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C1791 Engine Trouble Code

Meaning of C1791 engine trouble code is a kind of chassis trouble code and when your car's 'C1791 Check Engine' light comes on, it's usually accompanied by a sinking feeling in the pit of your stomach. The light could mean a costly problem, like a bad catalytic converter, or it could be something minor, like a loose gas cap. But in many cases, it means at minimum that you'll be visiting the car dealer to locate the malfunction and get the light turned off.

C1791 Fault Symptoms :

  1. Check engine light comes on
  2. Engine stalling or misfiring
  3. Engine performance issues
  4. Car not starting
If one of these reasons for C1791 code is occuring now you should check C1791 repair processes.
Now don't ask yourself; What should you do with C1791 code ?
The solution is here :

C1791 Possible Solution:

C1791 Engine

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.

C1791 Code Meaning :

C 1 7 9 1
OBD-II Diagnostic Chassis (C) Trouble Code For Engine Fuel And Air Metering Fuel Rail Pressure Sensor Circuit Malfunction Crankshaft Position Sensor A Circuit Malfunction Crankshaft Position Sensor A Circuit Low Input

Is the fuel pump sometimes not priming when you turn the key to ON(II)? Start by measuring the fuel pressure and checking whether you have bright white-bluish spark at all four plugs. The mechanical timing is also something that you should check, as we mentioned above.

C1791 OBD-II Diagnostic Chassis (C) Trouble Code Description

C1791 engine trouble code is about Crankshaft Position Sensor A Circuit Low Input.

Main reason For C1791 Code

The reason of C1791 OBD-II Engine Trouble Code is Fuel Rail Pressure Sensor Circuit Malfunction.

C1791 DTC specifically refers to the camshaft (cam) timing. In this case, if the cam timing is over-retarded, the engine light will be illluminated and the code will be set.