Engine light on and truck is shaking

Hi,

If the check engine light was flashing, that normally indicates a misfire. By any chance, do you know the codes that AutoZone found?

As far as fuel pressure, if it is too high or too low, it can cause a misfire, but I don't believe there is a code just for the fuel pump. Usually, you will find a lean or rich fuel mixture code.

If you want, here is a link that explains how to test fuel pressure. You can try it to see if there is a problem.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Here are the manufacturer's specifications:

2017 Dodge or Ram Truck RAM 1500 Truck 4WD V6-3.6L
Fuel Delivery System - Pressure Specifications
Vehicle Powertrain Management Fuel Delivery and Air Induction Fuel Pump Fuel Pressure Specifications Pressure, Vacuum and Temperature Fuel Delivery System - Pressure Specifications
FUEL DELIVERY SYSTEM - PRESSURE SPECIFICATIONS
FUEL SYSTEM PRESSURE-GAS
58 psi +/- 2 psi

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If possible, let me know what codes were found. If you have other questions, let me know.

Take care and God Bless,

Joe

Okay, the P0300 indicates a random cylinder misfire. As far as the temperature gauge, that could be part of the issue. If the ECT (eng coolant temperature sensor) is faulty, it could be causing an issue with the air/fuel mixture sent to the engine.

If your scan tool can provide live data, see what the ECT indicates. If the engine is cold, the temperature should be close to the outside ambient temperature.

Do that and let me know what it says.

Joe