Publisher · getcodemap.com

About Code Map

Code Map turns pasted diagnostic trouble codes into a bay strategy: system topology, ordered tests, and a tools checklist. It is built for people who already know how to wrench — indie shop techs, mobile diagnostics, and serious DIYers who want a clear plan before they open a parts cannon.

Who it is for

Independent repair shops often juggle scan data, service information subscriptions, and the clock. Code Map is a fast second screen: paste P0300, P0171 (or any P/B/C/U codes you have), add year/make/model context, and get a structured path — what system you are in, what to check first, which tools belong on which step, and when to stop and verify. DIY owners who own a decent scanner get the same workflow without wading through forum threads that skip the fundamentals.

It is not aimed at replacing a master tech’s judgment, a dealer’s OEM portal, or formal training. If you are learning basics, treat the packs as study aids alongside a service manual — never as a substitute for safety procedures around fuel, high voltage, airbags, or running engines.

What Code Map is (and is not)

It is an educational strategy layer on top of a large OBD-II catalog (thousands of generic codes plus a manufacturer-specific index) and a growing set of original “strategy packs” written for common, high-mileage complaints. Packs emphasize topology and sequence: for example, lean (P0171) before chasing every misfire (P0300) when both are present, or treating P0700 as a messenger to dig into TCM codes rather than guessing a transmission rebuild.

It is not OEM service information, a TSB database, a wiring diagram set, or a parts locator tied to your VIN. Always verify torque specs, connector views, and campaign bulletins against the manufacturer’s procedures for that vehicle. Wrong-year assumptions and wrong-engine assumptions still break cars — Code Map will not stop you from that; your habits will.

How strategy packs work

When you submit codes, the tool looks up definitions from the generic catalog and, when you pick a make, manufacturer-specific hits where available. If one or more codes match a live strategy pack (for example P0171 lean, P0300 random misfire, P0420 catalyst efficiency, P0455 EVAP large leak, P0128 thermostat, P0101 MAF, U0100 lost communication with ECM, or P0700 TCM messenger), you get the full pack: lead narrative, topology map, ordered diagnostic steps, tools-by-step checklist, and stop/go verify notes. Codes outside the pack list still receive definitions plus a generic diagnostic workflow so you are never left with a blank screen.

Packs are original Code Map content. Catalog definitions draw from open data sources (OBDex generic under CC0; manufacturer index under MIT) credited on the site. We expand packs based on what bay techs actually ask for — multi-code interactions, network codes, and “messenger” codes that waste hours when read literally.

Publisher identity

Code Map is published by Lonnie Draper, operating Code Map / Sinister Speed Shop LLC (Arizona). The apparel and wrap side of Sinister Speed Shop is a separate product line; getcodemap.com is the DTC education and tools property. Advertising on the site (Google AdSense) helps keep the free tool available. Contact: lonnie6065@gmail.com.

Feedback from the bay

If a pack skips a test you always run, names a tool wrong for your market, or needs a make-specific fork, email us. Real shop feedback shapes the next pack more than any analytics dashboard. See Contact for what to include so we can reproduce the scenario.