Thread: P01260 - last test failed.

So the gt fuel pump is always in run high mode

Originally Posted by 97gtp01gt99gt

So the gt fuel pump is always in run high mode

Almost all cars were high-only. The FP speed control relay/resistor was a commonly deleted or bypassed system on 3800 SC cars to eliminate the possibility of failure.

Total guess, but with a SC tune and LTFT's wanting to reduce fuel, it could've been trying to enter low-speed mode and erroring due to the hardware not being there. Never looked into how detailed they programmed that system, so apply much salt to my guessing on that. Probably something in that realm of the pcm thinking it should be seeing that FP resistor and speed relay, though. Kill the DTC in the tune, and party on, if you don't have a car that came with that stuff.

So would this code cause my car to idle at around 1500 rpms