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Discussion Starter · #141 · (Edited)
When the code P0606 is set in the Powertrain Computer, it means that the Powertrain Computer or PCM is failing its own self-check and has found problems with the CPU (central processing unit ). So, in most cases, the processor itself is defective and the PCM needs to replaced and re-programmed.

It stands for: P0302 is certainly a cause for concern, and can be a threat to the drivability the Dodge Ram. The nice thing about it is that the P0302 has tracked the problem to a particular cylinder, which makes diagnosing the problems simpler than P0300, which means that the cylinders are randomly misfiring.

Both codes are serious and could be expensive on either the 3.7 or 4.0 engines if they stand. I was going to suggest the battery as the first place to check if more than 3 years old.

Have you erased these codes and do they return? Did they start after you replaced the battery? Reset the Nitro computer by disconnecting the battery (again) for 5 minutes. Check out ALL connections to battery and PCM, inside and out. Make sure every thing inside the PCM is not loose.

As far as the PO302 error code, if it is not electrical it may be mechanical and require removal of the head.

I would recommend a trip to a Chrysler Dealer Service Department for an estimate as a second opinion.

If you have not visited our Threads below they may be helpful. Good Luck & let us know what you find.





Dodge Nitro: Engine Problems / Code Errors

Dodge Nitro TIPM: totally integrated power module

Dodge Nitro Misfire

















 

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Was hoping to fix today...starter hanging up...2010 nitro, new battery, error code P0606 HELP PLEASE!!!
Yes new battery and erased codes and they came back. Along with starter hanging up the radiator cap is under great deal of pressure even tho it has been sitting up for days now. When cap is off and turning key over water shoots out about 4 inches high even tho it doesn't start. I did notice faint smell of fuel on oil dip stick. But oil is not milky. Used wire from battery to alt and still won't start and used as ground still no start. Starter trying but still hanging. And smelled fuel this time while turning key over.
No wires visibly causation at first glance.
 

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Well Mzndependent, this is a current Update on my 2007 Dodge Nitro R/T 4.0 engine that had the same PO302 error code. I was waiting to see what the final resolve was and today I visited my Chrysler Dealership for an update. I took the Nitro in Dealership on 12/10 and was expecting to hear that the #2 cylinder had a fuel injector issue, coil or spark plug! Two day later I was told they had taken the left cylinder head off. Thought they would have found a bad valve seat, but no loss of compression or blown head gasket. Vehicle never over heated and no loss of oil or antifreeze.Then they were looking at a warped head? This Nitro has very low miles, too.Think they reinstalled it and still had the same problem. I suggested a bad cam, no everything else was O.K.

GOOD NEWS FOR ME BUT MAYBE NOT FOR YOU

Today I was told they had ordered a complete "Long Block" and that was covered by my 2007 Lifetime Powetrain Factory Warranty!

Still not sure what went wrong? Can a block be warped? Will know more later and the new / rebuilt Mopar engine will take about 10 days to arrive then will be installed.

Hopefully your issue is not the same.
I too hope that is not the case. You stated error 0302 my error was 0303 and 0606 both beginning w the "P". Also the car never over heated nor did water temp ever go above normal. I Kno that the pressure under radiator lid cause is under question. The only indication there was even a problem was the starter hanging which led me to buy the new battery and the code reader that gave me the two generic codes. I'm sure I'm just in denial hoping it's something much simpler but when I smelled the hint of fuel when my fingers cleared the oil dip stick is when I got the bad feeling. Unfortunately I have no way currently to get it to a mechanic from the very remote area I live in. When I do get it diagnosed I'll let forum Kno and not leave forum wondering results.
As of now I'm too sickened to investigate it any further n trying to weigh the loss n perhaps look into another vehicle as this one has over 200,000 miles on it and has never given me any trouble until now I feel I was lucky the 10 years I've owned it.
 

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Discussion Starter · #144 ·
I just forgot the PO in front of the code for #2 cylinder and yours would be for the #3 cylinder. Can't figure out Wife since she says she would never buy a Chrysler product if the engine won't last with such low miles! Will at least it is covered on a vehicle 12 years old! They did hit me up for maintenance on transfer case and auto transmission that are still covered plus brakes at over 1K, but hard to say NO when they are replacing the engine. I was shocked to hear that they had ordered a "Long Block" too. Really thought a replacement head would correct the issue. Hopefully things will work out for you! Good Luck.
 

