OBD Engine Codes And Warning Lights, Are Only A Messenger
9= SAE Reserved
Because, it is simply doing it’s very important job. For example, letting you know that your vehicle, isn’t operating at top efficiency. Most people think, the check engine light (CEL), is only there for the vehicle’s emission system.
P0400-P0499 – Auxiliary Emissions Controls. Above all, these are the famous (EVAP) system codes.
First, there was (OBD)-I, first generation diagnostic codes. Now, we have (OBD)-II, second generation diagnostic codes.
P0300-P0399 – Ignition System or Misfire. So, if there was a bad spark plug or faulty coil you would see one of these codes.
0= SAE Reserved
Finally, Codes-4th and 5th, these digits are variable, and relate to a specific problem.
P0100-P0199 – Fuel and Air Metering. So, these will be things like the mass airflow sensor and throttle body.
However, they can’t provide a clear cut solution, to the actual cause of the problem. Because, warning lights, are only a messenger.
In short, when this system identifies an issue, it turns on a warning light and records, OBD engine codes.
P0700-P0999 – Transmission Codes. Finally, simply lets the driver know that there is a fault in the transmission computer. And, the (TCU) needs to be scanned for OBD engine codes.
So, now you have a better idea, of what makes up, a Diagnostic Trouble Code (DTC). And, you can see that, every digit has its purpose. Also, you know which system, is having the problem. Consequently, just by knowing what the first few digits are.
P0200-P0299 – Fuel and Air Metering (Injector Circuit). Consequently, these codes would be for things involving the fuel injectors.
So, OBD engine codes, are accessed by using a code reader, into the vehicle’s (OBD) port. Consequently, these codes provide you with, the information about the system. And, the conditions under which, the issue was first identified.
P0500-P0599 – Vehicle Speed Controls and Idle Control System. Furthermore, the idle air control valve and (VSS) would fall under this category.
So, OBD Engine Codes and Warning Lights, are the language your car uses, to communicate with you.
P0600-P0699 – Computer Output Circuit. As a result, sometimes these types of codes point to a faulty computer.
Then, with only a few basic tools, a little patience and some mechanical aptitude. Most often, you can find and repair most of these concerns yourself.
So, How Do You Read The OBD Engine Codes !
Firstly, the first character identifies the system, related to the trouble code.
P = (Powertrain)
B = (Body)
C = (Chassis)
U = (Network Communication)
Secondly, the second digit identifies, whether the code, is generic , or a manufacturer specific code.
(same on all OBD-II equipped vehicles).
0 = (Standardized Code ISO/SAE) Generic (this is the digit zero — not the letter “O”)
1 = (manufacturer specific OBD engine codes)
While, the third digit, denotes the type of sub system, that pertains to the Engine Code:
(Secondary Air Injection System) Emission Management (Fuel or Air)
(Fuel System) Injector Circuit (Fuel or Air)
( Ignition System) or Misfire
(Exhaust Monitoring System) Emission Control
(Idle Speed Control) Vehicle Speed
(ECU) Computer & Output Circuit
However, this light informs the operator, when there is something wrong anywhere in the vehicles, electronic engine control system.
The OBD Engine Codes System, Basically Includes:
So, OBD Engine Codes, or Warning Lights, cannot be fixed, by simply resetting it or disconnecting the battery.
Eventually, the OBD Engine Codes, and the dreaded Warning Light, will come back! But, stay cool, the warning light, is only a messenger.
Consequently, your vehicle needs these and many more, to operate properly. So, to troubleshoot, repair and maintain your vehicle, you’ll need diagnostic repair information, that is specific to your vehicle.