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Limp home mode, code P1189-8 M55

Tiny
JAY HUGHES
  • MEMBER
  • 2004 MERCEDES BENZ 270ML
  • 2.7L
  • 5 CYL
  • TURBO
  • 4WD
  • AUTOMATIC
  • 127,000 MILES
Hi, I have the car listed above ml270cdi. Which is currently in limp home mode. I have hooked it up to a diagnostic machine which has brought up a few codes, one which is code P1189-8 M55 inlet port shut off motor. Checked signal line of component M55 for discontinuity. I don’t know what this means? Does it mean the swirl flap motor is faulty or is it something else? I have replaced MAF sensor and cleaned EGR and manifold, EGR seems to work fine. Swirl flaps are not actuating so something is not working but unsure whether it’s the motor or an electrical fault. All in is greatly appreciated, thanks in advance.

Jay
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Thursday, January 31st, 2019 AT 11:59 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,959 POSTS
This happens when the throttle actuator gets dirty. here is a guide that will help walk you through the process:

https://www.2carpros.com/articles/reduced-power-limp-mode

Please run down this guide and report back.
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Saturday, February 2nd, 2019 AT 2:19 PM

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