# Check Engine Light : DTC 55

**URL:** <https://forums.speedlife.net/t/check-engine-light-dtc-55/108943>\
**Category:** SON240sx Automotive\
**Created:** [August 27, 2007, 10:22am UTC](https://forums.speedlife.net/t/check-engine-light-dtc-55/108943 "2007-08-27T10:22:07Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![rsam240sx](https://avatars.discourse-cdn.com/v4/letter/r/4bbf92/32.png) [@rsam240sx](https://forums.speedlife.net/u/rsam240sx)\
**Post date:** [August 27, 2007, 10:22am UTC](https://forums.speedlife.net/t/check-engine-light-dtc-55/108943/1 "2007-08-27T10:22:07Z")

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The check engine light came on a while back. I finally got around to reading the ECU trouble codes. The diagnostic trouble code is 55 - no failure (No self Diagnostic Failure indicated) – this means all is OK.  
I then cleared the stored codes on the ECU but the light came back on and again got DTC 55.  
Anyone experience this before or know what’s wrong? Do I have to take it in and get Nissan to read/scan it??

Oh yeah my car is a 1995…

Any help would be greatly appreciated, I hate seeing that light on…

thanks  
Rick

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**Author:** ![rsam240sx](https://avatars.discourse-cdn.com/v4/letter/r/4bbf92/32.png) [@rsam240sx](https://forums.speedlife.net/u/rsam240sx)\
**Post date:** [August 27, 2007, 1:41pm UTC](https://forums.speedlife.net/t/check-engine-light-dtc-55/108943/2 "2007-08-27T13:41:18Z")

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If everything is fine then why is the check engine light still staying on??

Any ideas?

Thanks  
Rick