High Vehicle Speed in Park (Ford)
What does P1706 mean?
The P1706 code means the vehicle's onboard diagnostic system has detected: High Vehicle Speed in Park (Ford). This is a moderate severity code.
Common Symptoms
- Check Engine Light on
- Speedometer showing speed while in Park
- Transmission shifting issues
- Torque converter lockup problems
- Incorrect fuel economy readings
Probable Causes (Ranked by Likelihood)
- Faulty vehicle speed sensor (VSS) Very High
- Transmission range sensor reading Park when actually in Drive High
- Wiring issue between VSS and PCM Moderate
- PCM internal speed signal processing error Low
Step-by-Step Diagnostic Procedure
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With the vehicle in Park and engine running, check the scan tool for vehicle speed reading. Should be 0 MPH.
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If speed shows while in Park, check the transmission range sensor position reading on the scan tool.
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Inspect the vehicle speed sensor connector for corrosion or electromagnetic interference.
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Test the VSS output signal with a multimeter or oscilloscope to verify it is not generating a false signal.
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Check the TRS adjustment and shift cable to ensure Park is properly detected.
Frequently Asked Questions
How can the vehicle show speed in Park?
Either the VSS is sending a false signal, or the TRS incorrectly reports Park when the transmission is actually in gear. The PCM flags this contradiction.
Is this a dangerous condition?
If the TRS is misreading, the transmission may not be fully in Park even though the shifter indicates it. Ensure the parking pawl is engaged before leaving the vehicle.
Could electrical noise cause a false speed signal?
Yes. Aftermarket accessories wired near the VSS or PCM can create electromagnetic interference that mimics a speed signal.