1999 Gmc V2500 Suburban P0121 Fault Code Check

When you check 1999 Gmc V2500 Suburban car engine light came on code P0121 the reason should be Engine Light ON (or Service Engine Soon Warning Light). However Gmc manufacturer may have a different definition for the P0121 OBD-II Diagnostic Powertrain (P) Trouble Code. So you should chech it on our car models.

On 1999 and later P0121 1999 1999 Gmc V2500 Suburban engines, the instrument cluster has a built-in self-diagnostic mode that can be accessed by pressing and holding the instrument cluster SELECT/RESET button. Insert the ignition key and turn to the RUN position (but don't crank or start engine). Continue to press and hold the SELECT/RESET button (for 5 seconds) until the word TEST is displayed by the odometer. Release the SELECT/RESET button within three seconds after the word TEST is displayed to begin the self-diagnostic mode.

1999 Gmc V2500 Suburban P0121 OBD-II Diagnostic Powertrain (P) Trouble Code Description 1999 Gmc V2500 Suburban car P0121 OBD-II Trouble Code The throttle position sensor ( Reason For 1999 Gmc V2500 Suburban P0121 Code The reason of 1999 Gmc V2500 Suburban P0121 OBD-II Fault Code Check is P0121 Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance.

1999 Gmc V2500 Suburban P0121 Possibble Fix Ways :

A failing oil pump can cause what's called oil starvation, which is almost always fatal to any engine. Overhead cam engines are especially at risk, because the cam and valve train are farther from the pump than they are in pushrod engines. Oil should be of a proper viscosity, which means it needs to be light enough to move quickly.

If your vehicle failed a P0121 1999 1999 Gmc V2500 Suburban test and the P0121 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 P0121 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 P0121 1999 1999 Gmc V2500 Suburban: Any conditions that might cause ignition misfire, an overly rich or lean fuel condition, or loss of compression.

What does fault code P0121 mean for 1999 Gmc V2500 Suburban ? What does a diagnostic reading P0121 mean for 1999 Gmc V2500 Suburban ? How to fix OBD2 Code P0121 for 1999 Gmc V2500 Suburban ? What do we know about P0121 code for 1999 Gmc V2500 Suburban ?