U251D Volvo Xc90 DTC Code

Volvo Xc90 Engine Specifications:

Engine Type :	Single Cylinder Engine
Cylinder Type :	Opposite Piston Engine
Engine Air Intake Process :	Supercharged Engine

Your Volvo Xc90 engine control system detects a problem, the computer stores the diagnostic trouble code U251D in its memory. To figure out what is wrong with your vehicle you must first extract the U251D DTC For Volvo Xc90.

A good ground connection is also extremely important. U251D Volvo Xc90 engine problem because the presence of voltage at the panel harness won't make the panel work if there is a bad ground connection. Since the instrument cluster is mounted in a plastic dash, a separate ground wire or ground circuit through the wiring harness is usually needed to complete the power circuit. Refer again to the wiring diagram to find the ground path, and then check it with your ohmmeter. Do not use a self-powered test light because it cannot measure resistance (any resistance will lower circuit voltage).

U251D Volvo Xc90 DTC Meaning

U	Network Code - Problem is climate control system, lighting, airbags, etc.
2	MFG - Manufacturer Specific
5	Auxiliary Emission Controls
1	IC Circuit High Voltage
D	TFP Valve Position Switch-Drive Without Drive Ratio

If your vehicle failed a U251D Volvo Xc90 test and the U251D Check Engine Light is NOT on, chances are you have a problem with the OBDII system, a burned out MIL lamp, or a faulty catalytic converter. The converter is essentially an afterburner that cleans up the exhaust after it exits the engine. The OBDII system uses U251D a ownstream oxygen sensor to monitor the efficiency of the converter, and it should detect a drop in converter efficiency if the converter has been contaminated or is failing (ignition misfiring, leaky exhaust valves, and oil burning can all damage the converter). What you want to look U251D DTC For Volvo Xc90: Any conditions that might cause ignition misfire, an overly rich or lean fuel condition, or loss of compression.