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CEL but no usable code

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Old Apr 12, 2026 | 01:28 PM
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CEL but no usable code
Hello all the DIYers out there. My 2018 E63S sedan is idling high and is throwing a CEL but the only related OBD2 code is for high idle. I am thinking vacuum leak, but wonder if any one else has had a high idle issue and what codes it threw? Car has a RennTech tune but was there for 18 months without codes.

thanks for any help!


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Old Apr 12, 2026 | 02:23 PM
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Update- the car only idles fast when it is in D or R, idles at 750rpm when in P or N.
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Old Apr 12, 2026 | 03:13 PM
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What OBD scanner are you using?
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Old Apr 12, 2026 | 04:31 PM
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Hello- I use a Autel maxiPRO MP900E.

now I’m thinking it is not a vacuum leak because it is fine if the transmission isn’t in gear. Wondering if a partially clogged transmission filter or passage in the valve body would cause the idle to increase to achieve proper transmission pressure.
Last edited by RaleighE63S; Apr 12, 2026 at 04:36 PM.
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Old Apr 13, 2026 | 12:08 PM
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Is this RPM issue present in stock and tuned modes?
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Old Apr 13, 2026 | 04:15 PM
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Old Apr 13, 2026 | 06:21 PM
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Yes, I’ve put it back to stock and it does the same thing.
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Old Apr 13, 2026 | 06:33 PM
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quick video. Cold start, revs to do self check, settles down. RPMs jump up when I engage D or R.

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Old Apr 14, 2026 | 02:22 AM
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One further thought -- have you done a transmission calibration reset?
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Old Apr 14, 2026 | 05:53 PM
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Old May 16, 2026 | 10:40 PM
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Still no code but I did a transmission service and in 25 miles the light is off and car idles perfectly.

hypothesis is that one of the transmission filters was restricted cause the engine to increase rpms at idle to get enough oil through the filter. No evidence but the light is off.
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