GMC Sonoma owners have reported 1 problem related to catalytic convertor (under the engine and engine cooling category). The most recently reported issues are listed below. Also please check out the statistics and reliability analysis of GMC Sonoma based on all problems reported for the Sonoma.
Check engine light came on. Dealer said air pump to catalytic converter failure. Approx $700. 00 to replace. Not covered by manufacturer.
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