Incorrect Input to Output Speed Sensor Range
This code indicates a speed sensor reading out of expected range.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The transmission is trying to determine how fast it's spinning but is getting a reading that's too high or low, which can mess up shifting.
What the computer is actually seeing
The transmission control module (TCM) expects certain voltage inputs from the output speed sensor based on vehicle speed and engine RPM. If it sees a reading that is too low (like below 0.5 volts) or too high (above 4.5 volts) when it should be within 1-2 volts under normal operation, this code is triggered.
What a healthy reading looks like
The output speed sensor should provide a signal between 0.5 to 4.5 volts; at idle, it might read close to 1.0 volts, increasing with speed.
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 output speed sensor wiring and connector for damage or corrosion. Decision: If damaged, repair or replace the wiring; if fine, proceed to step 2.
- 22. Measure the output speed sensor signal voltage at idle. Expected: 1.0 volts. Decision: If outside of 0.5-4.5 volts, replace the output speed sensor; if within limits, proceed to step 3.
- 33. Inspect the transmission fluid level and condition. Decision: If low or burnt, change the fluid and retest; if normal, proceed to step 4.
- 44. Use a scan tool to check if there are other related codes present. Decision: If other codes are present, diagnose those issues first; otherwise, proceed to step 5.
- 55. Check the TCM for any updates or faults. Decision: If TCM faults recorded, consider TCM recalibration or replacement.
Common causes
- Bad output speed sensor
- Wiring issues (shorts or opens)
- Faulty transmission control module (TCM)
- Mechanical issues in the transmission
- Fluid level too low or fluid quality issues
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's drivable but can lead to erratic shifting or transmission damage if not addressed soon.
Will the code come back after clearing it?
If the underlying issue isn't fixed, it will likely return after a short time.
Why does this code pair with P0790?
Both codes relate to speed sensor issues; one could be a symptom of the other.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
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