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C3977 Engine Code Repair

Meaning of C3977 engine trouble code is a kind of chassis 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.

C3977 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 C3977 code is occuring now you should check C3977 repair processes.
Now don't ask yourself; What should you do with C3977 code ?
The solution is here :

C3977 Possible Solution:

C3977 Engine

Excessive air inflow can be caused by a vacuum leak, a dirty sensor or, an exhaust gas recirculation valve not closing properly. If the problem is not enough fuel, the culprit may be dirty injectors or fuel filters, a weak fuel pump or a leaky fuel pressure regulator. The lean fuel mix error may be accompanied by rough idling, engine misfires, hesitation during acceleration and overall poor engine performance.

C3977 Code Meaning :

C
OBD-II Diagnostic Chassis (C) Trouble Code For Engine

3
Ignition System Or Misfire

9
Engine Oil Temperature Sensor Malfunction

7
Cylinder 4 Contribution/Balance Fault

7
Ignition Coil A Primary/Secondary Circuit Malfunction

Regarding the C3977 code, it would probably be worthwhile to carefully inspect the wire harness near the intake manifold bracket. This is done most easily from below the car in the area near the oil filter.

C3977 OBD-II Diagnostic Chassis (C) Trouble Code Description

C3977 engine trouble code is about Ignition Coil A Primary/Secondary Circuit Malfunction.

Main reason For C3977 Code

The reason of C3977 OBD-II Engine Trouble Code is Engine Oil Temperature Sensor Malfunction.

Parts or components should not be replaced with reference to only a C3977 DTC. The vehicle service manual should be consulted for more information on possible causes of the fault, along with required testing.