Pending codes, a type of OBD2 diagnostic trouble code (DTC), can be a source of confusion for car owners. This article will delve into what pending codes are, how they differ from other OBD2 codes, and what you should do if you encounter one.
What are Pending Codes in OBD2?
A pending code, also known as a maturing code, indicates a potential problem detected by your vehicle’s onboard diagnostic system (OBD2). It signals that a specific system or component is not operating within its normal parameters, but the issue hasn’t occurred frequently or severely enough to trigger a confirmed trouble code and illuminate the check engine light. Essentially, it’s a warning sign that a problem might be developing.
Pending Codes vs. Confirmed and Permanent Codes
Understanding the difference between pending, confirmed, and permanent OBD2 codes is crucial:
- Pending Codes: As discussed, these represent potential issues that haven’t fully materialized into a problem. They don’t trigger the check engine light.
- Confirmed Codes: These codes indicate a consistent malfunction within a system. Confirmed codes illuminate the check engine light and are stored in the vehicle’s computer memory.
- Permanent Codes: Introduced more recently, these codes relate primarily to emissions systems. They cannot be cleared with a standard OBD2 scanner and remain stored even after the issue is resolved. The vehicle’s computer will automatically clear a permanent code after sufficient driving data indicates the problem is gone. This data is gathered under various driving conditions like idling, stop-and-go traffic, and highway driving.
How a Pending Code Becomes a Confirmed Code
A pending code transitions to a confirmed code when the malfunction occurs repeatedly or under specific conditions predetermined by the vehicle’s manufacturer. For instance, a temperature sensor might have an acceptable operating range, but if the reading consistently falls outside the optimal range for a certain number of drive cycles or a specific duration, the pending code will mature into a confirmed code, triggering the check engine light.
What to Do If You Have a Pending Code
While a pending code doesn’t necessarily require immediate action, it shouldn’t be ignored. Using an OBD2 scanner, you can identify the specific pending code and research its meaning. This allows you to:
- Monitor the situation: Keep an eye on the pending code to see if it clears itself or becomes a confirmed code.
- Address potential problems early: Investigating a pending code can help you identify and fix minor issues before they escalate into more significant and costly repairs. For example, a pending code related to a slightly loose gas cap can be easily resolved, preventing potential evap system problems down the line.
- Perform preventative maintenance: A pending code might highlight the need for routine maintenance, such as replacing worn spark plugs or a clogged air filter.
Conclusion
Pending Codes Obd2 provide valuable insight into the health of your vehicle. While they don’t always indicate an immediate problem, understanding and monitoring them can help you prevent future issues, save money on repairs, and ensure your vehicle runs smoothly. Using an OBD2 scanner to regularly check for pending codes is a proactive approach to car maintenance.
