symptoms of P0108:

  • Poor Gas Mileage
  • Rough Running/Stalling Engine
  • Motor Won’t Start at All
  • Black Exhaust Smoke
  • Check Engine Light



Dodge Nitro P0108 Diagnosis


Dodge Nitro P0108 Causes + Diagnosis
When diagnosing this code, if your Nitro is running fine you should first reset the code and take the vehicle out and try to reproduce the problem. It may have just been a one time thing.


Map Sensor
The first thing that you should do is test the MAP sensor itself. A good voltmeter is necessary for this step. You can get them pretty cheap from any hardware store or Amazon. The reading from the voltmeter should be around 1 to 1.5 volts at idle. If it’s higher, you may need a new MAP sensor.

Here’s a pretty good YouTube video that shows exactly how you would go about testing the sensor:

Map Sensor Testing





Vacuum Leak
A vacuum leak is a very common reason that P0108 is triggered. If there isn’t enough vacuum going to the MAP sensor it’ll give a higher voltage reading than the operating conditions suggest should be there.

The vacuum supply to the MAP sensor could have a leak, or there could be a vacuum leak around the engine as a whole. Check all the vacuum lines on the engine. Check to see if any of them appear to be brittle, melted or cracked. If they are, replace them and see if that solves the problem.

Another place that vacuum can leak from the intake manifold. Here’s a solid article from Popular Mechanics on how to track down a vacuum leak.


Wiring Issues
The easiest thing that you can do when P0108 is triggered is check your Nitro’s wiring harness. Is it plugged in to the MAP Sensor tightly? Does it have any visible signs of damage? Follow it as far as you can and make sure. It’s going to have a ground wire. Make sure that ground is plugged in tightly. Here’s a good video on how to find a short in a vehicle.


Other
While the three causes listed above are the most common reasons P0108 shows up, there are other reasons as well. If your Nitro’s motor is worn out and isn’t producing a good vacuum anymore, that’ll cause the MAP sensor to output a higher voltage at all times and throw the code.

It’s also possible that an engine that is misfiring or has low fuel pressure can trigger this code as well. It would need to be a pretty noticeable misfire. You should also get P0300 or P030X (X representing the cylinder number of the misfire) with P0108 if misfiring was the case.


Conclusion: P0108 Nitro
While it is most likely to be the MAP sensor itself that is causing P0108 in your Dodge Nitro, properly identifying the problem can save you from purchasing and installing a sensor that you don’t need If there is anything that you would like to add, please leave a comment below. Good luck!
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Discussion Starter · #164 · (Edited)
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Back in 2019 I had a engine error code PO302 on my 2007 Dodge Nitro R/T 4.0 engine and used
Chevron Techron Concentrate Plus Fuel System Cleaner - 20 oz. to correct this issue.

Well that same code reappeared unexpectedly now and this time I took to my Dealership since it missing so bad.

I was sure they would say it needed injectors replaced, or a coil pack and spark plugs or All three! A very expensive service repair.

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In all my years I have never seen such a great coupon for Dealer Service. Great Savings, very pleased.
 

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Discussion Starter · #174 ·
Evaporative Emission Control System (EVAP)
Blog / By Dan McClave



It is a great pleasure to take a closer look at EVAP; namely, Evaporative Emission Control System with you today.
Evap leak how to fix

