C1640 Diagnostic Trouble Code

C1640 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 C1640 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. If the engine displays a miss and there wasn't a code, determine which cylinder is misfiring. If the exhaust manifold is visible, spay or pour a small amount of water on each cylinder exhaust port. Water will evaporate immediately on good cylinders and slowly on the missing cylinder. If this can't be accomplished pull the plugs and check the condition. Use the DVOM to test resistance and continuity on all system circuits if actuator and sensor resistance levels are in compliance with manufacturer's specifications.

Process Tips

Diagnostic trouble code C1640 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 C1640.

Fortunately, C1640 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C1640 Trouble Code For Specific Cars

C1640 Cadillac 50 Damper LR Circuit Short to Ground
C1640 Gmc Jimmy Park Brake Actuator Assembly Switch Released Circuit Short to Gnd
C1640 Dodge Srt-4 Ignition Start Circuit Open
C1640 Brewster Brewster Coolant Temp Out of Range
C1640 Bristol 406 COURTESY LAMP OUTPUT Failure
C1640 Volkswagen Gx3 Ride Control RR Shock Actuator Circuit Short To Ground
C1640 Maserati 4200 Transmission Fluid Deteriorated