C2639 Diagnostic Trouble Code

C2639 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 C2639 diagnostic trouble code may include:

Fuel pressure too high
Diminished fuel efficiency
Rich or lean exhaust
Reduction in engine performance, especially at low RPM levels

Possible Causes :

Dirty air cleaner element Damaged DPF
A plugged converter will cause of host of driveability problems as well as set this code. A severely plugged converter will result in the inability to increase rpm when under load. Look for a code such as P0421 -- catalytic converter efficiency below threshold if the converter indicating a faulty converter.
Faulty IMRC actuator relay (if equipped)

Repair Processes :

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. Once located, visually inspect the connectors and wiring. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors. Look for damage to the tank indicating impact that may have damaged the fuel pump or sender.

Process Tips

Diagnostic trouble code C2639 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 C2639.

Fortunately, C2639 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C2639 Trouble Code For Specific Cars

C2639 Mazda 323 Transmission Transfer Case Contact Plate 'C' Circuit Failure
C2639 Ecosse Signature Inductive Signature Chip Communication Error
C2639 Peugeot 207 EEPROM Malfunction
C2639 Toyota Publica Park Brake Switch # 1 Released Circuit Short to Gnd
C2639 Nissan Laurel Column Reach Feedback Potentiometer Circuit Open
C2639 Alta 1100 Air Bag Passenger Pressure Switch Circuit Failure
C2639 Infiniti Q45 SCP (J1850) Invalid or Missing Data for External Lamps