Output Speed Sensor No Signal
The P0722 code indicates that the Powertrain Control Module (PCM) 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 transmission shift timing, torque converter lockup, and speedometer operation. The lack of signal can be caused by a faulty sensor, damaged wiring, or a malfunctioning PCM.
1. Symptoms You Will Notice
- Check Engine Light illuminated
- Erratic or no speedometer reading
- Harsh or delayed transmission shifts
- Transmission may go into limp mode
2. Most Common Causes
- Faulty output speed sensor
- Damaged or corroded wiring/connectors
- Malfunctioning PCM
3. Step-by-Step Diagnosis
Step 1: Scan for additional codes and verify P0722 is present.
Step 2: Inspect the output speed sensor and its wiring for damage, corrosion, or loose connections.
Step 3: Test the sensor's resistance and voltage output using a multimeter.
Step 4: Check the reluctor ring on the output shaft for damage or debris.
Step 5: If sensor and wiring are okay, test the PCM for proper signal reception.
4. 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 go into limp mode, potentially causing further damage.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for parts and labor, depending on the vehicle and shop rates.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.