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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Tue, Jul-16-2013, 02:52:48 PM   #11
Roux28
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Default Re: Engine coolant temp, plausibility

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Originally Posted by kuksul08 View Post
I had that code, fixed the thermostat, still got the code. Oh well, not really that big of an issue.
In my case, the temp of the motor was running below what it should have been, and causing the DME to read that the engine was always cold, thus adding more fuel, in which was causing some other issues. The thermostat being replaced now has helped a bit, but im still going to replace it anyway i guess


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Originally Posted by waldron80 View Post
It is #18. It is under the air box and a pain to get to. Some people managed to change it out by not taking it all apart but I took the box out and cleaned my idle control valve as well. #4 does not communicate to the OBC. It is a thermal switch that runs the aux fan. I changed #18 and my code went away.
Thanks, and that's what I've heard. Good to know that. Did you just remove the airbox? Or did you have to remove the intake manifold?
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Old Tue, Jul-16-2013, 03:55:54 PM   #12
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Default Re: Engine coolant temp, plausibility

My bad, Yes, when I was talking about the air box I was speaking of the intake manifold. I removed the whole manifold. The starter DIY HERE shows you how to remove it. Good luck.
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Old Tue, Jul-16-2013, 04:21:43 PM   #13
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Default Re: Engine coolant temp, plausibility

had the same code before, replaced #18 and yes you have to remove the air box, but few months later when i read codes (no engine light) that code still comes up.
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Old Tue, Jul-16-2013, 04:41:15 PM   #14
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Default Re: Engine coolant temp, plausibility

I've had this code for a little while (and only this code). I noticed it takes a little longer to warm up, meanwhile I experienced no overheating even on track at 80-90 degF ambient. I got it checked out by my mechanic (pretty well-known M car specialist), and he even said that I may be one of the lucky ones who has a slightly defective thermostat that ends up keeping the engine cooler. Anyways, no problems for me at all so far.
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Old Tue, Jul-16-2013, 08:41:36 PM   #15
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Default Re: Engine coolant temp, plausibility

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Originally Posted by waldron80 View Post
My bad, Yes, when I was talking about the air box I was speaking of the intake manifold. I removed the whole manifold. The starter DIY HERE shows you how to remove it. Good luck.
Thanks, that helps a lot. Too bad I cannot just reach it. Frustrating when you can see it right there.

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Originally Posted by kokgo20 View Post
had the same code before, replaced #18 and yes you have to remove the air box, but few months later when i read codes (no engine light) that code still comes up.
Did you replace the thermostat as well? I'm getting the code, but no SES light as well.

Quote:
Originally Posted by will.c View Post
I've had this code for a little while (and only this code). I noticed it takes a little longer to warm up, meanwhile I experienced no overheating even on track at 80-90 degF ambient. I got it checked out by my mechanic (pretty well-known M car specialist), and he even said that I may be one of the lucky ones who has a slightly defective thermostat that ends up keeping the engine cooler. Anyways, no problems for me at all so far.
Yeah I'm having bad cold starts and was running a little rich until I replaced the thermostat. The car runs a little better now, I'm just one of those who like everything to be right. Even though no SES, the code showing up bothers me. OCD I guess.
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Old Tue, Jul-16-2013, 10:37:39 PM   #16
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Default Re: Engine coolant temp, plausibility

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Originally Posted by Roux28 View Post
Did you replace the thermostat as well? I'm getting the code, but no SES light as well.
yes, the code comes up but no SES light.
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Old Tue, Oct-31-2017, 09:58:22 PM   #17
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Default Re: Engine coolant temp, plausibility

I know this is an old thread, but figured I'd log the solution that fixed my problem for what seems for good now. It's an alternate solution not mentioned in this thread or other threads I have read.

It had been quite some time I had been getting Code 69 for Engine Temperature Plausibility. The code would go away after driving for a few days, but would pop up again after a week or so. It didn't bother me too much so I didn't do anything about it. It had been getting progressively more frequent as time went on. Initially it would pop up about once a month and then go away. It did start popping up weekly before I finally got it fixed.

I was on the track and car got really sluggish under hard acceleration. Figured it was time to clean my Vanos Solenoid. I decided to go ahead and get a refurbed Solenoid Pack from Beisan while at it though I think my old one was fine. After doing this quick and easy 30 minute job, the code has not come back at all (2 months so far). Also, I noticed my car had always been more sluggish than before I cleaned the Solenoid. So my thought is that perhaps it was being caused by my 'dirty' solenoid all along. As it got dirtier over time the code was popping up more frequently.

So maybe try the above before you start changing thermostats and temperature sensors. It's a real easy DIY.
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Old Wed, Nov-01-2017, 03:15:15 AM   #18
Dirty Elf
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Default Re: Engine coolant temp, plausibility

Quote:
Originally Posted by rickyboycz View Post
I know this is an old thread, but figured I'd log the solution that fixed my problem for what seems for good now. It's an alternate solution not mentioned in this thread or other threads I have read.

It had been quite some time I had been getting Code 69 for Engine Temperature Plausibility. The code would go away after driving for a few days, but would pop up again after a week or so. It didn't bother me too much so I didn't do anything about it. It had been getting progressively more frequent as time went on. Initially it would pop up about once a month and then go away. It did start popping up weekly before I finally got it fixed.

I was on the track and car got really sluggish under hard acceleration. Figured it was time to clean my Vanos Solenoid. I decided to go ahead and get a refurbed Solenoid Pack from Beisan while at it though I think my old one was fine. After doing this quick and easy 30 minute job, the code has not come back at all (2 months so far). Also, I noticed my car had always been more sluggish than before I cleaned the Solenoid. So my thought is that perhaps it was being caused by my 'dirty' solenoid all along. As it got dirtier over time the code was popping up more frequently.

So maybe try the above before you start changing thermostats and temperature sensors. It's a real easy DIY.
interesting. i've had this code on and off for a few years after changing the thermostat and sensor. perhaps i'll try the solenoid. thank you!
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Old Thu, Dec-07-2017, 06:55:04 AM   #19
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Default Re: Engine coolant temp, plausibility

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Originally Posted by Dirty Elf View Post
interesting. i've had this code on and off for a few years after changing the thermostat and sensor. perhaps i'll try the solenoid. thank you!
Did you end up trying this out? I have the same issue and would like to see if this is the right remedy.
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Old Thu, Dec-07-2017, 03:46:31 PM   #20
Dirty Elf
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Default Re: Engine coolant temp, plausibility

haven't yet... did the rod bearings and oil pan gasket instead

i also replaced my o2s and egt which were constantly throwing codes so i will need to put some miles on it and see what codes come back
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Discussing Engine coolant temp, plausibility in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)