C1391 Engine Trouble Code

When you check engine light came on code C1391 the reason should be . However your vehicle's manufacturer may have a different definition for the C1391 OBD-II Diagnostic Chassis (C) Trouble Code. So you should chech it on our car models.

When the DTC check engine light comes C1391 code on the first you can check is the gas related maybe gas cap. Pull over, retighten it, and take a look at the cap to see if it has any cracks inside. Go on driving and to see if the check engine light turns off automaticly. On the other hand, you can buy a gas cap for about $4.5 at an auto parts store. All you need to do is take the old one take off and take on the new one. If you've already bought it to the store, you might as well just replace the cap. While not car-threatening, it's good to take care of this right away to improve gas mileage/km.

C1391 Code Meaning :

The oxygen (02) sensors on your car measure the oxygen in the exhaust to determine how rich or lean the ratio of fuel and air are in the cylinders. Optimizing this mixture means better fuel economy and fewer exhaust emissions.

C1391 OBD-II Diagnostic Chassis (C) Trouble Code Description

C1391 engine trouble code is about Glow Plug/Heater Circuit 'A' Malfunction. Fuel Rail Pressure Sensor Circuit Malfunction and Cylinder 4 Contribution/Balance Fault causes most of code C1391.

Reason For C1391 Code

The reason of C1391 OBD-II Engine Trouble Code is Fuel Rail Pressure Sensor Circuit Malfunction.

C1391 the main thing to check is to verify the operation of the VCT solenoid in the engine. You're looking for a sticking or stuck VCt solenoid valve caused by contamination. Refer to vehicle specific service repair manual to perform component tests for the VCT unit.

How To Repair C1391 Code

Before starting let's see C1391 repairing process steps:

• Qualified technicians will begin by using a scan tool to access C1391 code stored in the ECU.
• Technicians will note C1391 code present and any freeze frame data associated with them.
• After all, if you sure the engine trouble is finished, the code will be cleared.

The transmission uses hydraulic pressure, controlled by solenoids, which are controlled by the PCM, to shift gears and provide torque converter lockup. The PCM calculates the necessary amount of pressure at any given time to optimize vehicle operation.

If nothing is done to repair the persistent C1391 code, the ECU will put the vehicle into a limp mode. This mode limits the top speed and reduces engine power greatly to protect the engine.

Sometimes C1391 code comes with C139100 code.

Diagnosis Of Engine Error OBD Code C1391

It's essential to diagnose this trouble code. Then are some way which a handyperson should follow for diagnosing the problem that started a C1391 trouble code to be stored

The first step is introductory and is about reacquiring all the canons that have been set. For this, the individual scanner will have to be plugged into the individual harborage of your vehicle. Make sure you indurate frame the data. Any canons that were set previous to the C1391 code will have to be sorted first, as they may have been the reason for the law to set in the first place. It's always good to rule that out.

The coming step is to run a introductory examination of all the electrical circuits, connectors, wiring etc for damages similar as becks, erosion, fraudulent legs etc. All of these will have to be repaired or replaced. After that's sorted, clear the canons and go on a test drive to see if it resets. In case it resets, you'll have to continue your opinion. Depending on your vehicle you may have a vacuum operated selector or a vacuum solenoid if it's electrically actuated. In the case of the former, a hand held vacuum pump will have to be used to testit.The purpose is to see if the internal stopcock is getting turned by the selector, motor or solenoid. In order to do this, a command can be transferred to the system with scanner or by driving the vehicle under the special conditions that will spark the system. While this is passing keep an eye on the checkup tool data for the result.