Transmission Input Speed Sensor Range/Performance Problem
The transmission input speed sensor is reporting out of expected range values.
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What it means (plain English)
The transmission's input speed sensor monitors the rotation speed of the input shaft. If it shows a reading that’s too high or too low compared to what the system expects, it means the sensor isn't working correctly or something's wrong with the transmission's operation.
What the computer is actually seeing
The computer is looking at the voltage coming from the input speed sensor which should fluctuate between 0.5 to 4.5 volts depending on the rotation speed. If it sees values outside this range (like below 0.5V or above 4.5V) consistently, it triggers this fault code.
What a healthy reading looks like
Input speed voltage should range from 0.5V to 4.5V under normal operation. Transmission input speed usually reads between 0 to 3000 RPM based on vehicle specifications.
Guided diagnostic — the DiagCoach way
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.
- 11. Check the wiring and connector to the input speed sensor for fraying, corrosion, or loose connections. Repair as necessary. Decision: If wiring is damaged, fix it. If not, proceed to step 2.
- 22. Inspect the transmission fluid level and condition. Low fluid or contaminated fluid can affect sensor readings. Decision: Top off or replace fluid if necessary. If fluid is fine, proceed to step 3.
- 33. Use a scan tool to monitor the input speed sensor data while the vehicle is running. Compare the PID data with expected RPM values. Decision: If the sensor readings are incorrect (not matching expected values), replace the input speed sensor. If readings are normal, suspect TCM issues.
Common causes
- Faulty input speed sensor
- Wiring issues or poor connections
- Transmission fluid issues
- Faulty Transmission Control Module (TCM)
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's best to repair it soon, as it affects transmission performance. You may experience shifting issues.
Will this code come back after clearing it?
If the underlying issue isn't fixed (like a bad sensor or wiring), the code is likely to return.
Why does this code sometimes appear with other codes?
Multiple codes may indicate a common issue affecting the transmission system, like a wiring fault or fluid problem.
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