Transmission Output Speed Sensor Fault
The transmission output speed sensor is reporting an erroneous reading.
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 output speed sensor measures how fast the transmission output shaft is turning. If it's faulty, the computer gets a weird signal and can’t figure out what gear you're in or how fast you're moving.
What the computer is actually seeing
The transmission control module expects to see a signal voltage between 0.5V and 4.5V from the output speed sensor depending on the speed. If the signal is outside this range or absent, it throws SPN 5412.
What a healthy reading looks like
Expected voltage from the output speed sensor should vary from 0.5V to 4.5V as the vehicle speed changes. At 0 RPM, it should be close to 0.5V.
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.
- 1Check the wiring and connectors to the output speed sensor for damage or corrosion.
- 2Verify the transmission fluid level is correct and the fluid is not burnt or contaminated.
- 3Using a multimeter, check the signal voltage at the output speed sensor. It should be between 0.5V and 4.5V. If not, proceed to the next step.
- 4If the voltage is correct, test the output speed sensor by swapping it with a known good one if available, or check resistance and response with a scan tool.
- 5If the speed reading is still erroneous after testing, consider checking or replacing the TCM.
Common causes
- Bad transmission output speed sensor
- Damaged wiring or connector to the sensor
- Faulty transmission control module (TCM)
- Poor fluid level or quality in the transmission
Typical repair cost
$$ - $$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's best to fix it soon as it can affect shifting and performance.
Will this code come back after I clear it?
If the underlying issue isn't fixed, the code will likely return.
Why does this code pair with others?
Faulty sensors can cause multiple codes to be thrown, especially in the transmission system.
Working a real vehicle right now?
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