I posted this in another thread, same rules apply here.
Detailed trouble code descriptions give information as to what the computer is seeing that it does not like. This is critical in forming a diagnostic strategy. Also, some trouble codes are caused by a failure of a part not listed in the trouble code.
I'll use a coolant temp sensor as an example ( I'm not saying that this is what is wrong with your car. )
Here are 7 generic OBD2 trouble codes related to the coolant temp sensor. Not all codes are used on every car.
Quote:
P0115 Engine Coolant Temperature Sensor Circuit 1 Malfunction
P0116 Engine Coolant Temperature Sensor Circuit 1 Range/Performance Problem
P0117 Engine Coolant Temperature Sensor Circuit 1 Low Input
P0118 Engine Coolant Temperature Sensor Circuit 1 High Input
P0119 Engine Coolant Temperature Sensor Circuit 1 Intermittent
P011A Engine Coolant Temperature Sensor 1/2 Correlation
P011B Engine Coolant Temperature/Intake Air Temperature Correlation
Read more at: https://www.obd-codes.com/p01-codes
Copyright OBD-Codes.com
|
P0116 could be caused by a stuck open thermostat or low coolant.
P0117 could be caused by the sensing wire being pinched to ground
P0118 could be caused by the sensing wire being broken , tied to power or bad plug contact.
P011B could be caused by an intake air sensor problem or someone leaving a trouble light next to the battery to keep it warm ( if the intake air temp sensor / intake duct is near by it will see a temp above engine temp. )
Somewhere in a factory shop manual there will be a detailed code description. This gives clues as what to test to perform. For coolant temp I'd be hanging a volt meter or scope on the coolant temp sensor wire and watching it.