C284D Diagnostic Trouble Code

C284D 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 C284D diagnostic trouble code may include:

Engine surge
Blown fuse (if applicable)
Lack of power
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)
Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)

Repair Processes :

If the scan tool has that capability, and the scan tool can operate the IMRC valves, then the problem is either resolved and a simple code clearing is all that's left or a new PCM would be called for. 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.

Process Tips

Diagnostic trouble code C284D 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 C284D.

Fortunately, C284D is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C284D Trouble Code For Specific Cars

C284D Keller Super Chief Seat Passenger Memory Position Error
C284D Daihatsu Muse Glow Plug Circuit High Input (Bank #1)
C284D Cisitalia 1250 Exhaust Valve Control Solenoid Circuit (Bank 2)
C284D Skoda Octavia I Knock Sensor 1 Circuit Range/Performance (Bank 1 or Single Sensor)
C284D Lincoln Mark Throttle Position Sensor In Range But Higher Than Expected
C284D Mazda 2 Transmission Transfer Case Contact Plate 'B' Open Circuit
C284D Buick Invicta Cylinder 8 Contribution/Balance Fault