P0715 on Honda: How to Diagnose & Fix
Input/Turbine Speed Sensor Circuit Malfunction
1 Honda model · 1 documented issue
P0715 on Honda by model: symptoms, diagnosis and fix
The ZF 9HP-based 9-speed automatic fitted to 2020+ Ridgelines uses dog clutches rather than friction packs for some ratio changes. The dog clutch must synchronize gear speeds before it engages, and the PCM cuts engine torque during the event; when the calibration timing drifts the driver feels a hesitation, a lurch, or a hard bang on deceleration. Ridgeline Owners Club threads document harsh shifts while coasting or descending grades, a momentary loss of engine braking on manual 5-4 downshifts, and noticeably poor shift quality until the fluid is warm. This is distinct from the 10-speed programming complaint - it is the 9AT's dog-clutch architecture and cold-fluid behavior.
Common Symptoms
- Hard or banging shift when decelerating or coasting
- Hesitation from a stop or when accelerating from low speed
- Momentary loss of engine braking on manual downshift
- Poor shift quality until fully warmed up in cold weather
- Random or unrequested gear changes
How to Fix
Have the dealer apply the latest TCM/PCM software update - Honda has released multiple recalibrations for this unit and most cases are software, not hardware. A fluid service with the correct ZF-spec Honda ATF (not DW-1) restores shift quality on higher-mileage trucks; many owners service it at 30,000-60,000 miles despite the lifetime-fill claim. Avoid manual downshifts into the dog-clutch gears on grades; use the brake instead. Slipping, flare, or a stored ratio-error code means internal repair or valve body work, which is warranty territory.
Sources for this issue (3)
P0715 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0715 mean on a Honda?
P0715 stands for "Input/Turbine Speed Sensor Circuit Malfunction." P0715 indicates a malfunction in the input/turbine speed sensor circuit of an automatic transmission. This sensor measures how fast the transmission's input (turbine) shaft is rotating, which the transmission control module uses—alongside output speed—to calculate gear ratios and command smooth, properly timed shifts. When the signal is missing, erratic, or out of range, this code sets. Symptoms often include harsh or erratic shifting, incorrect shift points, no speedometer-related transmission data, or the transmission dropping into a limp/fail-safe mode. On Honda it is documented across 1 model: Ridgeline.
What are the most common causes of P0715?
The most common causes of P0715 are: Faulty input/turbine speed sensor, Damaged wiring or connector at the sensor, Low or contaminated transmission fluid, Corroded or loose connector terminals, Open or short in the sensor circuit, Internal transmission wear or debris affecting the sensor, Faulty transmission control module (less common). The specific cause varies by vehicle.
How much does it cost to fix P0715 on a Honda?
Repair costs vary widely with the root cause and Honda model; each issue on this page carries its own estimate where one is published.
Looking for P0715 on a different make?
View P0715 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.