Transmission Output Shaft Speed Sensor Failure
The transmission output shaft speed sensor is reading a failure condition.
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What it means (plain English)
The output shaft speed sensor measures how fast the transmission's output shaft is spinning. If it fails, the computer can't tell if the transmission is functioning properly.
What the computer is actually seeing
The computer interprets zero or irregular signals from the output shaft speed sensor, typically expected to send a voltage that varies smoothly from 0 to 12 volts depending on the speed.
What a healthy reading looks like
Signal voltage should vary between 0 and 12 volts with transmission speed, with expected output around 1-5 volts when operating normally at moderate speeds.
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 wiring and connector at the output shaft speed sensor for damage or corrosion. Repair if necessary.
- 22. Verify transmission fluid level is correct; fill as needed to the manufacturer's specifications.
- 33. Use a multimeter to measure voltage at the sensor connector while the vehicle is in motion; voltage should range from 0-12 volts; if not, replace the sensor.
- 44. Check for any stored trouble codes; if any other codes related to speed sensors are present, address those first.
- 55. Clear codes and take vehicle for a test drive; if SPN 2476 returns, replace the output shaft speed sensor and retest.
Common causes
- Faulty output shaft speed sensor
- Damaged wiring or connectors
- Low transmission fluid level
- Transmission control module issues
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code active?
No, this code can cause erratic shifting and potential transmission damage, so avoid driving until fixed.
Will the code come back after clearing it?
If there are underlying issues, it likely will return after correcting the cause temporarily.
Why does this code pair with other speed sensor codes?
It typically indicates a broader issue with speed sensing in the transmission, and other sensors may be affecting or affected by this sensor's failure.
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