Engine/Transmission (1998.5 - 2002) change map still have p0237 code

[iamjmg]

engine threw a p0237 code so I change the turbo boost sensor (map) sensor. still have the code. Relpaced with sensor I purchased from local dodge dealer with the new harness, so I just payed for the dealers vacation . rechecked all of the connections and they seem fine.



2001 quad cab, auto no mods. 50000 miles

 

[BDaugherty]

Did you clear the code after correcting the problem? If you didn't, it takes a lot of on/off cycles (I can't remember how many) for codes to go away.

 

[Bob4x4]

A code does not always mean a failed part. It is a low voltage code so you need to ck it out sometimes not just throw part at it

 

[iamjmg]

it would not delete with the obdii reader. haven't driven it for a couple of days , will try to drive it sometime today. what would give it low voltage? and how do you check it?

 

[Bob4x4]

You are going to need to ck it the old fashion way... ... ... . DVOM and wiring diagrams

 

[ToolManTimTaylor]

You are going to need to ck it the old fashion way... ... ... . DVOM and wiring diagrams

Yeah but before grabbing a Digital Volt Ohm Meter, MANY trucks that throw low voltage codes from various sensors do so because of a poor ENGINE ground. follow the ground lead from the passenger battry to the engine block. clean it up if it looks like a piece of wreckage from the Titanic. Next double check the shassis grounds that lead from the drivers side battery.



It's the next cost effective step you can take (Meaning FREE) that assures there is a good flow of voltage that is not hampered in any way. After all that clean up the battery terminals and see what happens. Theese trucks use some oddball LOW voltages on various circuits (I. E APPS sensor) and any added resistance can ruin your day.

 

[iamjmg]

Ok, removed the cables and clean the ends, cables looked good , reinstalled but still shows the code. Truck has low power and have just replaced the vp44 and lift pump when this whole thing started. only code showing is the p0237, and lift pressure is good.

 

[ToolManTimTaylor]

Bummer, Some times that does fix it and it is a money and frustration saver. When you say low power ... . when? Is it low when starting from a stop, on the highway, is it mimicing a trans slipping kind of feel? (Going twards Torque Converter not locking and second gear startoff)



Another thing to look at is when you changed your lift pump did alot of fuel spill down the side of the engine block from bleeding? There have been a few instances where after changing a fuel filter, fuel that was spilled down the side had migrated into the ECM connector pinouts. The fuel (Or water from washing) had made its way into the connector and created resistance and have also made an alternative current path. That can show hard starting and sluggish performance as the Accellerator Position Sensor gets a mixed signal.

 

[iamjmg]

well, I had a fuel line going to no. 2 cyl. that I left loose and made a big mess to clean up. the eng. thew the infamous p0216 code at the sametime it threw the 237 so I change the vp44 and lift pump, and those codes dropped right away. It's low on power all the time won't hardly go up a hill. I thought the vp44 change would fix that but it didn't and I still have the 237 code.

 

[iamjmg]

filally got a chance to check voltage. checked power since that seems to be the code :low voltage line A:. Power was 4. 75 volts, is that to low or is it within range.

 

[JLandry]

filally got a chance to check voltage. checked power since that seems to be the code :low voltage line A:. Power was 4. 75 volts, is that to low or is it within range.

According to the Dodge Diagnostic Procedures Manual, that appears that's within the acceptable range.



I've attached a copy of the P0237 Diagnostic Procedures and the Boost Pressure Test from the Service Manual. Follow the diagnostic procedure carefully and maybe something will show up. Whenever it says to check the MAP sensor voltage with a DRBIII, you can do the same thing with a multimeter... it's just less convenient than plugging a DRBIII into the OBDII port in the cab.



Worst case it's possible the ECM is malfunctioning.



Best of luck to you,



John L.

 

[iamjmg]

Thanks John for the troubleshooting help. Well after useing the chart and getting good readings from the MAP, and starting the ECM may have taken a dump, I removed the extra harness that the Dodge dealer sold me with the new MAP and plugged in just the old Harness to the new MAP and GOODBYE LIGHT. Checked the New harness and had what I thought was alot of restance in the output side of the 3 pin connector, takeing it back to dealer tomorrow since I don't need it anyway and it seems bad. Again thanks John I don't think I would have figured this out without your help. Truck has full power and all codes are gone.

 

[JLandry]

I removed the extra harness that the Dodge dealer sold me with the new MAP and plugged in just the old Harness to the new MAP and GOODBYE LIGHT.

You're welcome for the help.



Just so I'm clear on what happened...



Was the original MAP sensor (which I believe you said you replaced) the root cause of the problem, and the defective new wiring harness from the dealer which you installed added a new problem?



Best regards,



John L.

 

[iamjmg]

yea, when the cel first came on I had a p0237,0216 codes. changed the map right away, and when I bought the new one the dealer said I needed the new harness, which I also installed with the new MAP. After the vp44 and lift pump change the 0216 code dropped but not the 0237. no matter what I tried the code would not clear, until now. I understand that the 2002's need this new harness, i guess I've just learned a lesson on buying parts from the dealer. Again thanks for the help



Jim G