1998 GMC Savanna P1336 Check engine Light

I just had a lot of work done on my 98 Savanna, but the check engine light has come back on. The code is P1336, for crankshaf position sensor value not correctly learned. The van runs fine, but I’m leery about taking it back to the mechanic after I’ve already spent a lot of money. What do you suggest?

Well, this same scenario actually happenned to me years ago. I suggest you go back to the mechanic for a simple computer relearn procedure, which he’d certainly do for free. On that GMC van, when computer parts are replaced, a relearning process has to be done to set the computer correctly. And for some weird reason, when this process is done by a mechanic, it has to be started with the foot off the brake pedal. But once the test is started, the mechanic must leave his foot on the brake pedal during the entire process. If he forgets and takes his foot off the pedal for even a second, you will be left with that P1336 code stored in the computer. Hey, everyone makes mistakes, especially with modern computer systems, so I’d just let him take care of it.