Output Speed Sensor No Signal (P0722)
The P0722 code indicates that the transmission control module (TCM) has detected no signal from the output speed sensor, which monitors the rotational speed of the transmission output shaft. This sensor is critical for proper shift timing, torque converter lockup, and speedometer operation. The lack of signal can be due to a faulty sensor, damaged wiring, or internal transmission issues.
01. Most Common Causes
- Faulty output speed sensor
- Damaged or corroded wiring/connector
- Internal transmission mechanical failure
- Low transmission fluid level or contamination
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Erratic or no speedometer reading
- Harsh or delayed shifting
- Transmission stuck in limp mode (e.g., 2nd gear only)
03. Step-by-Step Diagnosis
Step 1: Scan for codes and verify P0722 is present.
Step 2: Inspect output speed sensor wiring and connector for damage or corrosion.
Step 3: Test sensor resistance and AC voltage output while rotating the output shaft.
Step 4: Check transmission fluid level and condition.
Step 5: If sensor and wiring are good, inspect the tone wheel or reluctor ring for damage.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as the transmission may shift erratically or fail to shift, potentially causing further damage. Limp mode may limit speed and drivability.
How much does it cost to fix?▼
Replacing the output speed sensor typically costs $50-$150 for parts and labor. If wiring repairs or transmission work is needed, costs can be higher.