Brand New Sierra Codes P25a2 U0101 100 146 19 21 Silverado Sierra Troubleshooting Gm Trucks Com
GM Motor Company Group Diagnostic Trouble Codes Here is the list of DTC's This is a HUGE file (48 pages ) so it's probably easiest to use your scroll function to locate the code you're looking for Combustion engines run most efficiently when they maintain an airfuel mixture ratio of 147 parts air to 1 part fuel When there are more than 147 parts air to 1 part fuel in the airfuel mixture, a lean condition exists and code P0171 is triggered