Pre-code

Pre-code is a term describing boost cut by the ECU before logging a Volvo DTC - Diagnostic Trouble Code

“Pre-code” is a term I just invented to describe a situation where my Volvo has determined that something is irregular, but before it logs a diagnostic trouble code (DTC). Also, by definition, a pre-code is something that happens before a Check Engine light, since a DTC is a requirement of a Check Engine light.

I can tell when my 850 T5 is in a pre-code condition because it cuts my 850’s boost in half. I can easily feel this when accelerating, and can measure it because I installed a boost gauge in my Volvo 850.

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Author: Matt
Date: March 20, 2012

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8 thoughts on “Pre-code

  1. My s60 2001 all wheel drive is beeping when i start it up and the numbers 067 come up on my console….what does this mean?

  2. Currently it seems like WordPress is the preferred blogging platform out there right now.
    (from what I’ve read) Is that what you are using on your blog? Regards!

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