U1626 Diagnostic Trouble Code

U1626 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 U1626 diagnostic trouble code may include:

The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
Faulty PCM
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected
Engine surge

Possible Causes :

Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)
Rough running engine due to misfiring plugs. Many engines have misfire codes to indicate the cylinder effected, such as P0307 for number 7.
An air leak forward of the DPF will change the sensor readings resulting in the code

Repair Processes :

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. Now, clear the codes and test-drive the vehicle to see if the code is reset. Oxygen sensors signal the engine management computer the amount of oxygen present in the exhaust, which is used in determining and controlling the fuel ratio.

Process Tips

Diagnostic trouble code U1626 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 U1626.

Fortunately, U1626 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U1626 Trouble Code For Specific Cars

U1626 Db Rally HO2S Heater Control Circuit Low (Bank 2 Sensor 3)
U1626 Alpine V6 Air Bag Passenger Inflator Circuit
U1626 Tvr 420 Power Door Lock Circuit Short To Battery
U1626 Volvo 1500 SCP (J1850) Invalid or Missing Data for Climate Control (HVAC)
U1626 Proton Savvy Fuel Tank Pressure Sensor Circuit Open
U1626 Chrysler 300m Engine Oil Temperature Sensor High
U1626 Pagani Zonda Driver Mirror Horizontal / Vertical Feedback Potentiometer Circuit Open