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U1277 Engine Code Repair

Meaning of U1277 engine trouble code is a kind of network trouble code and when your car's 'U1277 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.

U1277 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 U1277 code is occuring now you should check U1277 repair processes.
Now don't ask yourself; What should you do with U1277 code ?
The solution is here :

U1277 Possible Solution:

U1277 Engine

Air Conditioning Pressure Sensor (ACP) Insufficient Pressure Change Each time the A/C clutch engages, the PCM is looking for a pressure change in the refrigerant. If the change in pressure is outside of the calibration the DTC will set. A/C system mechanical failure Open ACP or VREF circuit A/C sensor damaged A/C system electrical failure A/C clutch always engaged Verify A/C system function, including refrigerant charge.

U1277 Code Meaning :

U
OBD-II Diagnostic Network (U) Trouble Code For Engine

1
Fuel And Air Metering

2
Fuel Rail/System Pressure - Too High

7
Cylinder 4 Contribution/Balance Fault

7
Ignition Coil A Primary/Secondary Circuit Malfunction

The oxygen (02) sensors on your car measure the oxygen in the exhaust to determine how rich or lean the ratio of fuel and air are in the cylinders. Optimizing this mixture means better fuel economy and fewer exhaust emissions.

U1277 OBD-II Diagnostic Network (U) Trouble Code Description

U1277 engine trouble code is about Ignition Coil A Primary/Secondary Circuit Malfunction.

Main reason For U1277 Code

The reason of U1277 OBD-II Engine Trouble Code is Fuel Rail/System Pressure - Too High.

U1277 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.