C0300 or p0300?

 

C0300

 

C0300 is for the rear propshaft speed sensor, which is located on the transfer case for rear wheel drive vehicles. Unless you have a modified Impala with a rear wheel drive setup, something isn't right. What method did you use to scan the code and did you visually confirm it was C0300?

Unless there's something else going on, suspect a faulty speed sensor. Are you getting any other warning lights on the dash? ABS or anything like that?

 

You can take it to an auto parts store and they will scan it for you no charge. You don't have to buy parts from them, either. That would verify the code .

 

I'm thinking my scanner is inadequate to handle the job I'll have my brother use his much better scanner and see what we come up with I'll keep you guys updated thanks everybody for the replies

 

Good luck bro i have spent alot of money tring to figure this out and still at and still have have the problem

 

C0300 is a generic CHASSIS code. It's not a code that has to do with smog or such. Different manufacturers use it slightly different from others. Most scanners don't cover them.

Examples.

On 4x4 GM's it can mean the propeller shaft's engagement timing. Or not. But that's not chassis.

On Impalas it can mean the gas cap is loose, or spark plugs fouled, both of which also have P (Powertrain) codes. But it's not chassis.

This code is poorly documented. It's really important to observe clearly and to make a plan of attack. Forget the code. Even delete the code and see what happens. In the end it's going to be like the old days. By hand.

Another tactic is to suspect maybe a software keying error where P0300 was intended but C0300 was entered. Bug report would not catch it.