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Rock Sam

Rock Sam 5/7/2018

2008 Hummer H3 Base 5 Cyl 3.70L


What does P0715 OBD-II Trouble Code stands for and what are its causes? How do I fix the Turbine Speed Sensor Circuit?

1 Answer

Parts avatar

Parts avatar 5/7/2018

What the P0715 code means?

P0715 is an OBD-II generic code for a signal error between the engine control module (ECM) and the automatic transmission control module (TCM). If the code is present, the input speed sensor does not detect the engine's (turbine) revolution speed and receives the wrong signal, failing to shift gears in accordance to the manufacturer's parameters.

What causes the P0715 code?

Defective Input/Turbine Speed Sensor

Defective Shift Solenoids

Defective Engine Coolant Temperature Sensor

Defective Valve Body

Dirty transmission fluid that restricts the hydraulic passages

What are the symptoms of the P0715 code?

Harsh or erratic transmission shift points

Failure of the transmission to shift

Decreased fuel efficiency

Speedometer (odometer) fluctuation

Common mistakes when diagnosing the P0715 code?

Mistakes range from attempting to diagnose this type of code as a vehicle speed malfunction, an internal
transmission problem, an engine misfire, fuel delivery problem, or a driveline malfunction. Technicians
report that unnecessary vehicle speed sensor replacement is the result of one particularly common misdiagnosis.

What repairs can fix the P0715 code?

Replacing the input speed sensor

Repairing damaged wiring for the input speed sensor


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