OBD-II trouble code
P1000: Ford P1000 — OBD II Monitor Testing Not Complete
Application matters: This page covers Ford’s P1000 readiness message using its 1999 PCED documentation. Incomplete self-tests are different from a component diagnosis: they neither establish a failed part nor certify a fault-free vehicle. Use the current procedure for the actual model and check other codes, readiness status and symptoms.
Ford reports that OBD II monitor testing has not completed. Review readiness and other faults; a reset can explain incomplete tests without proving the vehicle is fault-free.
Quick facts
- System
- Powertrain
- Category
- OBD Readiness
- Severity
- Low severity
- Driving guidance
- Depends on symptoms and vehicle guidance
- Repair cost range
- Get a vehicle-specific estimate after diagnosis.
- DIY difficulty
- Beginner DIY
A code alone cannot establish whether driving is safe. Stop safely for a red brake or oil-pressure warning, overheating, severe misfire, stalling, or impaired braking or steering, and follow the owner's manual. Restraints faults can reduce crash protection even when the vehicle runs normally.
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What does P1000 mean?
P1000 is Ford’s message that its OBD II self-tests have not all completed. It describes readiness rather than identifying a failed component. A vehicle can have incomplete monitors after service, but it can also have a fault while testing remains incomplete. Read the readiness results and the rest of the scan report together.
Ford’s 1999 PCED lists several situations: a new vehicle that has not completed its drive cycle, battery or PCM disconnection, scan-tool clearing during repair, and a monitor failure before cycle completion. A known battery reset can explain the testing status; it does not rule out an unrelated or unresolved problem. Reported symptoms still need assessment even when P1000 is the only code shown.
In that Ford procedure, P1000 leaves memory when the required monitors successfully complete. Repeatedly erasing fault memory can reset readiness again. Checking which tests remain incomplete is more useful than repeatedly trying to erase this message.
Each vehicle has requirements for running and evaluating its monitors. Ordinary driving may meet them, but a particular trip or elapsed time does not guarantee completion. If a test stays incomplete, a technician can check the applicable prerequisites, other faults and the vehicle’s service procedure. The 1999 document also identifies a power-take-off condition on vehicles so equipped; that is a specific diagnostic context, not an instruction to alter a circuit.
If an inspection is approaching, obtain its actual readiness requirements and have the vehicle checked against them. P1000 alone does not determine the inspection result or prove that a repair is complete. Any required verification must be performed safely; do not watch a scan tool or try to reproduce a drive cycle while driving.
Possible causes
- Readiness reset after battery or PCM disconnection, as listed in the 1999 Ford procedure
- Fault memory cleared with a scan tool during repair
- A new vehicle that has not yet completed the required monitor testing
- A monitor failure before completion of the drive cycle
- Vehicle-specific monitor prerequisites or other faults that need assessment when testing stays incomplete
- A power-take-off operating or circuit condition on an equipped vehicle covered by the dated Ford procedure
Symptoms
- One or more monitors shown as incomplete or not ready on a scan tool
- P1000 appearing after a battery disconnection or code clearing
- Incomplete readiness discovered before an inspection
- No noticeable running symptom, or separate symptoms that still require diagnosis
Diagnostic steps
Save the full scan report, code status, and available freeze-frame data before clearing anything. Confirm the reporting module, any failure-type suffix, and the procedure for the exact vehicle. The steps below are an overview; use manufacturer specifications and safety procedures for testing.
- 1.Save the complete scan report, including readiness results and stored or pending codes, before clearing anything. Record warning lamps and any running symptoms.
- 2.Check whether the battery or PCM was disconnected or fault memory was recently cleared. Treat that as a possible explanation for incomplete testing, not proof that no fault remains.
- 3.Review the individual monitor results and the current manufacturer procedure for the actual vehicle. Address other codes and symptoms rather than assuming readiness is the only concern.
- 4.Avoid repeated code clearing to remove P1000. Ford’s cited procedure requires successful monitor completion; erasing memory can reset the testing progress.
- 5.If readiness remains incomplete, ask a technician to check the applicable prerequisites and faults that could prevent completion. On an equipped work vehicle, disclose any power-take-off use so the relevant procedure can be selected.
- 6.For an upcoming inspection, confirm the local requirements and arrange any needed vehicle-specific verification. Do not improvise a driving cycle, handle a scan tool while driving or assume a fixed journey guarantees readiness.
Repair cost
Get a vehicle-specific estimate after diagnosis.
A trouble code alone does not price the repair. Ask the shop to identify the confirmed fault and itemize diagnosis, parts, labor, programming or calibration, and taxes.
Estimate your repair
Run the numbers for your vehicle
Open the Repair Cost Estimator with check engine light diagnosis preselected. Adjust labor rate and vehicle category to fit your situation.
Related repairs
These links are planning examples; the code does not confirm that any listed part has failed.
DIY vs shop
Some initial checks may suit a beginner. Confirm the diagnosis and read the procedure for your exact vehicle before buying parts. Access, required tools, and the confirmed fault determine the difficulty and time involved.