Another issue affecting every model year of Pontiac Azteks is a check engine light caused by a faulty gas cap. Pontiac Aztek owners reported this issue to RepairPal on vehicles with between 54,000 and 185,000 miles, averaging about 100,000 miles. While there’s not a reliable fix for this issue, some owners reported success with simply retightening the stock gas cap. Others said the issue continues after replacing their Aztek’s factory gas cap with an aftermarket version.
The Aztek’s body control module, or BCM, is another source of frustration for 2004 Pontiac Aztek owners. According to Intellias, the BCM “coordinates activation of auto electronics units.” When the BCM fails it typically causes random issues with lights, power windows, radios, and essentially anything electrically powered. RepairPal estimates the diagnosis cost for this issue at around $100 depending on the shop you choose and your location and Rock Auto lists a Genuine GM BCM for sale priced at $183.79.