Truthfully, many people do not realize how complicated their car is. Today’s cars contain several hundred systems and sensors that monitor everything from road conditions to engine performance and everything in between.
All these systems make it safer and easier for you to drive your car. That’s why it is important to maintain your car and take the necessary action when you are alerted to a problem. These systems are designed to ensure your safety and protect the environment at the same time. One of the systems designed to protect the environment is the Evaporative Emissions Control System or EVAP.
What is EVAP?
Most people learn about the EVAP system when they forget to replace or do not tighten the gas cap after refueling. The EVAP system with an aim to capture vapors in the fuel tank and prevent them from escaping into the environment.
Since it’s a completely closed system, any small leak will cause a fault resulting in the engine light coming on. You probably will not even notice a problem because a small leak won’t affect the way the car drives. About the only thing you will notice is the annoying glowing check engine light.
How does Evaporative Emissions Control System work?
Believe it or not, the fuel we burn contains over 100 chemicals which are very harmful to the environment. The reason to add these chemicals is to enable the fuel to burn more cleanly and pollute less. Gasoline vapors are very dangerous to humans and are one of the leading causes of smog and air pollution.
For this reason, car companies had to develop a system that would prevent these harmful vapors from polluting the environment. This Government mandate was implemented in the ’70s. It stated that the EVAP system must collect, store and dispose of gasoline vapors before they could impact the environment.
The typical system is simple in design but somewhat complex in operation. It includes a canister full of charcoal, several valves, lots of hoses and vents and of course the sealed gas cap. The system is closed so that any excess fuel vapors are collected and stored in the charcoal canister. These vapors will eventually be added to the normal fuel/air mixture and burned during combustion.
What are the components of EVAP?
There are several components that comprise the EVAP system. The main component is the gas tank which is where the vapors come from. There are sensors in the gas tank that measure both the amount of fuel and the tank pressure.
On newer cars, the gas tank may also include the fuel pump, filter and pressure regulator as manufacturers like to group these components together. The gas tank also uses a sealed gas cap which is where 99% of the leaks come from.
From the gas tank, the fuel vapors are vented to the charcoal canister where they are stored. The canister is basically a big lump of charcoal that absorbs the vapors and prevents them from escaping into the atmosphere. The computer controls the canister purge valve which enables the stored vapors to be added to the normal air/fuel mixture. There is also a canister vent valve that prevents outside air from entering the system during testing.
As you can see the system is not overly complex, but all valves and sensors must work perfectly so that the computer can control the process. Any small leak or failed sensor will generate a problem and in turn, will illuminate the check engine light.
What are common problem related to EVAP?
Since the EVAP system is a closed system, any small leak or failed sensor will generate a system fault. Obviously, the indication that there is a problem will start with the check engine light.
You typically will not notice any change in the performance of the car due to an EVAP leak. Let’s look at some symptoms, fault codes, fixes and things that you can do to prevent problems.
Symptoms of bad evap or evap leak?
  • Check engine light is on
  • Fuel odor
  • Rough engine idle
  • Stalling
  • Poor gas mileage
  • Hesitation when accelerating
Common obd2 fault codes related to evap
If the check engine light illuminates you won’t know if it’s the EVAP system or something else until you identify the fault code. To get that code you can go to an auto parts store or take your car into the dealer.
Some of the common fault codes associated with the EVAP system are as follows:
  • P0440 code means that a leak has been detected or the vapor pressure sensor in the fuel tank has malfunctioned. One indication might be a faint odor of gasoline originating from the gas tank.
  • P0445 code means that the EVAP purge valve is malfunctioning by either being stuck open/closed or has shorted out. Some of the symptoms of this problem are fuel odor, rough engine idle, hesitation or stalling.
  • P0449 code means that the EVAP vent control valve is malfunctioning due to an electrical issue (high resistance) or mechanical issue (sticking valve). One obvious symptom may be a noticeable fuel odor but usually no change in car performance.
  • P0455 code means that there is a huge leak in the system. There may be a noticeable odor but usually no performance issues. When this error code is triggered it usually means that there is a large hole somewhere. Something like a hole in the canister or a missing gas cap would be good examples.
  • P0441 code means that the computer has detected that the flow through the purge valve is incorrect. Again, this could be due to faulty hoses or an electrical connection to the purge valve. It could even be caused by a faulty vacuum switch, so all possibilities need to be considered.
  • P0442 code means that there is a small leak in the EVAP system. The gas cap is usually the culprit but a pinhole in a hose or a loose-fitting hose could also cause this. One symptom of this type of leak might be reduced gas mileage.
  • P0446 code means that the computer has detected a short in the vent control valve circuit. A symptom of this type of leak is reduced gas mileage.
  • P0440 code means that a vapor pressure sensor has malfunctioned or there is a leak in the fuel tank vapor system. A common problem is a leak in the fuel tank vapor lines or a loose gas cap. You may also notice a fuel smell if the leak is large enough.
  • P0452 code means that the computer has detected a voltage issue with the EVAP system. The measured voltage must be with a certain range or else system components could be affected. The major component that would be affected by low voltage is the fuel tank pressure sensor.
How to fix an EVAP leak?
As far as we know, EVAP leaks are usually identified by a computer error code. The truth is any car code reader can reveal those codes. Unfortunately, the error code may point you in the right direction but will not usually pinpoint the exact problem. To find and fix the source of the problem requires a process of elimination. In some cases, an accident will damage one of the components of the EVAP system. This type of damage may not appear right away but may take some time to show itself. Finding and fixing an EVAP system leak often involves patience and experience by a trained technician.
Causes may lead to EVAP Leaks
Some of the problems that will cause an EVAP system problem include the following:
  • Loose-fitting, wrong or missing gas cap
  • A leak in the charcoal canister
  • A leak in any of the hoses that interconnect the system components
  • The leak in the fuel tank
  • Sticking purge valve or vent valve
Evap
Check the gas cap if it’s loosed. Recommendation of what to do with EVAP leak: EVAP maintenance tips
Due to the design of the system, eliminating every source of leaks is a daunting task. As we have pointed out, the gas cap is the cause of 99% of the problems. Many people do not realize the importance of this simple component. Just making sure it is right and tight will go a long way to keeping the system operating correctly.
Obviously, components will fail over time so ensuring that your car is maintained on a regular basis is important. For example, at your next oil change ask the Technician to do a visual inspection of the EVAP system. They may spot a cracked hose or crack in the canister that can easily be fixed on the spot.
Bottom line
As with any system in your car the EVAP system has an important job to do, protecting the environment. If you look at the systems and processes that make up the design of your car, you will see that most are focused on protecting the environment.
From the moment fuel enters the tank until it is burned and discharged into the environment, your car is in control. For this reason alone, it is important to maintain your car’s systems and not ignore any warning signs of a problem.
We are all in this together and we need to do out part to protect the environment, one car at a time.
 

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Discussion Starter · #175 ·
2005ish to 2012 CHRYSLER DODGE JEEP RAM PO456 DIAGNOSIS


Sep 23, 2022 REMEMBER THAT THE EVAP SMOKE AND AIR TESTERS CAN NOT ACTUALLY TEST THE EVAP SYSTEM UNDER THE SAME CONDITIONS THE PCM TESTS THE VEHICLES EVAP SYSTEM . THIS IS A GOOD EXAMPLE OF THAT . THIS IS A VERY INTERMITTENT EVAP SMALL LEAK ON A DODGE NITRO . ALSO THESE DIAGNOSTICS STEPS CAN BE USEFUL TO TECHS . ENJOY AND SEEK A PROFESSIONAL AS NEEDED . DONT ASSUME THIS IS YOUR CARS ISSUE .also want to state the ball should be close to the actual bottom or at the bottom of indicator tube on EELD tester after 5 minutes but wanted to show in this video where pass fail line was according to trouble chart .
 

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Discussion Starter · #176 ·
2009 Dodge Nitro Transmission Shifting Harsh. Code P0896

2009 Dodge Nitro Transmission Shifting Harsh. Code P0896 - YouTube

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