P0715 Transmission input or turbine shaft speed sensor circuit fault

Input/turbine speed sensor circuit

P0715 in short

P0715 means the transmission computer is not getting a usable signal from the input (turbine) shaft speed sensor. The sensor, its wiring or an internal wiring frame is the usual fault, but some makers fix it with software or internal repairs. Have it inspected soon, and check for a recall or bulletin first.

The input or turbine speed sensor reads how fast the shaft coming out of the torque converter turns. The transmission computer compares it with engine and output speed to choose gears, time shifts and check for slipping. When the signal is missing, erratic or implausible, it sets P0715.

Without that signal the transmission may shift harshly, stay in one gear or drop into a backup (limp) mode. On Ford 6R80 transmissions the sensor sits on a molded wiring frame inside the transmission, and owners of 2015–2017 F-150s and a 2018 Transit report dealers finding that frame at fault.

Other fixes are vehicle-specific. Ford has bulletins for 2015–2016 Edge, Explorer, Flex and Taurus (an internal clutch and tone wheel) and for 2020 Super Duty trucks, and Nissan has one for the 2022 Pathfinder. A VIN check for recalls and bulletins is the cheapest first step.

Most likely causes

  1. Turbine speed sensor in the internal wiring frame (Ford 6R80: 2015–2017 F-150, Transit)

    Supported by vehicle data
    Why it ranks here
    Owners quote Ford dealers confirming a turbine speed sensor or molded leadframe failure with P0715 and P0717 on these 6R80 vehicles.
    What would change this
    Rises on a 6R80-equipped F-150 or Transit with P0717 also stored, a wrench light and limp mode.

  2. Faulty input/turbine speed sensor

    Common general cause
    Why it ranks here
    The sensor itself is the first cause trade references list, and failed speed sensors give the harsh, missing or sudden shifts that go with this code.
    What would change this
    Rises if the input speed reading drops out on a scan tool while engine speed stays steady.

  3. Damaged wiring or corroded connector in the sensor circuit

    Common general cause
    Why it ranks here
    Speed sensor circuits are checked for power, ground, pinched wiring and connector corrosion before parts are replaced.
    What would change this
    Rises if wiggling the harness changes the reading or corrosion is found at the connector.

  4. Direct clutch cylinder or tone wheel (2015–2016 Ford 6F50/6F55)

    Supported by vehicle data
    Why it ranks here
    Ford lists P0715 with no reverse, 3rd and 5th gear on some early-2016 builds and points at the direct clutch cylinder and tone wheel the sensor reads.
    What would change this
    Rises on a 2015–2016 Edge, Explorer, Flex or Taurus built between November 2015 and February 2016 with no reverse.

  5. Transmission computer software (2020 Ford Super Duty 10R140, 2022 Nissan Pathfinder)

    Supported by vehicle data
    Why it ranks here
    Ford and Nissan have bulletins for P0715 on these vehicles that send them to the dealer rather than straight to a sensor.
    What would change this
    Rises on these models when P0715 is the only code and the sensor tests good.
    How to test the transmission control module (tcm)

What to test first

Start at step 1. Each result tells you what it means and where to go next.

  1. Read codes from the engine and transmission modules with a scan tool that supports both, before anything is cleared.

    Low riskTool: scan tool that reads the transmission module

  2. Check for open recalls and P0715 bulletins for your VIN at a dealer or on the NHTSA site.

    Low risk

  3. Have a shop watch input and engine speed on a scan tool during a road test, then check the sensor connector and wiring.

    Best left to a shopTool: scan tool with transmission data

    Warning:Shop test. Watching live data while driving needs a second person, and wiring checks follow the maker's procedure.

Symptoms

  • Check engine light, often with a wrench light on Fords
  • Harsh or erratic shifting
  • Sudden downshift into a low gear at speed Gets more serious: stop and have it checked.
  • Transmission stuck in one gear or reduced power (limp-home mode) Gets more serious: stop and have it checked.

How to fix

  1. Do not clear the code before the transmission module has been read.

  2. Ask a dealer whether your VIN has an open recall, program or P0715 bulletin. Ford and Nissan have issued them.

Parts and cost context

  • Transmission control module (TCM):Do not replace the transmission computer for P0715 unless a test points to it. The usual fixes are the sensor, its wiring or internal wiring frame, or a bulletin repair.

Labor varies by vehicle and shop; get a quote before you approve a repair.

Compare used part prices on PartPriceGuide

On your vehicle

Ford

  • 2015–2017 · F-150

    Supported by vehicle data

    Owners report P0715 and P0717 with a wrench light, limp mode or sudden downshifts, and a Ford dealer confirmed a turbine speed sensor fault on one truck. Ford recalled these years for unintended downshifts from the transmission wiring frame (26V-237), though the recall does not name P0715. This comes from owner complaints to NHTSA that quote a shop or dealer readout, so it is labelled vehicle data rather than confirmed.

    Where it is:Inside the 6R80 transmission, on the molded leadframe

  • 2015–2016 · Edge

    Supported by vehicle data

    Ford SSM 50861 covers some 6F50/6F55 Edge, Explorer, Flex and Taurus built November 2015 to February 2016 with no reverse, 3rd and 5th gear and P0715. The bulletin is on NHTSA, but whether it is still current is not verified, so it is labelled vehicle data rather than confirmed.

