P1000

PowertrainObd Systemlow severityManufacturer-specific

OBD-II Monitor Testing Not Complete

What P1000 Means

The PCM has not completed its full OBD-II self-diagnostic cycle. All readiness monitors have not yet run to completion. This code commonly appears after the battery has been disconnected, codes have been cleared, or the PCM has been replaced. It is not a malfunction code but indicates the system has not yet validated emissions monitors.

Symptoms

Check Engine Light on briefly
No drivability symptoms
Failed emissions inspection due to incomplete monitors

Common Causes

Battery recently disconnected
DTC codes recently cleared
PCM recently reprogrammed or replaced
Insufficient drive cycles completed
Other DTCs preventing monitor completion

Diagnostic Steps

Check for other stored DTCs that may be preventing monitors from running
Perform a Ford OBD-II drive cycle to complete all monitors
Drive cycle requires a mix of city and highway driving under specific conditions
Recheck readiness monitors with scan tool after drive cycle

Where to start: Complete the Ford-specific OBD-II drive cycle. No repair needed unless other codes are present.

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