Output Speed Sensor Intermittent Signal
The P0723 code indicates that the powertrain control module (PCM) has detected an intermittent or erratic 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. An intermittent signal can cause harsh or delayed shifts, incorrect speed readings, and may trigger limp mode.
01. Most Common Causes
- Faulty output speed sensor
- Damaged or corroded wiring/connector
- Metal debris or contamination on sensor tip
- Intermittent electrical connection
- Damaged tone wheel or reluctor ring
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Erratic or no speedometer reading
- Harsh or delayed transmission shifts
- Transmission stuck in limp mode or fails to shift
- Cruise control inoperative
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Inspect output speed sensor wiring and connector for damage, corrosion, or loose pins.
Step 3: Test sensor resistance and AC voltage output while rotating the drive wheels.
Step 4: Check for metal debris on sensor tip and inspect tone wheel for damage.
Step 5: Clear codes and test drive to verify if the issue returns.
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 enter limp mode, potentially causing further damage.
How much does it cost to fix?▼
Replacing the output speed sensor typically costs $50-$150 for parts and labor, depending on vehicle make and model.