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Service bulletins for the 2015 Chevrolet Sonic

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

1331 on file from NHTSA, as of 2026-10-19.

About P0171 on the 2015 Chevrolet Sonic: what the code means, and the bulletins and recalls about the same components.

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Only bulletins with trouble code: P0171 are shown. Show all

Bulletins, newest first
N1922102302019-08-19. Service bulletin. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:CRANKCASE (PCV). N192210230 - Special Coverage - Some 2015-2016 Chevrolet Cruze and 2015 Chevrolet Sonic vehicles equipped with a 1.4L engine may have a condition where cracks can develop in the diaphragm of the Positive Crankcase Ventilation (PCV) pressure regulator valve. This valve is a part of the engine camshaft cover. If this were to occur, excess air could be drawn into the engine intake. As a result, the engine may run rough, especially during idle, the Malfunction Indicator Light (Check Engine Light) would illuminate and a diagnostic trouble code for Fuel Trim Lean (P0171) or other airflow related DTC would set. Dealers are to replace the engine camshaft cover as necessary. The repairs will be made at no charge to the customer.
19NA1142019-07-01. Service bulletin. ELECTRICAL SYSTEM. This informational bulletin provides information to the tech to test the PCV for proper performance before replacing the camshaft cover to correct a MIL On w/DTC P0171.
19NA1142019-07-01. Service bulletin. ELECTRICAL SYSTEM; ENGINE. This informational bulletin provides information to the tech to test the PCV for proper performance before replacing the camshaft cover to correct a MIL On w/DTC P0171.

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.