C1277 Diagnostic Trouble Code

C1277 is a kind of OBD-II Diagnostic C-Chassis Diagnostic Trouble Code.

It is considered generic because it applies to all makes and models of vehicles, although specific repair steps may be different depending on your car model.

Symptoms

Symptoms of a C1277 diagnostic trouble code may include:

Lack of power
Faulty O2 Sensor
Poor acceleration
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected

Possible Causes :

A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
Faulty IMRC actuator relay (if equipped)
Rough running engine due to misfiring plugs. Many engines have misfire codes to indicate the cylinder effected, such as P0307 for number 7.

Repair Processes :

Pack the connector cavity with dielectric silicone compound (same stuff they use for light bulb sockets and spark plug wires) and reassemble. Look for missing ground strap or a rusty ground where the fuel tank is grounded to the frame. Check for damage to the wiring harness connector. Oxygen sensors signal the engine management computer the amount of oxygen present in the exhaust, which is used in determining and controlling the fuel ratio.

Process Tips

Diagnostic trouble code C1277 is not difficult to diagnose and repair. Thus, it always pays to have a qualified technician to look after your vehicle should this error code arise.

Diagnosing this code requires the engine to be in good running shape, without unmetered air entering the engine. If other codes that relates to misfiring condition, lean running or air entering the engine is present, then you must first fix those error codes before C1277.

Fortunately, C1277 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C1277 Trouble Code For Specific Cars

C1277 Lotus Esprit Traction Control Module Request Circuit Failure
C1277 Bmw Concept Climate Control Temperature Differential Circuit Failure
C1277 Chrysler Stratus Exhaust Gas Recirculation Sensor B Circuit Low
C1277 Toyota Echo O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)
C1277 Lexus Lf TCM Power Relay Sense Circuit Low
C1277 Lotus 79 Torque Converter/Brake Switch B Circuit Low
C1277 De Tomaso Guara HPU (Hydraulic Pump Unit) Pressurisation Failure