Transmission Output Speed Sensor Failure
Output speed sensor is reporting erroneous data.
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 your transmission is turning. If it's not working right, it can cause shifting problems or incorrect speed readings.
What the computer is actually seeing
The ECU expects a signal indicating the output shaft speed, typically between 0-5000 RPM. If the signal is inconsistent or outside this range, a fault is detected.
What a healthy reading looks like
Output speed should be between 100-4000 RPM during normal operation, with a reliable signal frequency of 0.5 to 12 volts.
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 for damage or corrosion. Repair or replace as necessary. Decision: If good, proceed to step 2; if bad, fix it and retest.
- 22. Verify transmission fluid level; it should be within the specified range. Decision: If low, top it off and retest; if good, proceed to step 3.
- 33. Test the output voltage at the sensor connector; it should be between 0.5 to 5 volts at idle. Decision: If outside range, replace the sensor; if within range, proceed to step 4.
- 44. Use a scan tool to check for additional faults or memory codes. Decision: If related codes present, troubleshoot those; if none, consider possible ECU issues.
Common causes
- Wiring issue between the sensor and ECU
- Faulty output speed sensor
- Fluid contamination affecting sensor operation
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not recommended to drive long distances, but you might be able to drive short distances carefully while troubleshooting.
Will this code come back?
If the underlying issue remains unfixed, the code will likely reappear after clearing.
Why does it pair with SPN 591 or SPN 592?
These codes are related to transmission system performance and can indicate additional faults in the speed sensor circuit.
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