Code
P0716
GWM
P — Powertrain
- Invalid indicator / turbine speed sensor not adjusted
AI status
Completed
Completed
100%
Causes
- Faulty turbine (transmission input) speed sensor
- Incorrect sensor air gap or misadjusted sensor position
- Damaged or corroded connector or wiring (open, short to ground or power, high resistance)
- Bad reluctor ring (missing, damaged, or contaminated)
- Contaminated sensor (fluid, debris) or magnetization loss
- Faulty transmission control module (TCM) / engine control module (ECM) or software issue
Symptoms
- Malfunction indicator lamp (MIL) illuminated
- Transmission shift irregularities, harsh or delayed shifts
- Transmission may stay in limp mode or reduced functionality
- Unexpected gear ratios or slipping sensation under load
- Possible inability to accelerate smoothly
What to check
- Read freeze frame and full DTC list; note conditions when P0716 set
- Compare live data: turbine (input) speed vs engine RPM and output/wheel speed
- Inspect sensor connector and harness for damage, corrosion, or water ingress
- Visually inspect reluctor ring for damage or missing teeth
- Measure sensor resistance and output signal with oscilloscope or multimeter per factory specs
- Check sensor air gap and mounting/adjustment against service manual
Signal parameters
- Type: either variable-reluctance (VR) AC sine or Hall-effect/square-wave (depends on vehicle)
- VR amplitude: typically 0.5–8 V AC at low-to-moderate speeds (varies by application)
- Hall/square: 0–5 V square wave referenced to vehicle ground
- Frequency: proportional to turbine speed (low hundreds of Hz at low RPM; increases with speed)
- Expected behavior: clean waveform with consistent amplitude/frequency proportional to engine/transmission speed; no dropouts
Diagnostic algorithm
- Retrieve code and freeze-frame data; note vehicle conditions (cold, hot, gear, speed).
- With scan tool, monitor turbine/input speed, output speed, and engine RPM while stationary and during a controlled road test. Look for mismatches or dropouts.
- Visually inspect sensor, connector, and wiring harness at the transmission for damage, corrosion, or loose pins. Repair as needed.
- If wiring looks good, backprobe connector and observe sensor signal with oscilloscope (preferred) or multimeter. Verify waveform type and amplitude per service data.
- If signal missing or erratic, check continuity to TCM and for short to ground/power. Repair wiring harness faults.
- Verify sensor air gap and mounting position against manufacturer specification; adjust or reposition per service manual if adjustable.
- Inspect reluctor ring/gear for damage, missing teeth, or metal debris; replace if defective.
- Replace the sensor if out of specification or physically damaged. Clear codes and perform relearn/adaptation procedures if required.
- Recheck for codes and road test to confirm repair. If problem persists, consider TCM/ECM diagnosis or internal transmission inspection.
Likely causes
- Sensor not installed/adjusted to specified air gap
- Sensor electrical connector corroded or loose
- Sensor failed (common failure point)
- Reluctor ring damaged or missing teeth
- Intermittent wiring fault due to chafing or pinched harness
Fault status
Status
Transmission input (turbine) speed sensor signal out of range or invalid; sensor may be misadjusted, faulty, or wiring/reluctor problem. MIL set.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
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