Code
P0716
HUMMER
P — Powertrain
Input Speed Sensor Circuit Intermittent
AI status
Completed
Completed
100%
Causes
- Damaged or corroded sensor connector or wiring (open/short/intermittent contact)
- Faulty input/turbine speed sensor
- Poor or intermittent ground or reference voltage to the sensor (for 3‑wire Hall sensors)
- Intermittent short to power or ground in the harness
- Contamination, fluid intrusion or mechanical damage to the sensor
- Faulty TCM/PCM or intermittent module connection
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated / DTC stored
- Erratic or harsh shifting, late or early shifts
- Transmission may go into limp/limitation mode or default shift strategy
- Incorrect or fluctuating input speed reading in live data
- Stall speed and torque converter lock‑up irregularities
What to check
- Read and record DTC(s) and freeze frame/failure counts with scan tool
- Record live data: input (turbine) speed and output speed while revving and during road test
- Inspect transmission harness, connector and sensor for corrosion, damage or fluid intrusion
- Wiggle harness and connector while watching live data for intermittent changes
- Compare input speed sensor signal to output speed sensor signal and expected vehicle speed
- Check TCM/PCM grounds and battery voltage under load
Signal parameters
- Sensor type may be 2‑wire VR (alternating AC signal) or 3‑wire Hall (5V reference, ground, signal) depending on vehicle
- Hall sensor expected: 0–5 V square wave (signal switches between ~0 V and ~5 V) and consistent frequency proportional to turbine RPM
- VR sensor expected: AC sine/alternating waveform with amplitude increasing with input RPM (low amplitude at idle, several volts at higher rpm)
- Resistance (two‑wire VR) typically in the hundreds to low thousands of ohms — compare to OEM spec
- Signal frequency should increase smoothly with engine/transmission speed; intermittent dropouts or noise indicate a fault
Diagnostic algorithm
- Verify fault: connect a scan tool, note MIL and any related codes, check freeze frame and occurrence counts
- Visual inspection: disconnect battery, inspect input sensor connector and wiring for corrosion, bent pins, chafing, or damage; repair as needed
- Backprobe the sensor connector and with key on (engine off) verify reference (if 3‑wire) and ground are present and stable
- With engine running or transmission driven (safe support/hoist recommended), monitor sensor signal with an oscilloscope or high‑speed scan tool: look for consistent waveform or square wave and no dropouts while varying speed
- Perform wiggle test of wiring and connector while watching live data/oscilloscope to reproduce intermittent behavior
- Measure sensor resistance (for VR) and compare to OEM spec; replace sensor if out of spec or open/short
- Check for shorts to power/ground and continuity between sensor connector and TCM connector; repair damaged wiring or pins
- If wiring and sensor test good, inspect TCM connectors and grounds; if intermittent persists and wiring is good, consider TCM/PCM diagnosis or replacement following OEM procedures
- After repairs, clear codes and perform road test to confirm fault does not return
Likely causes
- Corroded/loose connector at the transmission harness
- Broken or chafed wiring where harness flexes
- Failed input speed sensor (common failure)
- Intermittent ground or pinched wire near transmission
Fault status
Status
P0716 — Input/Turbine (Input) Speed Sensor Circuit Intermittent. The transmission input speed sensor signal is intermittently missing or erratic; may cause incorrect shift behavior or limp mode.
Repair difficulty: Medium
Diagnostic time: 0.5-3.0 hours
Repair manuals
Manual library for HUMMER
138
Browse 138 HUMMER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
HUMMER
-
HUMMER: 2009
-
HUMMER: 2008
-
HUMMER: 2007
-
HUMMER: 2005
-
HUMMER: 2004
-
HUMMER: 2000
-
HUMMER: 1999
-
HUMMER: 1994
-
HUMMER: 1993
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email