Topic: Pulled Strange Code today P2261?

[Gentleman Jack]

Ok, So I pulled a strange code today pulling on to the freeway today -

a P0101 (normal) with another pending
and

a P2261  (yes, I typed that right)

I searched, but the closest I can is a P0261 - Cylinder 1 Injector Circuit Low

It happened pulling on the freeway (accelerating hard) and then had to let off completely.  Popped both codes, or at least the check engine light came on then.

Any ideas what the P2261 might be?  The scanner tool I have said it was an "undefined" or "unknown"  I can't remember which, but it didn't know.

Thanks,
GJ

[2kwk4u]

Is this when I use that "lmgtfy" link?

http://www.lmgtfy.com/?q=P2261+DTC+LNF

[Critterman]

Don't worry about it BG it's a Cobalt code.

Scott,
Some day you will have to show me how you do that!

[Gentleman Jack]

Yeah yeah... I know. 

I did research it and couldn't find anything Kappa specific.  Is it fair to assume that the code for the Cobalt will be the same for us?  I know for the most part the codes are standardized, but want to be sure.  It stated it as an intermitent problem, so I guess I wait to see if it comes back?

The 2261 code does not appear on the DTC explained thread on this forum either.  I thought the people here knew EVERYTHING?  I will have to start telling all the new members that we don't know everything.  Dang, that was my selling point all this time.  I'll need a new slogan.

GJ
PS- tfg(ing)tfm.

[scanner]

Search out a DTC at:
http://www.aboutautomobile.com/DTC/

Your DTC is here
http://www.aboutautomobile.com/DTC/P2261

P2261 Turbocharger Bypass Valve - Mechanical

This means the ECM thinks the bypass valve is not moving properly, if there was an electrical fault there would be a different DTC.  Let us know if you can't find the problem with visual inspection.

[DeepBlueGXP]

Would an upgraded spring help resolve that issue?

[Sol Asylum]

Search out a DTC at:
http://www.aboutautomobile.com/DTC/

Your DTC is here
http://www.aboutautomobile.com/DTC/P2261

P2261 Turbocharger Bypass Valve - Mechanical

This means the ECM thinks the bypass valve is not moving properly, if there was an electrical fault there would be a different DTC.  Let us know if you can't find the problem with visual inspection.

After a drink or four GJ/BG has no problems seeing the two or three waste gates he just needs to know which one to inspect.    And now everyone knows how he first discovered the womand referenced elsewhere.

[Gentleman Jack]

This means the ECM thinks the bypass valve is not moving properly, if there was an electrical fault there would be a different DTC.  Let us know if you can't find the problem with visual inspection.

Visual inspection?  What would I be inspecting?  The bypass valve itself?  What should it look like?  Is it obvious to see if the spring is sticking?  Like a stuck thermostat?

GJ

[scanner]

The P2261 on board diagnostic test runs when the throttle closes suddenly after WOT. The ECM uses boost and MAP pressure sensors to detect improper control of the bypass. The charge air bypass valve gets engine vacuum from the intake manifold through a control solenoid and a line that runs from the intake manifold along the back of the head and up to the side of the turbo where it attaches to the charge air bypass valve. Any vacuum leaks will cause trouble. Look for loose fitting hoses or cracks.  Restricted exhaust will cause problems too, but you should have other complaints if that is the case.

If you have a scan tool you can see what the ECM sees for Boost and MAP pressures which are used in the OBD. The scan tool can also cycle the control and you can watch the pressure changes with bypass controlled by the scan tool. These are called output controls and require a good scan tool like the dealer's Tech2. Never under estimate of power of telling an ECM what to do for the purpose of non intrusive diagnostics. You don't even have to lift the hood to see what is happening.  Sorry I digress. 

You can also run a WOT snap in neutral and listen to the turbo as the engine winds down.  Pressure pulsations are normally dampened by the charge air bypass control system. A system that is not in control may be noisy as the valve cycles with the exhaust pulsations.

Else, find a good technician and watch him or her diagnose and repair.  I guess that would be a good visual...

[Gentleman Jack]

Scanner et al,

Thanks for the great info!  I have not had a chance to drive it again, but I the misses had it out today and had no issues.  I will dry a WOT drop again and see if it comes back and try the neutral snap and listen as well.  Might have been a one off, but only time will tell. 

Man, Scanner really make me want to buy a Tech II, so many possibilities...  not going to happen though. 

GJ

[Arabas]

BG, if under warranty, why not change the bypass valve with a new one (OEM) ?

[Gentleman Jack]

BG, if under warranty, why not change the bypass valve with a new one (OEM) ?

Code only came up with tuned ECM.  Would need it to show on stock ECM to have warranty work.  I think it is related to the tune.  I will investigate what the valve costs to replace and how hard it would be.  Might be an easy fix ?

GJ

[deepwater805]

Ok, I've got a weird one. Dunno what code it is, but the last time I drove the Ghost the boost gauge would go dark when pulling off the line, and well into second gear. Then come back bright after I hit third gear. I like to see what the boost is, so I watch it quite often. It did it several times, so I'm guessing I've got some kind of an issue. Has anyone else seen anything like this?

