C1881 Diagnostic Trouble Code

C1881 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 C1881 diagnostic trouble code may include:

Fuel pressure too low
Rich or lean exhaust
Diminished fuel efficiency
The engine oil will exhibit dilution from the ECUs attempts to increase engine temperature. Some vehicles advance the fuel injection timing slightly after top center to afterburn a small amount of fuel to increase exhaust temperatures. Some of this fuel enters the crankcase. When the ECU determines the necessity to regenerate the DPF, the service life of the oil be shortened significantly

Possible Causes :

Defective ECU strategies or components will prevent proper regeneration
The Mass Airflow sensor is a hot wire that senses the volume of air entering the intake manifold. The computer uses this information to control fuel mixture.
Faulty IMRC actuator/sensor

Repair Processes :

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. 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.

Process Tips

Diagnostic trouble code C1881 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 C1881.

Fortunately, C1881 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C1881 Trouble Code For Specific Cars

C1881 Peugeot Vroomster Engine Oil Temperature Sensor High
C1881 Graf Und Stift Sp Passenger Door Unlock Switch Circuit Shorted to Ground
C1881 Subaru Legacy 3 Left Rear Stop lamp Circuit Short to Battery
C1881 Volvo 120
C1881 Stephens Salient Six Lamp Park Input Circuit Short To Ground
C1881 Rambler 770 Fuel Temperature Sensor B Circuit Intermittent
C1881 De Dion Bouton Doctors HO2S Insufficient Switching Sensor 1