What Are Some Common GM Trouble Codes and What Do They Mean?

What Are Some Common GM Trouble Codes and What Do They Mean?

Some common General Motors trouble codes include P1500, which indicates a problem with the starter signal circuit; P1514, in which the airflow to the throttle position sensor is too high; P1531, which indicates that the air conditioner's refrigerant is low; P1584, which shows that cruise control is disabled; and P1599, which detects an engine stall. Trouble codes from P1680 to P1687 show that there is a powertrain control module fault.

Trouble codes help vehicle owners or mechanics diagnose problems with a vehicle. When there is a problem that triggers a particular code, the Check Engine light appears on the vehicle's dashboard. In order to read the code, the owner or mechanic needs a code reader, which connects to a vehicle's instrument panel.

Codes do not provide exact information regarding the problem. Instead, they indicate a particular area where the problem exists. The owner or mechanic must carry out further diagnostic tests to determine the necessary repairs.

GM introduced an early version of its on-board diagnostic system in 1980. Early versions provided little diagnostic information, but over time the systems offered by GM and other automobile manufacturers improved. These systems now offer real-time data to aid in identifying problems. As of 1996, all vehicles sold in the United States must have an on-board diagnostic system.