P1587
Throttle Control Unit Modulated Command Malfunction
Findings, check these first
- TCU command driver fault
- Wiring fault in the command circuit
- Failing throttle motor
- Corroded connector
- PCM command fault
Standard procedure
- Test TCU command output
- Check the command circuit
- Verify throttle motor response
- Inspect connectors
- Replace the TCU after circuit proof
Code lookup
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Sources and review
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- OBDII.pro: P1587 Ford definition
live reference page (obdii.pro)
Supports: Ford-family meaning for P1587: Throttle Control Unit Modulated Command Malfunction
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Last updated 2026-09-06.
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