U1391 Engine Fault Code

Check Solution For U1391 OBD Code :

U1391 engine code seems a kind of network problem, we try to show one by one the meaning and the solution.
Brief explanation of the U1391 code and definition of U1391 is the bottom side.

U1391 Meaning :

u Network Code
Problem is climate control system, lighting, airbags, etc.
1 MFG - Manufacturer Specific
3 BBV Sensor Circuit Low Voltage
9 BBV Sensor Circuit Low Voltage
1 Transmission

MFG - Manufacturer Specific codes, which have a '1' as their second digit to indicate they are unique to a particular vehicle make or model. These special codes were deemed necessary by the vehicle manufacturers so they could provide additional diagnostic information beyond the basic list of generic OBD II codes for all kinds of faults, not just emissions-related faults.

How To Fix U1391 ?

The valves of each cylinder are kept closed using a pair of arms that replace the conventional engine's roller-type rocker arm. U1391 code one of these arms follows the cam profile while the second arm connects to the valves. During normal engine operation the two arms are joined by a locking pin.

U1391 Code Description:

The poor running symptoms are consistent with a MAP sensor malfunction. In addition, in some cases, a bad MAP sensor will not throw a code. Again, the ELD code likely represents a separate wiring issue. When you see U1391 engine fault code on your engine code reader this description will help you.

U Codes List of all Network codes.

Final Step: In the definitions listed below, there is a test drive recommended after you've completed any repairs to see if the condition is fixed. Before you take a test drive after a repair, always erase the U Code(s) first. This will turn the check engine light off and then you will know if the check engine light returns, you've got further diagnostics to complete.

BE CAREFUL !
This engine code information is presented for information purposes only. This is not intended as repair advice and we are not responsible for any actions you take on any vehicle.

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