No check engine light when SC turns off?
Thread Starter
Senior Member
Joined: Jul 2006
Posts: 325
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From: Brooklyn, NY
2006 Granite Grey CLS55
No check engine light when SC turns off?
Is it normal that the car doesn't throw a check engine light when the SC turns off? Say you have a faulty IC pump, and those times that the SC turns off after flooring the car for a period of time, shouldn't it throw at least some type of code?
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Joined: Jun 2009
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From: San Ramon, CA
A Prius because I'm green
When mine went out no CEL or warning came on. I was told there is a code but you have to dig for it and it doesn't refer to the pump exactly. I even remember others saying something similar when I researched it on here. The issue would be the dealer not being able to duplicate the SC shutting off just with regular driving and would return the car unfixed, so as I learned from research to pressing the dealer into fixing it and they did. I'd imagine no CEL would come on since the engine is still running fine.
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Joined: Oct 2009
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2005 E55
Yeah I tried to push him to change to the new IC pump. He did know about problems with the oem pump and mentioned that the new replacement is near bullet proof. In the end he said he cant change it without it being broken and if it was it would throw a code.
When mine went out no CEL or warning came on. I was told there is a code but you have to dig for it and it doesn't refer to the pump exactly. I even remember others saying something similar when I researched it on here. The issue would be the dealer not being able to duplicate the SC shutting off just with regular driving and would return the car unfixed, so as I learned from research to pressing the dealer into fixing it and they did. I'd imagine no CEL would come on since the engine is still running fine.
Last edited by Mamba003; Nov 26, 2009 at 08:36 AM.
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From: Central WI (BFE)
SL55, ML500 & Acura TL
No codes when the SC shuts down because of heat, at least nothing obvious like a CEL. My IC pump was nearly dead as far as flow rates and I never got a code. the Merc dealer checked the IC pump flow rates after I complained about extreme loss of power. They confirmed a nearly dead IC pump, but never said a thing about a code having been thrown.
Thread Starter
Senior Member
Joined: Jul 2006
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From: Brooklyn, NY
2006 Granite Grey CLS55
Well, I had my pump replaced with the MC30, and even got an aftermarket HE (LET). The problem still occurs, it turns off, but then goes back on a minute later. Do you guys think a full coolant flush would solve the issue?
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From: Toronto
V12TT
Good Luck
