Some 2019 Silverado 1500 and Sierra 1500 trucks may have an Engine Control Module (ECM) condition that requires reprogramming with the latest software calibrations now available. These conditions are covered in Bulletins #18-NA-289 and #18-NA-292.
Cylinder Deactivation DTCs
The Check Engine lamp may be illuminated on some 2019 Silverado 1500 and Sierra 1500 models equipped with the 5.3L V8 engine (RPO L82), the new 5.3L V8 engine (RPO L84) or the new 6.2L V8 engine (RPO L87) (Fig. 7) along with one or more of the following DTCs set in the ECM: P3498, P3499, P349A, P349B, P349C, P349D, P349E, and P349F (Cylinder Deactivation Performance). These conditions may be due to a fault with the Dynamic Fuel Management oil control solenoids. Reprogram the K20 ECM with the latest calibrations available in TIS2Web.
Refer to Bulletin #18-NA-289 for more information.
Fig. 7
Check Engine Lamp
On some 2019 Silverado 1500 and Sierra 1500 models equipped with the new 5.3L V8 engine (RPO L84) or new 6.2L V8 (RPO L87) engine, the Check Engine lamp also may be illuminated (Fig. 8), but without any accompanying drivability or performance concerns. If only the Check Engine MIL is on, it may be necessary to reprogram the K20 ECM with the latest calibrations available in TIS2Web. DTC P0300 (Engine Misfire Detected) also may be set in the ECM.
Refer to Bulletin #18-NA-292 for more information.
Fig. 8
These repairs only apply to the new 2019 Silverado 1500 and Sierra 1500 models identified in the service bulletins. Refer to the bulletins for VIN breakpoints. Do not perform the ECM programming if additional diagnosis indicates there are other drivability or performance conditions.
– Thanks to Tracy Lucas