[Arabas]

when i tuned my previous car, the bov soon went south, so i had to replace it with a new one. techician told me that i could get the OEM but it would live a short life, so he directed me towards the Audi S4 OEM bov (almost same price).
i don't know if this could be a similar situation, but if you try the spring mode and it doesn t fix it, maybe an option would be to replace the bypass valve with a new one (OEM). what tune do you have?

Deepwater, what do you mean went dark?
when hitting over 1,75 kpa (the limit that the ECU reads) then for a while it shows no boost, but there is actually a loooooooooot of boost. is this the case?

[deepwater805]

Deepwater, what do you mean went dark?
when hitting over 1,75 kpa (the limit that the ECU reads) then for a while it shows no boost, but there is actually a loooooooooot of boost. is this the case?


The brightness goes very dim, then when I hit third gear it becomes bright again. I usually top out about 22 to 23 psi with the BSR tune. But this doesn't seem to be a boost problem, but a dash board problem.

[Sol Asylum]

All that acceleration makes it hard for the electrons to get to the display?  Try straightening out the wire harness so that it's easier for the 0's to get through the corners where there might be a sharp bend.
Uh is this really needed?

[Gentleman Jack]

Would an upgraded spring help resolve that issue?

DBG,
What spring?  A BOV replacement spring? Or replace the whole BOV?

GJ

[scanner]

Save your spring money for now. Check the hose runs and connections.

Also, I forgot to tell you all. OBD has the feature that if a diagnostic fails and turns on the service engine soon lamp that same diagnostic will cancel its lamp request if the diagnostic passes three consecutive tests. Some diagnostics run each ignition cycle, many do not so don't get caught up in three drives means three tests. It may not, reference past discussions on the OBD drive cycle and P0420. In any case always check for obvious issues, correct them if you can and the system will test for you.  If the correction is in, the lamp goes out and all the history is saved by the ECM.  Clearing DTCs destroys the historical information that the ECM saved to help a good technician with a good scan tool.   

[Gentleman Jack]

Save your spring money for now. Check the hose runs and connections.

Also, I forgot to tell you all. OBD has the feature that if a diagnostic fails and turns on the service engine soon lamp that same diagnostic will cancel its lamp request if the diagnostic passes three consecutive tests. Some diagnostics run each ignition cycle, many do not so don't get caught up in three drives means three tests. It may not, reference past discussions on the OBD drive cycle and P0420. In any case always check for obvious issues, correct them if you can and the system will test for you.  If the correction is in, the lamp goes out and all the history is saved by the ECM.  Clearing DTCs destroys the historical information that the ECM saved to help a good technician with a good scan tool.   

I will be on hose patrol as soon as I can get some day light to myself.  Have not seen the code again, so perhaps an isolated incident and the computer has found no more issue?

Scanner- great info.  Keep it flowing.  Thanks
GJ

[Kelu]

Looks like my gremling landed too far as I expected, I do have a heavy foot. I thought he will land on the east coast, I don't mind you received and offered him your Kappa as his place. 

[scanner]

This DTC requires two consecutive failures to request the lamp. One pass effectively cancels a pending lamp request. This type is known as type B.

[Gentleman Jack]

Well, Kelu's Gremlin may really have jumped the Ocean.  I pulled another strange code this Moday on the way to Honor Memorial Day.  P2273.  Going to research now...

GJ

EDIT:

O2 Sensor Signal Biased/Stuck Rich Bank 2 Sensor 2

Ok, so here is my code train:

P0101- MAF performance issue- (this one is repetative)
P2261- Turbocharger Bypass Valve
P2273- O2 Sensor signal biased/ stuck rich bank 2 sensor 2

Do these things have anything to do with one another?  What am I missing? 

GJ

[Arabas]

damn, somebody kill this Gremlin...
http://72.35.72.219/~library/16285/OBD%20codes.htm
read this GJ, maybe it helps.
possible causes

Pinched, shorted, and corroded wiring and pins
Crossed sensor wires
Exhaust leaks
Contaminated or damaged sensor

i don't know if these are irrelevant, but it seems that there are codes from the intake, to the turbo and then the exhaust...
either things are crashing for some reason, or because of the malfunction of one, the other(s) show malfuntction too.
i would start from the tuners advice, then i would replace the maf, the bypass valve and the O2 sensor.
if not under warranty, i believe these three would costa around $200-300 all.
this way you can eliminate (or not) the cause that these are bad stuff that causing the problems

[scanner]

Fix P0101, MAF signal dropping to zero during idle, note the OBD requires the turbo bypass valve to be closed for the test to run properly. 

P2261 indicates turbo bypass control valve is stuck closed.  You'll need a scantool that has output controls for the turbo bypass solenoid to diagnosis this. All GM dealers have one.  Or you can do the visual check I recommended before.

P2273 does not set on this car. This is a typo or a faulty scan tool, or maybe a badly modified ECM. MIL related DTCs are usually 5/50,000 emission warranty on all factory original equipment.  I do not recommend using the website provided by Arabas. It is not relevant.

[Gentleman Jack]

SORRY TYPO!

The last code is 2237, not (2273)  Typo!  My bad!

Scanner- how do you fix a MAF? Signal dropping to zero during idle?  The only times I have problems is after a WOT (or nearly WOT) not at idle?

P2261 - I checked vac lines and hoses, didn't find anything and have not had code come back.  Will re read your recs and try again.

P2237- any connection between the other two?

GJ