C0861 Diagnostic Trouble Code

C0861 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 C0861 diagnostic trouble code may include:

Poor fuel economy
Possible spark knock (detonation / pre-ignition)
Misfire
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.

Possible Causes :

Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.
Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.
A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.

Repair Processes :

Find out what kind of system you have and verify that voltage to the fuel level sensor is present at the fuel pump wiring harness. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors. Pull the connectors apart and carefully look at the terminals (the metal parts) inside the connectors.

Process Tips

Diagnostic trouble code C0861 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 C0861.

Fortunately, C0861 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C0861 Trouble Code For Specific Cars

C0861 Vermorel Vermorel Purge Flow Sensor Circuit Low Input
C0861 Vignale 124 Purge Valve Stuck Open
C0861 Renault Ellypse Gear shift position Fault
C0861 Volvo V50
C0861 Guy V8 Passenger Side Airbag Fault
C0861 Alta 1100 Air Bag Passenger Pressure Switch Circuit Failure
C0861 Monteverdi 375 Battery Power Relay Circuit Failure