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Scan tool plug connector fault – I’ve worn out a few of these guys, they work hard and wear out.

Check the fuse box for 12 volt, cig lighter and OBD listing. It commonly blows because it shares a fuse with the vehicle’s 12 volt power point or the cigarette lighter. If the check engine light doesn’t light up on ignition the fuse is blown.

No power in the scan tool – The most common cause of no power in the tool is a blown OBD vehicle fuse.

Here’s a list of scan tool problems and what you can do to fix them: Scan tool faults aren’t that common, I’ve never broken a tool yet but I have worn out a few cable connectors. A few days of driving usually helps reset these components but issues can arise. Replacing or disconnecting a car battery for example will often require recalibration of steering angle sensors and throttle body position sensors etc. Similarly, replacing modules with used modules from other cars generally won’t work, control modules are coded to the original car’s chassis number. These may set fault codes that won’t clear until the system resets or is flash-coded.

Try this procedure when codes are stubborn and won’t clear after a repair.īear in mind some components require calibration or flash coding after replacement. It is not unusual for computer modules to experience a brain fart (logic lock) and just need time to get their crap together. However, some vehicles or modules may be a tad more sensitive to procedure. 2 Incorrect Code Clear ProcedureĬlearing codes can normally be achieved by simply hitting clear codes on the scanner and job done. These types of codes need to be repaired before they can be cleared from the computer module.Īfter diagnosing and repairing the fault codes successfully, clearing the codes may require following a set procedure, see “Incorrect code clearing procedure” below. Hard codes on the other hand are current static faults that are affecting vehicle system performance.

Technicians describe Hard codes as live current faults, that’s a fault that comes back just as soon as you clear it.Ī technician may describe soft codes as historic anomalies or intermittent codes that don’t affect vehicle function. I’ll also assume your tool communicates with the vehicle modules and doesn’t respond with “No Communication” if it does see “Scan tool faults below”.Ĭode readers are also known as scanners read hard and soft codes. Most scan tools automatically communicate with the vehicle modules over the communication network. I’m assuming all is good with your scan tool, it powers up when you connect to the OBD port (if it doesn’t see “Scan tool faults below”).

Your fault codes are live, this is the most common reason why your vehicle’s fault codes won’t clear.