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U1977 Engine Trouble Code

Meaning of U1977 engine trouble code is a kind of network trouble code and U1977 if your catalytic convertor fails completely, you eventually won't be able to keep the car running. Your gas mileage will also be terrible, so you should try and fix it as soon as you can. Unfortunately, the average replacement cost is around $2,140 and you can't do it yourself unless you're an experienced mechanic.

U1977 Fault Symptoms :

Check engine light comes on
Engine stalling or misfiring
Engine performance issues
Car not starting

If one of these reasons for U1977 code is occuring now you should check U1977 repair processes.
Now don't ask yourself; What should you do with U1977 code ?
The solution is here :

U1977 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.

U1977 Code Meaning :

U	1	9	7	7
OBD-II Diagnostic Network (U) Trouble Code For Engine	Fuel And Air Metering	Injector Circuit Malfunction - Cylinders	Cylinder 10 Contribution/balance Fault	Shift/Timing Solenoid Malfunction/ 3-2 Shift Solenoid Circuit Electrical

The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate.

U1977 OBD-II Diagnostic Network (U) Trouble Code Description

U1977 engine trouble code is about Shift/Timing Solenoid Malfunction/ 3-2 Shift Solenoid Circuit Electrical.

Main reason For U1977 Code

The reason of U1977 OBD-II Engine Trouble Code is Injector Circuit Malfunction - Cylinders.

U1977 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.

	Example: 0140