Output Speed Sensor Circuit Malfunction
Fix P0720 transmission output speed sensor code. Learn how it affects shifting and the speedometer.
Transmission Issues
Symptoms
- 1Check engine light on
- 2Erratic or harsh shifting
- 3Speedometer inaccurate or not working
- 4Transmission stuck in one gear
- 5Vehicle in limp mode
Common Causes
- 1Failed output speed sensor
- 2Damaged wiring or connector
- 3Low or dirty transmission fluid
- 4Connector corrosion
- 5TCM fault (rare)
How to Fix
- 1Check transmission fluid level and condition
- 2Inspect the sensor connector and wiring
- 3Test the sensor's signal output
- 4Replace the output speed sensor if faulty
- 5Scan for additional transmission codes
What Does P0720 Mean?
The P0720 code indicates a problem with the output speed sensor circuit in the automatic transmission. This sensor measures the rotational speed of the transmission output shaft.How It's Used
The TCM compares output speed with input speed to calculate gear ratios and control shift timing. The output speed signal also frequently feeds the speedometer.Common Causes
A failed sensor, damaged wiring, or low transmission fluid affecting the sensor are typical causes. Connector corrosion is also common.Using AI4Car
AI4Car can display live transmission output speed data, helping you confirm whether the sensor signal is present and accurate.Related Codes
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