P1706
High Vehicle Speed Observed in Park
Findings, check these first
- Failing speed sensor reporting phantom speed
- Electrical noise on the speed circuit
- Chafed speed wiring shorting intermittently
- Failing instrument cluster backfeeding speed
- PCM input fault
Standard procedure
- Graph the speed signal in Park for phantom readings
- Inspect speed wiring for chafing
- Check for noise sources and bad grounds
- Test the speed sensor
- Repair wiring or replace the sensor
Code lookup
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Sources and review
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- OBDII.pro: P1706 Ford definition
live reference page (obdii.pro)
Supports: Ford-family meaning for P1706: High Vehicle Speed Observed in Park
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Last updated 2026-09-06.
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