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Well after all that yours shud b good for long time I swear mine was awesome never ever gave me any trouble n the 10 yrs I had it NONE and has about 217,000 miles on it.
I'd just say when it gets close to turning over to start looking for replacement bfor any thing happens like mine !
Good luck w ur new long block
 

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Discussion Starter · #146 · (Edited)
1. Dodge Nitro Engine Miss 4.0 Liter

ERROR CODES PO300
PO301-PO306


Jan 23, 2020

A bit of confusing scanning



Zurich
ZR11 OBD2 Code Reader with ABS
 

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Discussion Starter · #147 ·
3. Timing components removal Dodge Nitro 4.0 V6


Feb 23, 2020

Getting this thing torn down
 

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Discussion Starter · #148 · (Edited)
4. Dodge Nitro 4 liter misfire


Jan 20, 2020

The dead cylinder reveals it's problem. A broken camshaft.






5. Removing the head


•Feb 25, 2020


Easy day today removing the head
 

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Discussion Starter · #149 ·
6. Dodge Nitro quick update

•Feb 26, 2020


I stay pretty busy. Not just on working on cars but also with my regular job driving a truck. I wish I was able to make faster progress on this particular repair.
 

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Discussion Starter · #150 ·
7. Setting the Head in place


Feb 27, 2020

Every day do something and eventually it will be finished
 

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Discussion Starter · #151 ·
8. Dodge Nitro torquing the cylinder head bolts


Feb 28, 2020

These are some mighty tight head bolts.
 

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Discussion Starter · #152 ·
9. Dodge Nitro 4.0 Installing Timing Belt


Feb 29, 2020

In this video I am reinstalling the timing belt and components
 

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Discussion Starter · #153 ·
10. Dodge Nitro 4.0L valve cover install


Mar 1, 2020

I didn't get much done today but a little bit is more than nothing at all
 

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Discussion Starter · #154 ·
11. 2008 Dodge Nitro engine miss


Mar 3, 2020

I get it put back together only to find that it still has a miss. I will be taking it apart once again. never give up!
 

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Discussion Starter · #155 ·
12. 2008 Nitro Apart Again


Mar 5, 2020

I never give up. Hunting down the source of the engine miss, intake popping and hard starting. The engine gets taken apart again
 

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Discussion Starter · #156 · (Edited)
13 2008 Dodge Nitro engine miss


Mar 10, 2020

Considering options. Maybe a mix of the better parts is the way?
 

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Discussion Starter · #157 · (Edited)
14 Dodge Nitro 4.0 Wrap-up


May 7, 2020

I've never been so glad to be finished with a vehicle
 

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Discussion Starter · #158 ·
Dodge Nitro engine code retrieval without a scan tool !


Jun 28, 2020

2008 Dodge Nitro 3.7L engine code retrieval using only your key.
 

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Discussion Starter · #159 ·
2008 Dodge Nitro 3.7 P0202


Dec 7, 2020

Short video replacing cylinder 2 fuel injector
 

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Discussion Starter · #160 · (Edited)
Map Sensor cleaning or replacing 3.7 dodge nitro


Jan 25, 2021

If the MAP sensor goes bad, the ECM can't accurately calculate engine load, which means the air-fuel ratio will become either too rich (more fuel) or too lean (less fuel). ... This leads to excessive fuel consumption, poor fuel economy, and possibly detonation. Lack of Power.

7 Symptoms of a Broken MAP Sensor



By
Benjamin Jerew




Updated May 31, 2019

In modern engines, the engine control module (ECM) measures or calculates air flow via either a mass air flow (MAF) or manifold absolute pressure (MAP) sensor. Turbocharged engines may use both, but naturally-aspirated engines typically use one or the other. If the MAP sensor is failing or broken, the ECM — and thus, the engine — can't function properly. By maintaining and repairing your MAP sensor, you'll keep your engine running smoothly.

How a MAP Sensor Works
MAP sensor in a car engine highlighted in dark red.

This MAP sensor is mounted directly to the intake manifold, but others might be connected by a hose.

