B3991 Engine Trouble Code
Meaning of B3991 engine trouble code is a kind of body trouble code and theoretically you can drive for a few weeks or even months with a broken MAF sensor. You will notice a decrease in gas mileage and over time the car will eventually start stalling a lot. At a shop, the replacement cost is between $240-$400 depending on the car, but that's usually the cost of parts because the labor is relatively simple.
B3991 Fault Symptoms :
If one of these reasons for B3991 code is occuring now you should check B3991 repair processes.
Now don't ask yourself; What should you do with B3991 code ?
The solution is here :
B3991 Possible Solution:
Power Steering Pressure (PSP) Switch Malfunction In Key On, Engine Off Self-Test, this DTC indicates the PSP input to the PCM is high. In Key On, Engine Running Self-Test, this DTC indicates that the PSP input did not change state. Steering wheel must be turned during Key On, Engine Running Self-Test PSP switch/shorting bar damaged SIG RTN circuit open PSP circuit open or shorted to SIGRTN PCM damaged.
B3991 Code Meaning :
|OBD-II Diagnostic Body (B) Trouble Code For Engine||Ignition System Or Misfire||Injector Circuit Malfunction - Cylinders||Crankshaft Position Sensor A Circuit Malfunction||Crankshaft Position Sensor A Circuit Low Input|
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.
B3991 OBD-II Diagnostic Body (B) Trouble Code DescriptionB3991 engine trouble code is about Crankshaft Position Sensor A Circuit Low Input.
Main reason For B3991 CodeThe reason of B3991 OBD-II Engine Trouble Code is Injector Circuit Malfunction - Cylinders.
B3991 code on vehicles with electronically controlled automatic transmissions, the 3-4 shift solenoid is responsible for actuating the hydraulic circuits to activate clutches or bands that change gears inside the automatic transmission.