Error Code P1000 is a manufacturer-specific code. Different manufacturers use the code for their own purposes, which ultimately requires different diagnosis, and troubleshooting and repair.


Error Code P1000 is quite a misleading term because it’s not actually a fault code. As a matter of fact, if it shows in the dash panel, it simply means the reset cycle of your engine computer has not been completed yet. Usually, to reset the code, the battery’s (-) terminal should be disconnected for a minute before reconnecting. On some vehicles such as Ford however, the previous cord is not totally erased, which means the code will still show up.

For Ford: P1000 means OBD II Monitor Testing Not Complete

For Kia: P1000 means System Diagnosis Incomplete

For Jaguar: P1000 means Engine Control Module (ECM) – Internal Error

For Land Rover:  P1000 means ECM memory erased – No Codes Stored

For Mazda: P1000 means OBD II Drive Cycle Malfunction

Common Symptoms

Aside from Check Engine light being activated, there are no other symptoms for this error code that can cause issues with driving or compromise the engine’s performance.

Possible Causes

Different makes have different causes for this error code:

  • For Ford and Mazda, disconnecting the battery or the PCM or not clearing diagnostic code will result in this error code. Also for Ford, an OBD monitor concern may have occurred before the drive cycle has been completed.
  • The PCM DTS have just been recently cleared with M-MDS.
  • The PCM flashed and OBD drive mode has not yet completed.

How to Check                                         

The easiest way to erase this code is to run the car for about a week. This should be enough to get rid of all the codes from the memory. With some vehicles, such as Mazda, you may need to use a resistor to bypass the coolant sensor and air temperature sensor, and fool the computer of the engine to think the engine has already reached its “warmed up” temperature. Having this set and setting the vehicle for a few minutes in drive mode (raise the drive wheels) and cycling the ignition key in on and off position, could imitate the completed cycle.

How to Fix

Though this error code is one of the most most common error codes there is, it’s a very minor issue. As a matter of fact, vehicle owners can often simply ignore this problem, as it can go away as part of normal driving. There’s really no need to clear this code, as it may not turn off the Check Engine light. If the error code stays on, then there may be other issues.

There are various ways to diagnose and repair the error:

The first step is to verify and record the freeze frame data on the repair order.

Then, verify the availability of the repair information. Verify the related service repair and then conduct the diagnosis or repair according to the availability of repair information.

Check your vehicle for other error codes. If you get another different DTS code, then head straight to the required inspection. If there’s no other error code, then you can proceed to clear DTC P1000. After completing an OBD drive mode before further inspection or maintenance test.

After completing a drive mode, verify the trouble code. Make sure you connect all the disconnected connectors. You may need to replace the PCM if deemed defective.

Then, use the M-MDS to clear the error code from the memory’s PCM.

Start up the engine and warm it up until it reaches its normal operating temperature.

Then, run your vehicle under the stored condition of your Freeze Frame Data. You can now retrieve the DTS using the M-MDS. If the pending code is still the same (P1000), then verify the repair procedure and head to the applicable inspection for the particular error code.

Then, conduct an “after repair procedure”. If there’s no DTC present, then your troubleshooting has been completed.

Feel free to  Contact Us  for professional help with this error code.