P0201 & P0202 Injector Malf. Help Needed

[Chalo]

Alright well I went outside to start up the truck this morning and I noticed that it was idling rich & rough. I go ahead and scan it because it's thorwing the CEL and the codes come up as P0201 & P0202 (injector open or circuit malfunction in both cylinder 1 & 2). So I started off by checking all the plugins and made sure none of the wires had grounded out, turns out that all checked out good. Next step I decided to go ahead and replace those two injectors. I replaced both and it's still throwing the two codes and it's still idling rich and rough. Anybody have any advice or experienced this problem on their trucks ? I'm pretty much at a loss of where to look next to fix the problem.

[cyrjm]

Mine turned out to be a bad injector but would only do it when it's hot OUTSIDE...not necessarily the engine. Went all winter with it not throwing the code...do you hear any kind of ticking sound?

[headdunce]

Did you ever figure out what the problem was? I have the same problem right now on my truck...

Thanks

[carvster1]

Headdunce i had a similar problem but in my case it was throwing a 207 and 208 code and it turned out to be the TPS.

[headdunce]

Thanks, I took it into the shop this morning...

[headdunce]

Ha, the shop called, they don't know what's wrong with it either --- it seems to run fine, just throws those codes sometimes...??

[carvster1]

sounds similar to what i had. i kept getting the codes but did not really experience problems until several months later when i started feeling a difference in idle. it got so bad that i thought the truck might stall on me!! Liek i said i drove with the problem and just cleared the codes for a few months. when i changed the TPS (i could not prove it was bad but i followed someones advice on here) and the problem has not come back and i also noticed that the trucks runs a smoother idle. i guess i had gotten so used a rougher idle but it was not unitl switch the bad component that i noticed a difference.

I am by far not an expert but if you do not experience a problem you might be ableto drive the truck for a certain amount of time until it gets worse. I do not know how often you get the codes. (at first i could go a week or two before getting the code again) but you could always buy a tps try it and if it does not make a difference just take it back.(just make sure you do not get it dirty) it should be about 45 bucks

[headdunce]

Thanks - for the $45 I might as well give it a shot. It'll cost me more to have the shop poke around under the hood, and they already told me they aren't sure what the problem is either.

[txlen]

Also pull the connectors off the PCM, look to see if any of the pins inside are pushed back any...

[VonTedwig]

Thanks to all the previous posters, you provided great hints! To anyone with P020x trouble codes, this seems to be a theme that’s repeated by those posting here.

My situation:
P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208; all with MOD$D1. Yup, every cylinder had a trouble code for open circuit on the injectors. This made me think the TPS would be unlikely, even after reading posts… Even so, it seemed like an odd situation, every cylinder was showing the same problem and the TPS sensor is easy and cheap to replace. Prior to replacing the sensor the engine would run rough, the RPM gauge would fluctuate, bouncing around 500 +-. This was on my 2000 Durango, 150K miles, 4.7l v8…

Following everyone’s advice, replaced the TPS sensor and the problem has cleared. The check engine light turned off on its own, even before clearing codes. The engine is now running normally, RPMs appear to be constant and not bouncing irregularly.

My guess for why this trouble code was triggered: If the TPS reported widely differing throttle positions it might somehow tell the computer to push a bunch of fuel, then, as the injector is providing the fuel, tell the injector to shut off, all within a single duty cycle. That’s a WAG (wild xxx guess) but that’s all I can think of. It still seems odd to me that the TPS sensor would create trouble codes on the injector circuit, but it certainly was the situation I had.

Thanks again to all of the great advice, thought I should share so others with the same problem can be easily fixed.

[buzzbass]

Originally Posted by Chalo

Alright well I went outside to start up the truck this morning and I noticed that it was idling rich & rough. I go ahead and scan it because it's thorwing the CEL and the codes come up as P0201 & P0202 (injector open or circuit malfunction in both cylinder 1 & 2). So I started off by checking all the plugins and made sure none of the wires had grounded out, turns out that all checked out good. Next step I decided to go ahead and replace those two injectors. I replaced both and it's still throwing the two codes and it's still idling rich and rough. Anybody have any advice or experienced this problem on their trucks ? I'm pretty much at a loss of where to look next to fix the problem.

What has changed recently, have you done any mods or repairs ?

[VonTedwig]

As a side note, I ohm-ed out the TPS pot (potentiometer). It was not smooth as it was moved through its range of motion and it even appeared open at one point. My check engine light has been out for almost a week without resetting any of the previous codes. I am still a bit boggled as to why the TPS sensor would trigger the trouble codes for injectors, but, if you’re getting those trouble codes it’s probably worth the 40 bucks to replace the TPS sensor. I purchased my replacement at CarQuest auto parts store; half the price of the OEM dealership part.

[Malletman1]

Hey guys (and Gals), just wanted to shout out a HUGE thank you! After my truck started revving up and down and doing the "lunge" thing, I searched the net thinking a service center and $500+ being thrown at this thing was in my near future, I happened upon your forum here. Thanks to you guys, I just spent $42.00 at a local auto parts store and fixed my 2000 Dakota Q/C with 98000 miles on it by replacing the TPS. The rough idling had been occurring for about 2 months now, but I guess after getting p0202 AND 0207 showing up, it finally decided to give me a check engine light. Got the codes, found you guys, and after 5 minutes, 2 screws, and a test run....I'm a happy camper.

Seriously folks, Thanks a BUNCH!

Chad

[Spridget]

After performing a tune up and correcting some other fault codes (dry rotted emissions tubes under the bed), I noticed my truck wasn't running as smoothly as I expected it to. I checked codes again and found two new ones... P0201 and P0202.

I checked here for tips and found this post. I never would have guessed the TPS sensor, but I changed it anyway based on the recommendations from this post. The truck is running smoother. Part cost $36 and took 2 minutes to change.

Thanks!!!

[carvster1]

Well it is good to know this has helped some folks...


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