Whats the difference between stored codes and pending codes?

Asked By: Procopio Kerispe | Last Updated: 30th January, 2020
Category: automotive auto repair
4.6/5 (6,449 Views . 24 Votes)
For a quick answer though, the difference between stored and pending codes is simple. Stored codes are put in place from the manufacturer to signal the computer when a common fault is detected. Pending codes are codes that prep themselves when they determine a fault that engine cycle.

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Moreover, what is a stored code?

Active codes (aka STORED codes) are live codes or malfunctions that are keeping your Check Engine Light on. Just because your Check Engine Light is off doesn't mean the code or malfunction disappeared, it just means that the code setting conditions haven't occurred for two or more operations of the vehicle.

Additionally, do pending codes clear themselves? Each throws a very distinct code which will not shut itself off until the issue is fixed. If the condition that caused it to come on is a minor fault, and stops occurring, then yes, it will clear itself. If the condition indicates a larger problem, then it will stay on until cleared manually.

Subsequently, one may also ask, what does a pending code mean?

Active codes are live codes or malfunctions that are keeping your Check Engine Light on. Pending codes mean that the OBD-II monitoring system has failed the operation of an emission control system at least once and if it fails again the Check Engine Light will be turned on and the malfunction becomes an Active code.

How do you read codes?

The best way I've ever discovered to read and understand someone else's code is to:

  1. Find one thing you know the code does, and trace those actions backward, starting at the end. Say, for example, you know that the code you're viewing ultimately creates a file with a list of movie titles.
  2. Rinse and repeat.

33 Related Question Answers Found

How do you clear a permanent code?

To clear the Permanent DTC using a dedicated monitor cycle, start by repairing the fault that caused the DTC in the first place. Then clear all the codes except for the permanent DTC (if it were that easy, there'd be no problems), and make sure the Permanent DTC is the only one left.

What are u codes?

Network & Vehicle Integration (U-codes) category covers functions that are shared among computers and systems on the vehicle.

How do you read a engine code without a scanner?

How to Retrieve Car Trouble Codes With No Equipment
  1. Insert the key into the ignition. Turn the car on and off quickly, ending with the key in the "On" position.
  2. Watch the "Check Engine" light on the dash. Once the sequence has been initiated, the "Check Engine" light begins to flash.
  3. Record the codes as they flash.

What does DTC 01 mean?

DTC 01 General Sensor Fault.

What does OBD stand for?


On-Board Diagnostics

Are check engine codes stored?

Resetting your check engine light
In some cars, the code is stored in the computer system, even if the light isn't illuminated.

What are the codes for check engine light?

The letter “P” indicates powertrain-related codes such as those involving the engine or the transmission and their sensors. Typically, “P” codes are the only ones that will illuminate the Check Engine Light. The letter “B” indicates a body code, which means that it relates to a body system such as the airbags.

Can I pass inspection with a pending code?

Answer: A pending trouble code should not cause your vehicle to fail the smog check. The smog test process (for 2000 & newer vehicles) relies on your vehicle's computer having determined an emission fault being present or not; this being indicated by an illuminated (ON) check engine light or malfunction indicator lamp.

How long does it take for OBD to reset?

There may in fact be nothing wrong with the vehicle; the computer simply needs to complete its checks. One week of combined highway and city driving is normally enough to reset the system and provide an accurate reading of vehicle performance.

Can you tell if codes have been cleared?

There really i no way of knowing if codes have been cleared. If you get lucky and have a good scanner, (Modis, Autel, etc.) you may be able to locate history codes. If you are looking to purchase a vehicle, ask the seller to allow you to road test the vehicle.

How can I tell if my check engine light has been reset?

Press Read or Enter on the scanner depending on the scanner model that you have. Scroll down to I/M Readiness menu and select it. Look at all the systems. If most of them say NOT READY, it means the check engine light was recently reset.

What are the data trouble codes?

DTC's, or Diagnostic Trouble Codes, are used by automobile manufacturers to diagnose problems related to the vehicle. The first number in the DTC indicates whether the code is an SAE generic code (applies to all OBD-II systems) or is specific to the vehicle manufacturer.

What is a permanent trouble code?

A Permanent Diagnostic Trouble Code (DTC) is stored when a DTC is confirmed and the Malfunction Indicator Lamp (MIL) has been illuminated. A Permanent DTC can only then be cleared by the module strategy and cannot be erased by clearing DTCs with a scan tool, a Keep-Alive Memory (KAM) reset, or battery disconnect.

Can you pass emissions after clearing codes?


To pass an OBD-II emissions test, a vehicle must:
If you clear the 'Check Engine' light, or reset the OBD-II monitors right before your emissions test, your vehicle typically will not pass because the catalyst and EVAP monitors need time to run. If it's not in a "ready" state, your vehicle will automatically fail.

What is a warm up cycle?

A warmup cycle is defined as a trip that includes a change in engine temperature of at least 40ºF and where it reaches 160ºF.

How do you reset a check engine?

To do this, insert your key into the ignition, turn the vehicle on for about a second, and then off for about a second. Repeat this two more times then drive the car as normal. Check to see if the check engine light reset.