Solenoid valve replacement

robvin · **Posted:** Wed Dec 06, 2023 3:08 pm

Hey all,

Looking for solenoid 04606226AC in an attempt to fix my over boost problem.
Most suppliers are back ordered so I was hoping if anyone knows if other car makes/models have the same valve? maybe GM with their 2.8 or 3.0L CRD?

If not, and I have to wait if this valve to come back in stock, could I bypass the solenoid valve indefinitely?

Granted I don't know if this is causing the over boost but I was hoping to change it out at the same time as the MAP and CCV (on order)

WWDiesel · **Posted:** Wed Dec 06, 2023 10:22 pm

A bad vacuum solenoid won't cause overboost issues, only underboost ones. What DTC code are you getting?
But the modulator valve, PN 52109543AA, could cause overboost, but it would be very unusual, it too usually only causes underboost problems.

The most likely culprit is the MAP sensor or sticking turbo vanes. The vanes can be lubricated and exercised manually using some good penetrating oil.
Just be sure and disconnect the vacuum hose to the vane actuator when you manually stroke them.

Try changing the MAP sensor and see if it fixes your problem.
Use the GM MAP sensor GM 55206797, or New GM PN; 55568175. IDParts sales them and also available online from Amazon and several GM parts vendors.
:google:

the part number!
Much cheaper than the OEM sensor and it works perfect. :wink:

robvin · **Posted:** Fri Dec 08, 2023 5:39 pm

You are correct.
After making this post I did some research.

In any case I figured I'd replace it along with the MAP and intercooler pipes that are currently being shipped to me.
Ill be deleting the EGR and replacing pragmatic sensors all in one go.

taroo · **Joined:** Sun Apr 27, 2008 2:14 pm **Posts:** 292

robvin wrote:

You are correct.
After making this post I did some research.

In any case I figured I'd replace it along with the MAP and intercooler pipes that are currently being shipped to me.
Ill be deleting the EGR and replacing pragmatic sensors all in one go.

Oh my. The EGR and Flow Control Valve should have been removed a long time ago. Of course you need a block-off as well.

robvin · **Posted:** Wed Sep 18, 2024 1:52 am

Overboost is back!
P0234

Egr deleted
Yeti tune
New upper intercooler (charge) pipe
New map sensor
Turbo vanes a free

Code went an away for a good bit but now it’s back.

What should I check/replace next?

WWDiesel · **Posted:** Wed Sep 18, 2024 1:38 pm

robvin wrote:

Overboost is back!
P0234
Egr deleted
Yeti tune
New upper intercooler (charge) pipe
New map sensor
Turbo vanes a free
Code went an away for a good bit but now it’s back.
What should I check/replace next?

Is it putting the engine into a "Limp" mode?
What brand, part number MAP Sensor did you install?

In order to receive this DTC, the ECM is seeing a boost pressure higher than the limits set for it in the coding.
(The ECM controls Turbo Boost based on tables in the software and input/feedback from various sensors)

Quote:

P0234 -- Engine boost condition – limit exceeded

This means the MAP Sensor is reporting a boost pressure higher than the limits allowed to the ECM
Possible Causes:
-- Faulty MAP Sensor
-- Faulty Turbo Vane control Modulator Valve
-- Turbo Vanes sticking
-- Problem with tune

robvin · **Posted:** Wed Sep 18, 2024 5:41 pm

Thanks,

I got the map sensor from IDparts. It’s the proper Bosch unit

-Yes it goes into limp mode
-Yetis tune was working great without issues for a solid month. No smoke. Then till other issues came up (check my other threads) so I don’t think it’s his tune
-I’ll check the vanes again when I do the serp belt but when I checked two months ago everything seemed fine.
-is there a test a can do on the modulator to confirm if it’s faulty?

WWDiesel · **Posted:** Wed Sep 18, 2024 10:52 pm

robvin wrote:

Thanks,

I got the map sensor from IDparts. It’s the proper Bosch unit

-Yes it goes into limp mode
-Yetis tune was working great without issues for a solid month. No smoke. Then till other issues came up (check my other threads) so I don’t think it’s his tune
-I’ll check the vanes again when I do the serp belt but when I checked two months ago everything seemed fine.
-is there a test a can do on the modulator to confirm if it’s faulty?