  • 2020 · F-250 Super Duty

    Supported by vehicle data

    Ford TSB 20-2393 covers 2020 Super Duty trucks with the 10R140 built on or before 21 September 2020 that lack power with P0715. The bulletin is on NHTSA, but whether it is still current is not verified, so it is labelled vehicle data rather than confirmed.

  • SSM 50861Status unverified

    No reverse, 3rd and 5th gear with P0715, P0717, P0756 and/or P2701

    2015–2016edge, explorer, flex, taurus · issued · NHTSA 10214492

    Some 2015–2016 6F50/6F55 vehicles built 2 November 2015 to 1 February 2016 may have no reverse, 3rd or 5th gear with these codes, possibly from the direct clutch cylinder and tone wheel. Only the NHTSA flat-file summary was reviewed, not the bulletin itself.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • TSB 20-2393Status unverified

    10R140 lack of power with MIL or wrench lamp and P0715, P0716, P0717 and/or P07C0

    2020f-250, f-350, f-450-sd, f-550-sd · issued · NHTSA 10183419

    Some 2020 Super Duty trucks with the 10R140 built on or before 21 September 2020 may lack power with these codes. Only the NHTSA flat-file summary was reviewed, not the bulletin itself.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • TSB-07-21-11Status unverified

    6F50 output or turbine shaft speed sensor codes and/or harsh engagements

    2007–2008escape, taurus, taurus-x · issued · NHTSA 10032244

    Some 6F50 vehicles with P0715, P0717, P0720, P0721 or P0722, or harsh engagements, are covered. Only the NHTSA flat-file summary was reviewed, not the bulletin itself.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • 9805014Status unverified

    Check engine light with turbine or output shaft speed sensor codes

    1999expedition, f-150, f-250 · issued · NHTSA 613034

    Covers 1999 trucks with a check engine light and turbine shaft speed codes P0715–P0718 or output shaft speed codes P0720–P0722. Only the NHTSA flat-file summary was reviewed, not the bulletin itself.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

Nissan

  • 2022 · Pathfinder

    Supported by vehicle data

    Nissan NTB22-030 applies when the "Service AT Power Reduced" warning shows and P0715 is the only code. The bulletin is on NHTSA, but whether it is still current is not verified, so it is labelled vehicle data rather than confirmed.

  • NTB22-030Status unverified

    "Service AT Power Reduced" warning with P0715 stored in the TCM

    2022pathfinder · issued · NHTSA 10213688

    Applies when the warning has been displayed and P0715 (input speed sensor A) is the only code stored. Only the NHTSA flat-file summary was reviewed, not the bulletin itself.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • P0717No signal from the transmission input or turbine speed sensor

    Shares causes Supported by vehicle data

    P0717 is the no-signal version of the same sensor fault. Ford bulletins and owner readouts list both together.

  • P0720Transmission output shaft speed sensor circuit fault

    Same system Possible — needs testing

    P0720 is the matching fault on the output shaft speed sensor. Some Ford bulletins cover both sensors.

  • P0721Transmission output shaft speed sensor signal out of its expected range

    Same system Possible — needs testing

    P0721 is an output speed sensor range fault; Ford 6F50 bulletins list it with P0715.

All Transmission codes

P0715 questions

Is it safe to drive with P0715?

Have it inspected soon. If the transmission suddenly drops into a low gear at speed or the wheels lock, pull over and get it towed or checked before driving on.

Is the speed sensor always the problem?

No. On Ford 6R80 trucks the sensor is part of an internal wiring frame, and some Ford and Nissan bulletins point to software or internal parts. Check for a bulletin before buying a sensor.

Sources and review

  1. P0715 — Input/Turbine Speed Sensor "A" Circuit — Kelley Blue Book
  2. NHTSA complaint 11388858: 2016 Ford F-150, P0715 sudden downshift — NHTSA Office of Defects Investigation
  3. Cal. Code Regs. Tit. 13, § 1968.2 — Malfunction and Diagnostic System Requirements (OBD II) — California Air Resources Board (via Cornell LII)
  4. Ford recalls 1.39 million F-150s for unintended transmission downshift (NHTSA 26V-237) — TFLtruck (read via tfltruck.com)
  5. April 2026 Ford recall for unintended transmission downshift affecting 1,392,935 vehicles — Bizzycar (read via bizzycar.com)
  6. NHTSA complaint 11681679: 2018 Ford Transit, P0715 leadframe — NHTSA Office of Defects Investigation
  7. NHTSA complaint 11764463: 2016 Ford F-150, P0715 and 26N04 — NHTSA Office of Defects Investigation
  8. Tranny Problems: On the Outside Looking In — MOTOR Magazine ,
  9. Ford SSM 50861: 6F50/6F55 no reverse, 3rd and 5th gear with P0715, P0717, P0756 and/or P2701 — Ford Motor Company ,
  10. Ford TSB 20-2393: 10R140 lack of power with MIL/wrench and P0715, P0716, P0717 and/or P07C0 — Ford Motor Company ,
  11. Nissan NTB22-030: "Service AT Power Reduced" warning and DTC P0715 stored in the TCM — Nissan North America ,
  12. Ford TSB 07-21-11: 6F50 OSS/TSS codes P0715, P0717, P0720, P0721, P0722 and/or harsh engagements — Ford Motor Company ,
  13. Ford 98-05-014: check engine light with turbine and output shaft speed sensor codes — Ford Motor Company ,
Last reviewed
Written by
Saurabh K.
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