Chooch Report post Posted March 3 CEL and wrench light came on. I’ve followed every thread that mentions P26CA and P26DO codes and everyone mentions wire issues with the water pump. I’ve checked everything and can not find any signs of corrosion or wiring issues. No blown fuses. I have noticed an excessive amount of time for engine to heat up and symptoms of a stuck open thermostat. Is it possible that the thermostat would cause these codes? Quote Share this post Link to post Share on other sites