P0717

Code

GWM P — Powertrain

- No signal from the turbine speed sensor

Brand: GWM

Type: P — Powertrain

Views: UK: 29 EN: 55 RU: 77

AI status

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Page language: EN

Causes

Open or shorted wiring between turbine speed sensor and control module
Poor or corroded connector/terminal at sensor or harness
Failed turbine (input) speed sensor (Hall or VR type)
Damaged or missing reluctor/trigger ring or damaged tone wheel teeth
Faulty reference power or ground to the sensor
Faulty transmission control module (rare) or intermittent software/firmware fault

Symptoms

Malfunction Indicator Lamp (MIL)/Check Engine light lit
Transmission may enter limp mode or default shift strategy
Harsh, delayed or erratic shifting; missing gears
Torque converter lockup may be disabled or unstable
Incorrect odometer/speedometer not typical (vehicle speed uses different sensor)
Possible poor fuel economy or drivability issues

What to check

Read and record freeze-frame and live data for turbine speed (input) and compare to engine RPM and output speed sensors
Inspect sensor connector and wiring for corrosion, pins pushed out, chafing, or damage
Visually inspect reluctor/tone wheel on transmission input shaft for missing or damaged teeth and for debris
Backprobe sensor connector: check reference voltage (if Hall-style), ground continuity, and signal while cranking/rolling
Measure sensor output with a multimeter (AC for VR type) or oscilloscope (recommended) while rotating input shaft
Check continuity/resistance of sensor circuit to control module and inspect for shorts to battery or ground

Signal parameters

Sensor types: Hall-effect (digital square wave) or variable reluctor (VR, AC sine/triangle)
Hall: typical signal: 0–5 V square wave (some systems use 0–12 V depending on vehicle); edges correspond to tooth passage
VR: AC voltage increases with shaft speed; low speed produces low mV, rising to volts at higher rpm
Frequency: proportional to turbine/input shaft speed — low Hz at idle, increases with engine/transmission speed (use service manual for exact Hz per tooth count)
Recommended measurement: use a lab scope to confirm waveform shape, amplitude and frequency; multimeter may not show intermittent or waveform faults

Diagnostic algorithm

Connect an OBD-II scanner, read P0717 and other related codes; record freeze-frame data and live turbine speed reading.
Visually inspect sensor and harness at transmission for damage, corrosion, oil intrusion or broken wires; secure connectors and repair obvious defects.
Backprobe the sensor connector: with ignition ON (engine OFF), verify reference voltage (Hall sensor) and good ground. If missing, trace and repair supply/ground circuits.
With transmission input shaft rotated (or road test while monitoring), measure signal at sensor: VR sensor = AC voltage; Hall sensor = square wave 0–5 V. Preferably use an oscilloscope to confirm waveform integrity and tooth count.
If no signal at sensor but wiring has correct reference/ground, disconnect sensor and measure its resistance (compare to service spec). If open/short or out of spec, replace sensor.
If sensor output present at sensor but absent at control module connector, check continuity to PCM/TCM and repair wiring; inspect for shorts to 12V or ground.
Inspect reluctor/tone wheel for damage, missing teeth or debris; repair or replace as needed.
If wiring and sensor check good and signal absent at module input, suspect TCM/PCM input circuit fault — verify with wiring diagrams and consider module bench tests or replacement.
After repairs, clear codes and road test while monitoring turbine, output and vehicle speed sensor data to confirm proper operation and that code does not return.

Likely causes

Wiring open/failure or connector corrosion (most common)
Failed turbine speed sensor element
Damaged reluctor ring or foreign debris preventing pickup
Ground or reference voltage loss at sensor
Less likely: TCM internal failure

Fault status

⚠️ Status

No turbine (input) speed sensor signal detected. TCM may use default shift strategy; MIL illuminated. Investigate sensor, wiring, connectors, and tone wheel.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

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P0717 — - No signal from the turbine speed sensor