The ECM uses MAP sensor data to run crucial calculations, such as engine load, fuel injector pulse, and spark advance. When at rest, the MAP sensor reads atmospheric pressure at sea level (29.93 in. Hg). Because atmospheric pressure varies with weather and altitude, the ECM calculates this “zero” point just before the engine starts, fine-tuning spark and fuel injection mapping from that point.

When idling, intake pressure usually ranges from 16-22 in. Hg. Because this is lower than atmospheric pressure, air rushes into the intake. When the driver uses the engine to brake, pressure can go as low as 10 in. Hg. Upon accelerating, however, the open throttle body allows air to rush in faster, increasing pressure in the intake. At wide-open throttle, intake and atmospheric pressure are nearly equal.


Signs of a Broken MAP Sensor
Check engine light in a late-model car.

MAP sensor problems could trigger a DTC and check engine light.


MAP sensors fail by getting clogged, contaminated, or damaged. Sometimes, engine heat “overcooks” the MAP sensor's electronics or cracks vacuum lines. If the MAP sensor goes bad, the ECM can’t accurately calculate engine load, which means the air-fuel ratio will become either too rich (more fuel) or too lean (less fuel).

So, how will you know that your MAP sensor is going bad? Here are the key problems to look out for:
  1. Poor Fuel Economy. If the ECM is reading low or no vacuum, it assumes the engine is at high load, so it dumps in more fuel and advances spark timing. This leads to excessive fuel consumption, poor fuel economy, and possibly detonation.
  2. Lack of Power. If the ECM is reading high vacuum, it assumes the engine load is low, so it cuts fuel injection and retards spark timing. On the one hand, fuel consumption will go down, which seems like a good thing. However, if too little fuel is consumed, the engine may lack power for acceleration and passing.
  3. Failed Emissions Inspection. Because fuel injection doesn’t correspond to engine load, a broken MAP sensor can lead to an increase in harmful emissions. Excessive fuel generates higher hydrocarbon (HC) and carbon monoxide (CO) emissions, while insufficient fuel may lead to higher nitrogen oxide (NOx) emissions.
  4. Rough Idle. Insufficient fuel injection starves the engine for fuel, leading to rough idling and perhaps even random cylinder misfiring.
  5. Hard Starting. Similarly, an excessively rich or lean mix makes the engine hard to start. If you can only start the engine when your foot is on the accelerator, you probably have a MAP sensor problem.
  6. Hesitation or Stalling. When starting from a stop or trying a passing maneuver, stepping on the gas might not give you any joy, especially if the ECM is giving you a lean mixture based on faulty MAP sensor readings.
  7. Check Engine Light. Depending on the age of your vehicle, MAP sensor diagnostic trouble codes (DTC) may range from simple circuit, or sensor faults, to correlation, or range faults. A dead MAP sensor won’t read anything, while a failing MAP sensor might give the ECM data that makes no sense, such as low engine vacuum when the throttle position sensor (TPS) and crankshaft position sensor (CKP) both show the engine at idle.


MAP Sensor Problems
Bluetooth OBD2 scan tool.

A Bluetooth OBD2 scan tool is an inexpensive but powerful tool for diagnosing all kinds of engine problems, such as a failing map sensor.

A functional MAP sensor is a critical part of the maintenance of your vehicle. If you suspect that you may have a problem with your MAP sensor, check the following elements first.
  1. Electrical. Start by checking the connector and wiring. The connector should be securely connected, and the pins should be clean and straight. Corrosion or bent pins can cause MAP sensor signal problems. Similarly, the wiring between the ECM and MAP sensor should be intact. Chafing could cause short circuits, and breaks could cause open circuits.
  2. Hose. Some MAP sensors are connected to the intake manifold by a hose. Check that the MAP sensor hose is connected and intact. Also, check that the port is free of carbon deposits or other debris, which could block the hose and lead to poor MAP sensor readings.
  3. Sensor. If the sensor is connected properly, both electrically and to the intake manifold, use a scan tool or voltage meter and vacuum gun to check MAP sensor output. You’ll have to look up a chart to measure voltage against no vacuum and full vacuum. If MAP sensor output doesn’t match the chart, it’s safe to say the sensor should be replaced.








 
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