Chevrolet Avalanche U0121 Engine Trouble Code

Chevrolet Avalanche U0121 if your catalytic convertor fails completely, you eventually won't be able to keep the car running. Your gas mileage will also be terrible, so you should try and fix it as soon as you can. Unfortunately, the average replacement cost is around $2,000 and you can't do it yourself unless you're an experienced mechanic.

Chevrolet Avalanche U0121 Code Meaning :

When you check Chevrolet Avalanche 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.

U0121 OBD-II Diagnostic Network (U) Trouble Code Description

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 U0121 code.

Reason For U0121 Code

The reason of U0121 OBD-II Engine Trouble Code is Engine Oil Temperature Sensor Malfunction.

U0121 code on vehicles with electronically controlled automatic transmissions, the 3-4 shift solenoid is responsible for actuating the hydraulic circuits to activate clutches or bands that change gears inside the automatic transmission.

U0120 Previous Engine Trouble Code For Chevrolet Avalanche

Next Engine Trouble Code For Chevrolet Avalanche U0122