P029d, p026d

2017 L5P Dmax with ~89K miles. Had a P029D code surface which set the CEL. Was able to clear; did not return after 2 add'l start cycles. However, the next day a P026D was found when interrogating the trouble codes with my Edge monitor. CEL not set with this code. Looks like a possible fault with my #1 injector? Balance rates (for what it's worth) show no appreciable difference between the 8 injectors.

Anyone else have this problem with their L5P? I'll be contacting the dealership after the weekend. Bad injector? Possible leakage? Hopefully, if repairs are req'd, it will be covered under the Powertrain/Drivetrain warranty. This makes 7 different trouble codes that I've had since buying this truck in 2017. :mad:

update- dealership says no trouble found. Continue to monitor it. At least the tank heater replacement parts have been ordered under GM's recall.