U1948 Diagnostic Trouble Code

U1948 is a kind of OBD-II Diagnostic U-Network 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 U1948 diagnostic trouble code may include:

Excessive exhaust leak
Hesitation upon acceleration
Malfunction Indicator Lamp (MIL) illuminated
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.

Possible Causes :

An air leak forward of the DPF will change the sensor readings resulting in the code
Rusty exhaust systems, cracked exhaust manifolds or damaged or missing gaskets or donuts will cause air leaks.
Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.

Repair Processes :

Check to make sure they are not burnt or corroded. If in doubt, get some Electrical Contact cleaner at any parts store if cleaning of the terminals is needed. With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground. Look at the plug wires to make sure they are not burnt or laying on the exhaust.

Process Tips

Diagnostic trouble code U1948 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 U1948.

Fortunately, U1948 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U1948 Trouble Code For Specific Cars

U1948 Zaz 968
U1948 Nag Voran Camshaft Position Sensor Circuit Low Input
U1948 Chevrolet Chevelle Driver Power Window Up Circuit Short To Battery
U1948 Moretti Moretti Blower Switch Failure
U1948 Chrysler Centura Engine Position System Performance (Bank1)
U1948 Otosan Anadol Door Unlock Disarm Switch Circuit Short To Battery
U1948 Mazda Bt50 Transmission Transfer Case Differential Lock-Up Feedback Switch Short Circuit To Ground