Check engine light is on?

Get the code. could be fuel pump but maybe the idle air control.

Check out his CAN scan video

https://youtu.be/InIlnsjOVFA

the code will give us a direction

Roy

Ok, still need the code and the fuel pressure needs to be checked.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Roy

Most new vehicles and most good scantools are CAN capable !

The Diagnostic Methods Section provides information on routine diagnostic tasks.
When following powertrain diagnostics on vehicles with on board diagnostics (OBD), the system may be checked by an off-board tester referred to as a scan tool. This part contains information for carrying out diagnostics with a scan tool. A scan tool has certain generic capabilities that are standard across the automotive industry in the United States and Canada. All functions are selected from a menu. Refer to the instruction article provided by the tool manufacturer.

High Speed Controller Area Network (CAN)
High speed CAN is a serial communication language protocol used to transfer messages (signals) between electronic modules or nodes. Two or more signals can be sent over one CAN communications network circuit allowing 2 or more electronic modules or nodes to communicate with each other. This communication or multiplexing network operates at 500kB/sec (kilobytes per second) and allows the electronic modules to share their information messages.
Included in these messages is diagnostic data that is outputted over the CAN + and CAN - lines to the DLC. PCM connection to the DLC is typically done with a 2-wire, twisted pair cable used for the network interconnection. The diagnostic data such as self-test or PIDs can be accessed with a scan tool. For additional information on scan tool equipment, refer to DIAGNOSTIC METHODS.

Check engine light on

https://www.2carpros.com/articles/service-engine-soon-or-check-engine-light-on-or-flashing

Have the computer scanned for code/s-you have a problem within the engine management system that caused the CEL to turn on-This is your starting point of diagnosis,finding out what's going on.

Have the computer scanned for code/s-you have a problem within the engine management system that caused the CEL to turn on-This is your starting point of diagnosis, finding out what's going on.

P0171

1. Vacuum leaks
2. EGR and PCV valve.
3. Low fuel pressure.
4. Dirty fuel injectors.
5. Mass Air Flow Sensor.

Misfire codes

1. Defective spark plug.
2. Inadequate spark/coil, defective spark plug wire.
3. Lack of compression
4. False air leakage.
5. Faulty fuel injectors.
6. Insufficient fuel pressure.
7. Contaminated fuel.
8. EGR valve that is leaking.
9. Oxygen sensors.

Check engine light means there is a trouble code(s) that has been stored in the vehicle's computer system. You need to retrieve the trouble code(s). Most auto part stores will do this for your for free, or you can purchase a diagnostic scanner and do it yourself. Post the code(s) you get and we can further assist you with the problem.

Take the vehicle to a good autoparts store (autozone etc.) have them scan the computer(PCM) for codes (most do this free) .. repost with the codes for a better diagnosis and repair advice ..

You'll need to have the vehicles' computer scanned for fault codes so I can assist you better. Most retail auto parts suppliers will scan for free. Find out what the code is and get back to me. TY

The only way your going to get it off is to resolve the issue that put it on in the first place. You can go to Autozone and they will clear the computer but if the problem is not satisfactorily resolved, it will just come back on again.