OBD-II Code
P1706
Severity
Not yet reviewed
Nobody on our side has assessed this code yet, so we are not going to guess at how serious it is.
Can you drive it
We cannot say
Treat it as unknown until a shop reads it with live data. If the check-engine light is FLASHING, stop driving as soon as it is safe to — that means an active misfire, whatever the code.
Indicative cost (USD)
$45–$850
From this code's diagnostic notes. Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
P1706 is a Ford-specific code meaning the PCM saw vehicle speed above the calibrated threshold (typically 5-10 mph) while the Transmission Range Sensor was reporting Park — a physical impossibility that means either the TRS is lying about Park or the VSS/OSS is reporting phantom speed.
How a shop works this
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed.
Note every code that is set, not just this one.
Codes that appear together usually narrow the cause faster than any one of them read alone.
Read the freeze frame — the conditions the fault was recorded under.
Cold or warm, idle or load, road speed and engine speed. A fault that only appears cold is a different fault from one that only appears under load, even with the same code on the scanner.
Confirm the fault is current rather than history.
Clear the code and see whether it returns under those same conditions. A code that does not come back may have been logged during a repair, a flat battery, or a bad connection that has since been disturbed.
Then follow the diagnostic notes further down this page, in the order they are written.
They are written in the order a shop works this code, cheapest checks first. Where they name a component, inspect its wiring and connector before replacing it.
If the code comes back after a repair, the underlying fault is still there. That is the point to bring in a scanner with live data and freeze-frame, or a shop that has one.
Common symptoms
- Check engine light
Read the full diagnostic procedureP1706 is a Ford-specific code meaning the PCM saw vehicle speed above the calibrated threshold (typically 5-10 mph) while the Transmission Range Sens…
P1706 is a Ford-specific code meaning the PCM saw vehicle speed above the calibrated threshold (typically 5-10 mph) while the Transmission Range Sensor was reporting Park — a physical impossibility that means either the TRS is lying about Park or the VSS/OSS is reporting phantom speed.
Cheapest-first ladder
- Scan live data and confirm both TR position and VSS/OSS while driving — if TR shows Park during normal driving you have a TRS signal stuck on the Park step (~0.5V), and that's a sensor or harness problem, not a real concurrent-state event.
- Inspect the shifter cable/linkage adjustment — a stretched or misadjusted shift cable can leave the trans physically in Drive while the cable-actuated TRS lever sits at the Park detent; verify by reaching under and confirming the manual valve lever position matches the column indicator at every gear ($0, 10 min).
- Check TRS voltage steps at the PCM connector (Park ~0.5V, Reverse ~1.2V, Neutral ~2.0V, Drive ~2.8V, 2 ~3.6V, 1 ~4.4V) — if the Park step is normal at standstill but the voltage stays at 0.5V while moving, the sensor's wiper or contact set has failed open.
- Inspect the trans-case bulkhead seal for ATF migration into the harness, which is the most common root cause that pulls the TR signal toward the Park rail. Expensive-misdiagnosis caveat: don't reprogram the PCM or replace the OSS/VSS to chase P1706 — the code's logic is anchored on the TR signal, and 9 out of 10 P1706 tickets are TRS or shift-linkage problems; the speed input is rarely wrong because it's checked against ABS wheel speeds at the CAN bus.
Vehicle-specific patternsAODE/4R70W/4R75W in E150/E250/E350 vans (1996-2014), F150/F250 (1997-2010), Crown Vic Police Interceptor (1996-2011), and Mustang (1996-2010) throws…
- 1996-2014AODE/4R70W/4R75W in E150/E250/E350 vans , F150/F250 (1997-2010), Crown Vic Police Interceptor (1996-2011), and Mustang (1996-2010) throws P1706 from the same TRS contamination path as P1702 — fluid migration up the trans harness onto the TR pins.
- 1996-2003Explorer/Mountaineer with the 5R55E sees P1706 specifically when the MLPS lever's Park-detent contact wears and the wiper hangs at the Park step under road vibration.
- 2011-2020F150 and 2011-2017 Mustang/Expedition with the 6R80 see P1706 from the lead-frame internal harness connector cracking. P1706 also surfaces after a sloppy trans swap when the shifter cable wasn't re-adjusted — verify cable adjustment before opening the trans.
Estimated repair$45 to $850.
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