Input/Turbine Speed Sensor Range/Performance Problem

The input or turbine speed sensor measures how fast the transmission input shaft is spinning. If it detects a speed that isn't possible with the current engine and vehicle speed, it triggers this code.

The transmission control module (TCM) looks for an input speed signal within a specific range based on engine RPM and vehicle speed. If the input speed sensor voltage is too high or low or does not match expected values, the code sets.

Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.

1. 11. Check for any visible damage to wiring and connectors at the input speed sensor. Repair any issues found.
2. 22. Verify transmission fluid level and condition. Top off or replace fluid if necessary.
3. 33. Use a scan tool to read live data from the input speed sensor. Expect it to vary smoothly with engine speed. If not, continue to step 4.
4. 44. Disconnect the input speed sensor and measure resistance (ohms). It should read within manufacturer's specifications; usually, a few hundred ohms. If not, replace the sensor.
5. 55. If the sensor checks out, check the signal wire at the TCM for correct voltage output. Pins should show voltage consistent with input speeds. If not, inspect wiring and connectors further before condemning the TCM.

• Faulty input/turbine speed sensor
• Wiring issue (broken or shorted wire)
• Faulty transmission control module (TCM)
• Fluid level too low or contaminated transmission fluid
• Mechanical issue in transmission

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