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  1. You should find bulletin #21-NA-149: Engine Wire Harness Chafing
  2. There's bulletin N212351210 for 2022 L5P: "In certain 2022 model year Chevrolet Silverado and GMC Sierra vehicles, equipped with a diesel engine, the Engine Control Module (ECM) may not properly detect faults, set DTCs or illuminate the Malfunction Indicator Light (Check Engine Light) if these fault conditions occur: Charge Air Cooler (CAC) low efficiency (DTC P026A) Exhaust Gas Recirculation (EGR) cooler low efficiency (DTC P2457) NOx sensor position 1 slow response (DTC P22F9)" Reprogramming ECM is fix for this. Not related to any cam sensor fault though.
  3. There is a new bulletin released for 2020 trucks with L5P. #21-NA-214. In case you have DTCs P2002, P2463, P2459, P144E, P0421, P0422, P0106 and/or P20EE, ECM and TCM may have to be updated with a new program.
  4. U062F means that ECM has lost communications with auxiliary coolant pump on LIN bus
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