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This is one of the most frequent OBD2 trouble codes. Read the full article below to know what it means, how to fix it, and what other codes may show related to it.


The diagnostic trouble code P1000 is a manufacturer-specific code that specifies that the OBDII monitor test couldn't be performed in the case of carmaker Ford and Jaguar. For Mazda vehicles, it implies that the driving cycle has not been finished. 


While it is normal for most error messages to have multiple meanings and causes, this particular DTC code only refers to incomplete OBD-II monitor testing or an OBD-II drive cycle malfunction, depending on the manufacturer of your vehicle. This code is manufacturer-specific and occurs commonly in Ford and Jaguar vehicles. 

This code is triggered in Fords and Jaguars when the powertrain control module (PCM) fails to complete a full diagnosis cycle. The on-board diagnostic (OBD) monitors scan your vehicle during the drive cycle to check for trouble codes. When one of the monitors fails to complete a diagnostic check the P1000 code is stored.

Please take note that this code cannot be deleted until other different codes are resolved or the conditions that triggered it are resolved.

For Ford: P1000 implies OBD II Monitor Testing Not Complete 

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

For Kia: P1000 implies System Diagnosis Incomplete 

For Mazda: P1000 implies OBD II Drive Cycle Malfunction 

For Land Rover: P1000 implies ECM memory eradicated – No Codes Stored


  • The vehicle is new from the factory
  • Disconnected battery 
  • Power train control module DTCs have recently been cleared with a scan tool
  • Power take-off (PTO) circuit is shorted to B+ or VPWR
  • Power take-off (PTO) is on during testing
  • The time needed for the OBDII system to fully restart may not have elapsed, once a code has been deleted without being resolved.
  • The operating cycles required to remove code P1000 were not finished.
  • The presence of any issue code that forestalls all the empowering states of a specific monitor to be met.
  • The shortfall of any empowering condition, for example, the gas tank isn't somewhere in the range of 25% and 75% full, which will forestall the EVAP screen from running or finishing effectively.


The P1000 code indicates a diagnosis problem rather than any issue in the vehicle, so there are no associated drivability issues. The only symptom you’ll see is the activation of the check engine light (CEL) or Malfunction Indicator Lamp (MIL) on your dashboard.


For the diagnosis of P1000 code, you’ll need an OBD2 Scan tool and Screwdrivers (For battery hook-ups)


  1. If it’s a brand-new car, drive it for some time before taking any other steps. The code will probably clear on its own in a day or two (Advisable to drive around 100 miles).
  2. Scan your vehicle with an OBD2 scan tool and if any other trouble codes come up, fix those first.
  3. Check that the cables are firmly connected to your battery terminals.
  4. Find your powertrain control module (PCM) using your vehicle’s manual. Examine all the connections around it and make sure nothing is disconnected. If you see any frayed or broken wires immediately replace them.
  5. Run a diagnostic test using an OBD2 scan tool. Examine and record the freeze frame and live data to make sure all your OBD2 monitors are reporting.

Common mistakes

Don’t forget that this is a manufacturer explicit OBDII code. Ensure you’re reading the correct definition for your vehicle manufacturer. While numerous definitions of the P1000 code are similar, they can be identified with different systems for specific manufacturers.

How serious is this?

The P1000 code is of low seriousness. You can safely drive your vehicle even when the check engine light is illuminated, without taking a chance with the safety of either the driver or the car.

What repairs can fix the code?

There is no specific or general diagnostic or repair/fix procedure for this code. But in most cases, this code is resolved by finishing a drive cycle as defined by the manufacturer. This error message is common, especially in Ford vehicles. 

This particular error code disappears on its own as part of normal driving. Therefore, there is no compelling reason to clear the code. Indeed, clearing the code physically may actually cause a further issue by killing the MIL indicator. The only reason to be concerned with this code is if it is accompanied by other code because that could indicate other problems.

Related codes

P1299 - Cylinder Head Over Temperature Protection Active

P1101 - Mass Air Flow (MAF) Sensor Out of Self-Test Range

P1405 - Differential Pressure Feedback Sensor Upstream Hose Off or Plugged

P1336 - Crankshaft/Camshaft Sensor Range/Performance

P1001 - Key on Engine Running (KOER) Not Able to Complete, KOER Aborted

P0171 - System Too Lean (Bank 1)

P0174 - System Too Lean (Bank 2)

P1639 - Vehicle ID Block Corrupted or Not Programmed


The OBD-II scanner error code P1000 not really a problem. Though it does indicate that some diagnostic testing was not completed, but it does not block your ability to drive your vehicle. In fact, this error code should resolve itself with normal driving.