P1722 Output Speed Sensor Signal Fault
P1722 is a Nissan/Infiniti-specific code indicating a malfunction in the inductive signature of the output shaft speed sensor (also called the revolution sensor). The transmission control module (TCM) detects that the sensor's waveform does not match expected parameters, which can be caused by sensor wear, a damaged tone ring, or signal interference. This fault affects gear ratio calculations and torque converter control.
01. Most Common Causes
- Faulty or worn output shaft speed sensor
- Damaged, worn, or missing teeth on the output shaft tone ring
- Short circuit, open circuit, or abnormal resistance in sensor wiring
- Corroded, oxidized, or loose pins in the sensor connector
- Electromagnetic interference in the sensor circuit
- Internal TCM failure
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Harsh or erratic shifting
- Transmission slipping or stuck in limp mode
- Poor acceleration or reduced fuel economy
03. Step-by-Step Diagnosis
Scan for codes and verify P1722 is present
Inspect sensor connector and wiring for damage, corrosion, or loose connections
Test sensor resistance and AC voltage output while rotating the output shaft
Check tone ring for damage or missing teeth through the sensor hole or by removing the sensor
If sensor and wiring are good, suspect TCM failure
1. Frequently Asked Questions
Is it safe to drive?▼
You can drive short distances, but the transmission may shift poorly or enter limp mode. Continued driving could cause further damage, so it's best to diagnose and repair promptly.
How much does it cost to fix?▼
Replacing the output speed sensor typically costs $100–$300 including parts and labor. If the tone ring is damaged, repair costs can range from $500–$1500. TCM replacement is more expensive, often $800–$1500.