P1959 Diagnostic Trouble Code

P1959 is a kind of OBD-II Diagnostic P-Powertrain 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 P1959 diagnostic trouble code may include:

Fuel pressure too high
Diminished fuel efficiency
Rich or lean exhaust
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.
Faulty IMRC actuator relay (if equipped)

Repair Processes :

Look for damage to the tank indicating impact that may have damaged the fuel pump or sender. 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 P1959 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 P1959.

Fortunately, P1959 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P1959 Trouble Code For Specific Cars

P1959 Ginetta G40 Output Speed Sensor Circuit Malfunction
P1959 Chrysler Es Evap Emission Control Sys Leak Detected (Gross Leak/No Flow)
P1959 Volvo 960 SCP (J1850) Invalid or Missing Data for Engine Oil
P1959 Hyundai Coupe SCP (J1850) Invalid Data from GEM
P1959 Chenard Walcker 2-litre Door Unlock Disarm Output Circuit Short To Battery
P1959 Porsche Karisma Fuel Pump Secondary Circuit Intermittent
P1959 Mercedes Sl 55 Air Bag Crash Sensor #2 Feed/Return Circuit Short To Ground