Connecting a mechanical boost gauge may help tell you what the actual boost is.
Reading the peak boost pressure with a scanner and comparing it with actual boost on a mechanical gauge would tell you what the ECM is seeing from the MAP sensor.
You could have a bad MAP sensor, it does happen.
I would try another MAP sensor, you can use the GM MAP sensor as it is much less costly than the OEM unit.

BOSCH 0 281 002 845= GM PN: 55206797 New GM PN: 55568175 :google:

03black · **Posted:** Wed Sep 18, 2024 11:36 pm

You might need to take the turbo off and apart to check the vanes. I had to with mine and found that it was so sooted up that the vanes would stick. Its not hard to do, the exhaust section is held by 3 bolts and the turbo splits apart to reveal the vanes.

Job is a bit time consuming and as long if you dont remove the center cartridge you wont need to have the turbo rebalance.

Rabbit566 · **Joined:** Wed Mar 21, 2018 9:45 am **Posts:** 9

Any luck finding a fix for your p0234 code? I recently replaced my turbo and now I'm getting this code. Replaced turbo due to a no boost. Found out the supply hose to the intake was crack. Didn't check it well enough and replaced the turbo assuming it was locked up based on the very small amount of play it had when I cleaned it during rebuilding the top end after a water pump failure. It was running great before the new turbo and before the hose developed a crack.

EGR delete from Green Diesel
Green Diesel Tune
Vanes are free on the new turbo, tested with vacuum pump
I've replaced Turbocharger Vacuum Modulator
Have NOT replaced the MAP sensor or Vacuum control solenoid

I have not problem replacing these if need be. Hoping you may have found the fix.

Thanks!

WWDiesel · **Posted:** Sun Apr 12, 2026 9:07 pm

Some thoughts:
Has the EGR been removed or blocked off?
No tune can fix or prevent mechanical problems.
Replace the MAP, to be sure the ECM is getting the correct boost pressure signal.
Installing a mechanical boost pressure gauge can help greatly in diagnosing and pinpointing boost issues.
Compare your old turbo vane actuator linkage adjustment (position/length) to the new turbo and make sure your vanes are in correct adjustment.

You can bypass the vacuum solenoid for a test to rule it out.

Rabbit566 · **Joined:** Wed Mar 21, 2018 9:45 am **Posts:** 9

WWDiesel thanks for the response.

Has the EGR been removed or blocked off?
Yes completely removed

No tune can fix or prevent mechanical problems.
Tune and EGR were removed before I purchased it several years ago.

Replace the MAP, to be sure the ECM is getting the correct boost pressure signal.
Might do this but, I do get readings that move based on RPM off the MAP sensor but I have no clue if they are in range.

Installing a mechanical boost pressure gauge can help greatly in diagnosing and pinpointing boost issues.
Have mechanical boost gauge. it gets up to 30psi at times

Compare your old turbo vane actuator linkage adjustment (position/length) to the new turbo and make sure your vanes are in correct adjustment.
Great suggestion. Did not do this.

Thanks again.

WWDiesel · **Posted:** Mon Apr 13, 2026 12:36 pm

Quote:

Have mechanical boost gauge. it gets up to 30psi at times

That is TOO high, going above ~27psig can certainly cause overboost condition and put vehicle in limp mode.
Ask me how I know this! HA HA
The MAP sensor runs out of range around 27psig +

Some possibilities,
Bad MAP sensor?
Tune is pushing boost pressure to far during peak load events?
Turbo vanes actuator rod is misadjusted or vanes is sticking and not backing off quick enough.

Again, first thing I would do is change the MAP sensor. If it is giving a low (incorrect) boost signal to the ECM, the ECM will continue to try and push the boost when it sees a low pressure signal from the MAP.
Use the Bosch GM 55206797 New GM PN: 55568175 MAP sensor, it is much cheaper than the Mopar sensor. :google:

the part number, plenty of them available online.
Adjust the turbo vanes actuator rod to get a little less boost at full stroke? (Only AFTER ruling out MAP sensor)

Solenoid valve replacement

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