Output Speed Sensor No Signal
P0722 means Output Speed Sensor No Signal. Learn the likely symptoms, common causes, and a safe diagnostic order before replacing parts.
What you may notice
Symptoms
- 01Check Engine or transmission warning light
- 02Harsh, delayed, missing, or incorrect shifts
- 03Transmission fail-safe or limp mode
- 04Speedometer or cruise-control issues on speed-sensor faults
Where to look first
Common causes
- 01Sensor, solenoid, range-switch, or internal harness fault
- 02Low, contaminated, overheated, or incorrect transmission fluid
- 03Connector corrosion, damaged wiring, or poor ground
- 04Hydraulic, valve-body, clutch, or internal mechanical problem
A sensible sequence
Best diagnostic order
- 01Read transmission-module codes and save freeze-frame data
- 02Verify fluid level, condition, temperature, and visible leaks
- 03Inspect wiring and test the affected sensor, switch, or solenoid circuit
- 04Compare input speed, output speed, commanded gear, and actual ratio
- 05Verify the repair during a controlled road test
Step by step
What to check and repair
- 01Check fluid level and condition using the manufacturer procedure
- 02Inspect the transmission connector and external wiring
- 03Compare commanded gear, speed signals, temperature, and solenoid state
- 04Perform circuit, hydraulic, and mechanical tests before major repair
Read the signals
Live-data clues
Input and output speed
- Typical behavior
- Signals should be stable and consistent with vehicle speed and selected gear
- Possible clue
- A missing or erratic signal can cause incorrect ratio or shift decisions
Commanded gear and solenoid state
- Typical behavior
- The actual ratio should follow the commanded gear
- Possible clue
- A mismatch may be electrical, hydraulic, or mechanical
Transmission fluid temperature
- Typical behavior
- The reading should be plausible and change gradually
- Possible clue
- An implausible value can alter shift strategy or indicate a sensor circuit fault
| Parameter | Typical behavior | What it can suggest |
|---|---|---|
| Input and output speed | Signals should be stable and consistent with vehicle speed and selected gear | A missing or erratic signal can cause incorrect ratio or shift decisions |
| Commanded gear and solenoid state | The actual ratio should follow the commanded gear | A mismatch may be electrical, hydraulic, or mechanical |
| Transmission fluid temperature | The reading should be plausible and change gradually | An implausible value can alter shift strategy or indicate a sensor circuit fault |
What P0722 means
P0722 is a generic powertrain diagnostic trouble code defined as “Output Speed Sensor No Signal.” The vehicle control module stored it after the monitored circuit or system failed its expected test. The code identifies the area and failure type; it does not by itself prove that one named component must be replaced.
Diagnostic direction
Transmission codes need electrical, fluid, hydraulic, and mechanical checks in that order. A solenoid or ratio code does not automatically mean the complete transmission has failed.
Before clearing the code
Save stored, pending, and permanent codes plus freeze-frame data. Note the operating condition that set the code, inspect related connectors and wiring, and check vehicle-specific service information. After a verified repair, clear the code only when appropriate and repeat the enabling conditions to confirm that it does not return.