PLEASE HELP! P0237 & P2463 Error Codes
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Joined: Jul 2025
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From: Ireland
2013 C220 W204 OM651 2.1L CDI AMG
PLEASE HELP! P0237 & P2463 Error Codes
Hello, I have had my OM651 2.1L W204 parked up for the last 2 months, trying to figure out what's causing my car to go into limp mode constantly. After driving it one day and experiencing a complete loss of power, I received an Air Intake Leak error and Turbocharger error, which persists as the P0237 error.
Initially, it only said air intake leak and turbocharger underboost. Here's everything I've done to try fix it:
7. Attempted a 4-hour motorway passive regen.
8. Used a DPF spray-in cleaner.
9. Removed & fully cleaned the DPF in a Wynns DPF Cleaner soak.
The car previously would creep its revs up to 2K. Since fixing the air intake leak, the car has become responsive again; however, the car still won't rev above 2.5K when in drive, but will happily rev to over 3K when in park.
DPF was definitely cleared as it looks as good as new and air & water were passing through it with 0 issue after it's soak.
I just cant understand whats going on and I have absolutely no idea what's throwing my turbocharger code!
Please give some advice on where to go or what sensors to try to check next, because I'm at a loss.
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Initially, it only said air intake leak and turbocharger underboost. Here's everything I've done to try fix it:
- Replace fuel filter (this was before diagnostics).
- Checked the 3 air sensor voltages leading to/from MAF.
- Checked the turbo & turbo actuator.
- Checked intercooler pipes.
- Replaced MAF.
- Replaced Air Intake Manifold & De-Carboned the EGR intake (This thankfully got rid of the air intake leak code, but then threw the P2463 code). *I had to drive the car whilst in limp as there's no other transport locally. So I figured I clogged the DPF.
7. Attempted a 4-hour motorway passive regen.
8. Used a DPF spray-in cleaner.
9. Removed & fully cleaned the DPF in a Wynns DPF Cleaner soak.
The car previously would creep its revs up to 2K. Since fixing the air intake leak, the car has become responsive again; however, the car still won't rev above 2.5K when in drive, but will happily rev to over 3K when in park.
DPF was definitely cleared as it looks as good as new and air & water were passing through it with 0 issue after it's soak.
I just cant understand whats going on and I have absolutely no idea what's throwing my turbocharger code!
Please give some advice on where to go or what sensors to try to check next, because I'm at a loss.
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Last edited by Holyguaka; Jul 2, 2025 at 08:34 AM.
Thread Starter
Newbie
Joined: Jul 2025
Posts: 3
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From: Ireland
2013 C220 W204 OM651 2.1L CDI AMG
Update 1:
I think I got it figured out this morning.
A family friend managed to get a more advanced diagnostic tool with live data. One of the sensors grouped in the error P0237 was showing 0 data. I switched the sensor from the turbo boost pressure (not the sensor going into the MAF for anyone else having similar issues, it's the one beside and lower than the MAF sensor) to the sensor at the intake manifold, I believe this is the MAP sensor.
This changed my error code from Turboboost Circuit A to Turboboost Circuit B (P0241), and both sensors have the same ID codes (A0071530028 - 0261230196), so I know one of the sensors (I believe the original MAP sensor) is dead.
I presume that when the intake manifold got its hairline crack, the sensor packed in, which would keep in line with my luck with cars.
The car is still showing a solid yellow engine light, but full power has returned, and she's feeling more responsive than before the fixes. I presume it's thanks to a fully cleared DPF and a new intake manifold without a heat crack forming.
Thankfully, I can get a second-hand sensor with identical coding to the MAP and Boost Pressure sensors, with a month's warranty for around €55, and I'm not gambling which sensor to buy, as they're identical.
I'll be posting a final update with a more precise wording on every issue I faced and how I'd figure out resolving it, as I've nearly had the whole engine bay dismantled over the last couple of months of diagnostics.
I think I got it figured out this morning.
A family friend managed to get a more advanced diagnostic tool with live data. One of the sensors grouped in the error P0237 was showing 0 data. I switched the sensor from the turbo boost pressure (not the sensor going into the MAF for anyone else having similar issues, it's the one beside and lower than the MAF sensor) to the sensor at the intake manifold, I believe this is the MAP sensor.
This changed my error code from Turboboost Circuit A to Turboboost Circuit B (P0241), and both sensors have the same ID codes (A0071530028 - 0261230196), so I know one of the sensors (I believe the original MAP sensor) is dead.
I presume that when the intake manifold got its hairline crack, the sensor packed in, which would keep in line with my luck with cars.
The car is still showing a solid yellow engine light, but full power has returned, and she's feeling more responsive than before the fixes. I presume it's thanks to a fully cleared DPF and a new intake manifold without a heat crack forming.
Thankfully, I can get a second-hand sensor with identical coding to the MAP and Boost Pressure sensors, with a month's warranty for around €55, and I'm not gambling which sensor to buy, as they're identical.
I'll be posting a final update with a more precise wording on every issue I faced and how I'd figure out resolving it, as I've nearly had the whole engine bay dismantled over the last couple of months of diagnostics.
