OBD-II Code · Transmission
P0715
Input/Turbine Speed Sensor Circuit
Severity
high
Left alone, this one tends to take other parts with it.
Can you drive it
Not for long
Driving on this one risks further damage. Get it to a shop rather than carrying on with it.
Indicative cost (USD)
$150–$500
Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
Input shaft speed sensor fault.
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 work the likely-causes list in the order shown.
That order is what a shop checks first for this code — wiring and connections before the component they run to, because a connector costs nothing to inspect and is a common answer.
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
- Harsh shifts
- Limp mode
Likely causes
- Failed sensorMost common
- Wiring
- Metal on sensor
Read the full diagnostic procedureP0715 means the TCM isn't getting a valid signal from the Input/Turbine Speed Sensor — the sensor that reads how fast the torque converter's turbine…
P0715 means the TCM isn't getting a valid signal from the Input/Turbine Speed Sensor — the sensor that reads how fast the torque converter's turbine shaft is spinning on its way into the gearset. The TCM compares input shaft RPM against engine RPM to calculate torque converter slip, and against output shaft RPM to calculate actual gear ratio; lose the input signal and the TCM loses its ability to detect slip, manage line pressure, or verify shift completion, so it defaults to limp mode (usually locked in 3rd or 4th with no torque converter lockup). Before pulling any pan, check fluid level and condition first — a low-fluid condition can aerate the pump and produce intermittent speed-sensor signals that look identical to a failed sensor.
Then scan live data
with the trans in DRIVE at idle, input shaft RPM should read within 50-100 RPM of engine RPM (converter unlocked, near-stall). At 45 mph cruise with TCC locked, input RPM should equal engine RPM within 20-50 RPM. A reading of 0 or wildly erratic numbers points to the sensor, its wiring (most common), or the reluctor ring inside the case. External sensor and harness are $80-250 to fix; reluctor ring is a teardown.
Vehicle-specific patterns2004-2010 Ford F-150/Expedition with the 4R75E/4R70W throws P0715 from a failed input speed sensor at the top of the case (driver's side, accessible…
- 2004-2010Ford F-150/Expedition with the 4R75E/4R70W throws P0715 from a failed input speed sensor at the top of the case (driver's side, accessible without dropping the pan) — these go around 90-130k miles, $40 part, 20-minute fix.
- 2006-2012Chrysler 300/Charger/Magnum with the 545RFE/65RFE throws P0715 from the dual input-speed sensors (the 545RFE uses two) when the internal harness connector at the solenoid pack corrodes — a known TSB.
- 2007-2014GM trucks with the 6L80/6L90 use input/output speed sensors integrated into the TEHCM (Transmission Electro-Hydraulic Control Module) inside the pan, so P0715 there means dropping the pan and replacing the TEHCM (~$600 part + 2 hours labor).
- 2009-2015BMW/Dodge with the ZF 8HP rarely throws P0715 unless the internal mechatronic sleeve has leaked into the wiring — when it does, it's a $1,800-2,800 mechatronic rebuild.
Estimated repair$150 (external sensor swap) to $3,000+ (mechatronic on the 8HP).
Look up another code
P0715 — frequently asked
What does a P0715 code mean?
Input shaft speed sensor fault.
What causes a P0715 code?
Common causes: Failed sensor; Wiring; Metal on sensor.
What are the symptoms of a P0715 code?
Typical symptoms: Harsh shifts; Limp mode.
Is it safe to drive with a P0715 code?
Not for long. Driving on this one risks further damage. Get it to a shop rather than carrying on with it. Estimated repair: $150-$500.
How do I diagnose a P0715 code?
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. 1. Note every code that is set, not just this one. 2. Read the freeze frame — the conditions the fault was recorded under. 3. Confirm the fault is current rather than history. 4. Then work the likely-causes list in the order shown.
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