Chevrolet C2500 Suburban U0121 Engine Error Code

When you check Chevrolet C2500 Suburban car engine light came on code U0121 the reason should be Engine Light ON (or Service Engine Soon Warning Light). However Chevrolet manufacturer may have a different definition for the U0121 OBD-II Diagnostic Network (U) Trouble Code. So you should chech it on our car models.

On 1999 and later U0121 Chevrolet C2500 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.

Chevrolet C2500 Suburban U0121 OBD-II Diagnostic Network (U) Trouble Code Description Chevrolet C2500 Suburban car U0121 OBD-II Trouble Code Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and comm Reason For Chevrolet C2500 Suburban U0121 Code The reason of Chevrolet C2500 Suburban U0121 OBD-II Engine Error Code is U0121 Lost Communication With Electronic Brake Control Module.

The U0121 Chevrolet C2500 Suburban Check Engine lamp is perhaps the most troubling of lights because it could mean so many different things, from you didn't screw the gas cap on tightly enough to look out for pistons flying through the hood and into the stratosphere. The easiest way to find out what this light is telling you is to hook your vehicle up to a scan tool. diagnostic tool looks a little like an oversized calculator and plugs into a communication port inside the car. After you instruct it to perform the scan, it speaks U0121 Chevrolet C2500 Suburban with your car's computers to find out exactly what's prompting the light to turn on.

Chevrolet C2500 Suburban U0121 Possible Solution :

Power Steering Pressure (PSP) Switch Signal Malfunction The PCM counts the number of times vehicle speed transitions from 0 to a calibratable speed. After a calibratable number of speed transitions the PCM expects that the PSP input should have changed. This DTC is set if the transition is not detected. Vehicle towed with engine running Power steering hydraulic concern was repaired but DTC was not erased PSP switch/shorting bar damaged SIG RTN circuit open PSP circuit open or shorted to SIGRTN PCM damaged Check, if possible, if vehicle was towed or power steering service was performed. Observe PSP V PID while checking wires for intermittents.

What does fault code U0121 mean for Chevrolet C2500 Suburban ? What does a diagnostic reading U0121 mean for Chevrolet C2500 Suburban ? How to fix OBD2 Code U0121 for Chevrolet C2500 Suburban ? What do we know about U0121 code for Chevrolet C2500 Suburban ?