C1656 Diagnostic Trouble Code

C1656 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 C1656 diagnostic trouble code may include:

Misfire
Misfire
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
Reduction in engine performance, especially at low RPM levels

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.
An air leak forward of the DPF will change the sensor readings resulting in the code

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. 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. If all testing has passed so far yet you still have the same code, check your scan tool and see if it can open and close the IMRC valve.

Process Tips

Diagnostic trouble code C1656 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 C1656.

Fortunately, C1656 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C1656 Trouble Code For Specific Cars

C1656 Talbot 25 Mirror Passenger Horizontal Feedback Potentiometer Circuit Failure
C1656 Bmw Z8 Column Tilt Feedback Potentiometer Circuit Short to Ground
C1656 Dacia Lodgy Fuel Temperature Sensor A Circuit Intermittent
C1656 Lotus Etna Traction Control Motor Circuit Failure
C1656 Bmw 1600 Cam Sensor Fault
C1656 Ferrari 458 Intake Manifold Runner Control (Bank 1) Stuck Open
C1656 Isuzu Bellel