Output Speed Sensor No Signal
The output speed sensor detects transmission output shaft rotation and sends a signal to the PCM for shift timing and speedometer operation. Code P0722 sets when the PCM receives no signal or a missing signal from this sensor, preventing proper transmission control and speed calculation.
What You Might Notice
- Check Engine Light illuminated
- Transmission does not shift or shifts roughly
- Poor fuel economy
- Speedometer shows incorrect or erratic reading
- Engine enters limp mode
Most Common Causes
- 1
Defective Output Speed Sensor
The sensor itself has failed and cannot generate a signal. This is the most common cause and requires sensor replacement.
- 2
Corroded or damaged connector or wiring
Poor electrical connections, corroded terminals, or damaged wiring harness prevents signal transmission to the PCM. Inspect all connections and repair as needed.
- 3
Dirty or contaminated transmission fluid
Debris in the fluid can interfere with sensor operation or clog the sensor pickup. Fluid replacement and filter service may restore function.
- 4
Defective Transmission Valve Body or Solenoid
Internal transmission component failure or faulty shift solenoid can disrupt normal transmission operation and signal pathways.
How to Diagnose It
- 1
Check Defective Output Speed Sensor — The sensor itself has failed and cannot generate a signal. This is the most common cause and requires sensor replacement.
- 2
Check Corroded or damaged connector or wiring — Poor electrical connections, corroded terminals, or damaged wiring harness prevents signal transmission to the PCM. Inspect all connections and repair as needed.
- 3
Check Dirty or contaminated transmission fluid — Debris in the fluid can interfere with sensor operation or clog the sensor pickup. Fluid replacement and filter service may restore function.
- 4
Check Defective Transmission Valve Body or Solenoid — Internal transmission component failure or faulty shift solenoid can disrupt normal transmission operation and signal pathways.
How to Fix It
- 1
Replace Output Speed Sensor
Remove the defective output speed sensor from the transmission and install a new one. Ensure proper seating and torque specifications are met.
- 2
Inspect and repair wiring and connectors
Check the sensor wiring harness for damage, corrosion, or loose connections. Clean corroded terminals with electrical contact cleaner and repair or replace damaged wiring.
- 3
Change transmission fluid and filter
Drain and refill the transmission with fresh fluid and replace the transmission filter to remove debris that may interfere with sensor operation.
- 4
Diagnose transmission control issues
If sensor replacement and fluid service do not resolve the code, use a scanner to test sensor signal under driving conditions and check for internal transmission faults requiring professional transmission repair.
Need a deeper diagnosis?
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