Your Gmc Jimmy engine control system detects a problem, the computer stores the diagnostic trouble
code U20EF in its memory.
To figure out what is wrong with your vehicle you must first extract the U20EF DTC For Gmc Jimmy.
To solve U20EF Gmc Jimmy problem, you'll have to remove the muffler, crankcase and other components blocking the valve chamber. Then, remove the cylinder head bolts (label for easy re-installation) Adjust the jaws of the valve spring compressor until they touch the top and bottom of the valve chamber Push the tool in to compress the spring and tighten the jaws Remove the retainers and lift out the valves , compressors and springs
U20EF Gmc Jimmy DTC Meaning
Network Code - Problem is climate control system, lighting, airbags, etc.
MFG - Manufacturer Specific
BBV Sensor Circuit Low Voltage
TFP Valve Position Switch-Drive Without Drive Ratio
If your vehicle failed a U20EF Gmc Jimmy test and the U20EF 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 U20EF 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 U20EF DTC For Gmc Jimmy: Any conditions that might cause ignition misfire, an overly rich or lean fuel condition, or loss of compression.