Error Code P1093 is defined as Fuel Rail Pressure Too Low.
This error code is a manufacturer-specific trouble code, meaning it does not apply to all cars makes. Rather, it applies only to specific 2012 Chevrolet Colorado 4wd-crew-cab makes, such as Isuzu, Chevrolet, BMW, Volkswagen/Audi, and Subaru. Specification of the definition, troubleshooting, and repairs still vary from one make and model to another.
Error Code P1093 is set because the fuel rail pressure is low. Meaning, there’s a problem in the fuel pressure relief valve. This is quite a common problem among diesel engines.
The valve is a small plug at the end of the driver’s side fuel rail. When this valve gets hot, the start to open is a bit too soon and will set this code.
As with other error codes, this code activates the Check Engine light and registers the code to your 2012 Chevrolet Colorado 4wd-crew-cab’s memory system. In some cases, your 2012 Chevrolet Colorado 4wd-crew-cab may lose power
Many factors may contribute to this code, such as:
Technicians usually start their diagnosis of this code by checking the fuel filter. If the fuel filter is clogged, then it must be cleaned or replaced.
Then, technicians will proceed to check leakage in the fuel system.
Then, they will check the fuel injector and fuel pump, before checking the fuel rail pressure sensor if it’s working properly, or receiving the correct voltage.
Since a blocked fuel filter is the common cause of this problem, then cleaning or replacing your fuel filter can fix the problem. Other repairs, of course, include repairing or replacing components to prevent fuel system leakage.
For some 2012 Chevrolet Colorado 4wd-crew-cab makes and models, such as Chevrolet Duramax, a simple and quick solution can be done with the use of a shim that will hold the pressure back.