What is CID 630:
CID 630 refers to an issue with the vehicle's transmission system, particularly with the transmission fluid temperature sensor. The ECM detects an out-of-range signal, leading to poor shifting, overheating, or damage to the transmission system.
Why This Happens:
- Faulty transmission fluid temperature sensor.
- Shorted or damaged wiring in the sensor circuit.
- Loose or corroded sensor connectors.
- Malfunctioning transmission affecting fluid temperature.
- ECM misinterpretation of the sensor’s data.
How to Fix It:
- Inspect the transmission fluid temperature sensor for malfunction.
- Test the sensor’s voltage and resistance to verify it’s within specifications.
- Check wiring and connectors for damage or corrosion.
- Replace the faulty sensor if necessary.
- Inspect the transmission system for overheating or poor performance.
How to Avoid It Before It Happens:
- Regularly inspect the transmission fluid temperature sensor and wiring.
- Perform routine transmission system maintenance.
- Keep connectors clean and corrosion-free.
- Perform diagnostic checks to monitor transmission health.
- Clue’s fleet management software helps monitor transmission systems and prevent overheating or performance issues.
