OBD-II Code
P1700
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)
$250–$4,800
From this code's diagnostic notes. Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
$250 (clean case-pass-through connector + Mercon V flush + reseal) to $4,800 (full 6R80 valve body + torque converter + fluid + labor).
P1700 in the Ford definition is the umbrella code the TCM (or PCM on integrated-transmission-control vehicles) sets when it detects a transmission fault but can't isolate which solenoid, sensor, or hydraulic circuit is actually at fault — it's a parent code that usually appears alongside more specific P07xx / P17xx codes and indicates the TCM has commanded transmission limp-home (locked in 2nd or 3rd gear, no torque-converter lockup) until the root-cause code can be addressed.
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 procedureP1700 in the Ford definition is the umbrella code the TCM (or PCM on integrated-transmission-control vehicles) sets when it detects a transmission fa…
P1700 in the Ford definition is the umbrella code the TCM (or PCM on integrated-transmission-control vehicles) sets when it detects a transmission fault but can't isolate which solenoid, sensor, or hydraulic circuit is actually at fault — it's a parent code that usually appears alongside more specific P07xx / P17xx codes and indicates the TCM has commanded transmission limp-home (locked in 2nd or 3rd gear, no torque-converter lockup) until the root-cause code can be addressed.
Cheapest-first ladder
- Pull ALL TCM codes, not just P1700 — a Ford with P1700 will almost always have 2-5 other transmission codes that point at the actual failure (shift solenoid A/B/C, TCC solenoid, EPC pressure, line-pressure switch, OSS/TSS speed sensors). The P1700 is the report-card; the specific codes are the gradebook.
- Drop the pan and check the fluid — burned/varnished fluid is a clutch-pack failure (transmission rebuild), metallic glitter is hard-part failure (rebuild or replacement), milky pink fluid is a leaking transmission cooler / radiator letting coolant in (catastrophic; both transmission and engine cooling system need attention).
- Scan live data — TSS / OSS rpm at idle in gear, current gear-commanded vs. actual, line pressure command vs. measured EPC duty cycle.
- Inspect the TCM connector and the case-pass-through connector at the transmission for green corrosion — Ford 4R70W / 4R75W / 6R80 valve-body connectors are notorious for ATF wicking up the wires and corroding the TCM pins; cleaning the connector resolves P1700 + a stack of solenoid codes in maybe 30% of cases. Don't drop the transmission or recommend a rebuild before reading KAM for unauthorized-tune flags — aggressive shift-firmness tunes (SCT, Livernois, 5-Star) can flag P1700 if the tune is mismatched to the transmission's actual hardware revision.
Vehicle-specific patterns1996-2008 Ford F-150 / Expedition / Mustang / Crown Vic with the 4R70W / 4R75W 4-speed automatic is the canonical P1700 — the case-pass-through conne…
- 1996-2008Ford F-150 / Expedition / Mustang / Crown Vic with the 4R70W / 4R75W 4-speed automatic is the canonical P1700 — the case-pass-through connector wicks ATF, corrodes, and the TCM reads garbage from multiple solenoids simultaneously; clean the connector, replace the gasket-style seal, refill with Mercon V, and the code stack often clears without rebuild.
- 2011+Ford F-150 / Mustang / Explorer / Expedition with the 6R80 6-speed sees P1700 from valve-body solenoid wear around 100-140k miles (especially the shift solenoid C); valve body rebuild is $1200-1800 installed.
- 2013+Ford Focus / Fiesta with the DPS6 Powershift dual-clutch is a notorious P1700 generator and these transmissions were subject to multiple Ford extended-warranty programs and a class-action settlement — check VIN coverage before quoting.
- 2008-2010E-150/E-250 vans with 4R75W see P1700 from the same case-connector pattern as the trucks.
Estimated repair$250 (clean case-pass-through connector + Mercon V flush + reseal) to $4,800 (full 6R80 valve body + torque converter + fluid + labor).
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