OBD2 Trouble Code P1000

OBD2 Trouble Code P1000

You don’t need to worry much about a P1000 code appearing on your OBD2 scanner. It’s an easy fix that you can resolve on your own.

What Does Code P1000 – OBD II Monitor Testing Not Completed Mean?

Code P1000 – Monitor Testing not Completed means the engine computer has not completed its emissions system testing. This code is a manufacturer-specific trouble code, and it may be something different for every manufacturer. Ford, Mazda, and Jaguar all use this trouble code with similar meanings.

Your vehicle performs self-diagnostics checks called readiness monitors. These are in place to test its emissions systems. The various readiness motors must be fully completed. If there was an issue at some point during this process, your OBD scanner will display the P1000 trouble code.

How Serious Is Code P1000?

P1000 is a simple diagnostics issue. You won’t need to delay the use of your vehicle because of this trouble code alone. If, however, it is displayed on your OBD2 scanner with another code, refer to that code’s safety instructions first.

Stop Driving If:

  • If code P1000 appears with another code
  • You notice a drop in your vehicle’s performance or fuel efficiency


  • Check engine light is on


Though the P1000 error code can have various causes, none of them are especially serious ones. Any of these issues may have stopped your vehicle from completing its readiness monitor testing:

  • New vehicle
  • Disconnected battery/powertrain control module
  • Error with OBD monitor
  • Recently clearing trouble codes

The following issue could indicate more serious problems.

  • Enabling conditions of readiness monitor(s) not met

If these conditions have not been met, then your vehicle will not perform all its readiness monitors. These problems, however, should show up on your scanner as other error codes alongside the P1000.


Thankfully, the P1000 error code is not very concerning. Generally, you only need to drive your vehicle for 80 to 100 miles, and the error code will go away on its own. It gives your vehicle ample time to complete its readiness monitors.

If you don’t drive your car often enough or want this issue dealt with sooner, you can perform a drive cycle. Below we’ll go through a few simple steps. Make sure to consult with your manufacturer or manual because some vehicles may have specific drive cycle instructions.

Clear the error codes, especially if other resolved error codes appeared alongside the P1000. Your fuel tank should be about 30 to 70 percent full.

  1. You will need to cold-start your vehicle. Let it sit for approximately 8 hours before starting it, which you can easily do overnight. The aim of this step is for the coolant temperature to lie below 122 F.
  2. Start the engine and let your vehicle sit idle for about two and a half minutes. Turn on the A/C and rear defroster during this time.

You’ll need ample driving space for the following steps, so we recommend driving on a highway if possible. Make sure to find a safe area to complete the remainder of your vehicle’s drive cycle.

  1. Turn off the rear defroster and A/C.
  2. Accelerate at a steady rate up to 55 mph. Keep driving at this speed for three minutes.
  3. Without breaking, slow down to 20 mph.
  4. Speed up to 55 mph at 3/4 throttle. Maintain this for five minutes.
  5. Again, without breaking, decelerate to a complete stop.

Completing a drive cycle shouldn’t cost you anything at all, except for a few bucks on gas. Other than the 8-hour cold start, it’ll take you less than 30 minutes to fully complete the drive cycle. Times may vary if your vehicle has additional steps.

If the fault code persists, you should consider if the scanner has any issues. See here for great replacement options.

P1000 is not a serious cause for concern on its own. You can safely continue driving, and the issue will likely resolve itself within a few days. A simple drive cycle can expedite the process but is not required.

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