Hyundai Elantra 2021 — technical service bulletin
Bulletin 21-01-043H · NHTSA communication 10196551 · issued May 27, 2021
Technical service bulletin
communication type
Engine and Engine Cooling
component
2021
model years
1
vehicle entries
Official summary
This bulletin provides information related to the Engine Control Module (ECM) software update for 2021MY Elantra (CN7/CN7A) vehicles equipped with the 2.0L engine to update the ECM logic for the following conditions and DTCs: ï · Incorrect learning of the fuel adaptive values can occur if the engine is started at 14â °F (-10â °C) or colder ambient temperatures. If incorrect values are learned, the engine may stall when coming to a stop or at idle. DTC P016C: Closed Loop Air/Fuel Ratio Control at Limit-System Too Lean may be detected. The ECM software revises the logic for fuel adaptat
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.