Transmission Output Speed Sensor Failure
The transmission output speed sensor is reporting a failure.
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 output speed sensor measures how fast the output shaft of the transmission is spinning. If it fails, the computer won't know the vehicle speed, which can affect shifting and speedo readings.
What the computer is actually seeing
The Engine Control Module (ECM) sees a constant or non-variable voltage signal from the transmission output speed sensor when it should see a changing voltage based on vehicle speed.
What a healthy reading looks like
A functioning sensor should output a varying voltage signal, typically between 0.5V and 5V depending on speed and operation. Ideally, you should see at least 2V at idle and up to 5V at road speed under load.
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 connectors for the transmission output speed sensor. Look for damage, corrosion, or loose connections. Decision: Are the connections good? If yes, go to step 2; if no, repair or replace connectors.
- 22. Verify the transmission fluid level and condition. Ensure fluid levels are within the normal range and fluid is not burnt or contaminated. Decision: Is the fluid okay? If yes, proceed to step 3; if no, change fluid and retest.
- 33. Measure the output voltage from the transmission output speed sensor while the vehicle is idling using a multimeter. Decision: Is the voltage within the expected range? If yes, the sensor may be OK; continue checking the TCM; if no, replace the speed sensor and recheck.
Common causes
- Faulty transmission output speed sensor
- Damaged wiring or connectors to the sensor
- Faulty transmission control module (TCM)
- Low transmission fluid levels or dirty fluid
- Corrosion on electrical connectors
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Moderate severity means it’s not ideal to drive long distances as transmission performance may be affected, but you can drive short distances to a shop if necessary.
Will this code come back after clearing?
If the underlying issue isn't fixed (like a bad sensor or wiring), yes, it will likely return.
Why does it seem to pair with other speed sensor codes?
This sensor's failure can disrupt transmission operation, affecting other related sensors or systems, leading to multiple codes being triggered.
Working a real vehicle right now?
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