P0790 Diagnostic Trouble Code

P0790 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 P0790 diagnostic trouble code may include:

Fuel pressure too high
Diminished fuel efficiency
Rich or lean exhaust
Hesitation upon acceleration

Possible Causes :

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.
Dirty air cleaner element Damaged DPF
Faulty IMRC actuator relay (if equipped)

Repair Processes :

You might continue by connecting the scanner to the vehicle diagnostic connector and retrieving all stored codes and freeze frame data. 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. 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.

Process Tips

Diagnostic trouble code P0790 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 P0790.

Fortunately, P0790 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P0790 Trouble Code For Specific Cars

P0790 Bugatti Veyron Cylinder 2 Misfire Detected
P0790 Opel Diplomat Dim Panel Decrease Input Circuit Failure
P0790 Suzuki Alto Memory 1 Switch Circuit Failure
P0790 Mg X10 Alternator Load Input Failed High
P0790 Lincoln Aviator Throttle Position (TP) Sensor Circuit Intermittent Low Voltage
P0790 Armstrong Siddeley 17 Air Suspension LR Height Sensor Circuit Open
P0790 Pontiac Stinger Floor Temperature Switch Circuit Malfunction