GM Error Code P1336: How to Fix It

Q: What causes GM error code P1336?

P1336 is triggered when the ECM loses its learned crankshaft position sensor variation values, typically after battery disconnection, ECM replacement, crankshaft position sensor replacement, or sometimes after the battery goes completely dead.

Q: Can I drive with P1336 code?

Yes, you can typically drive with this code, but you may experience reduced performance, rough idle, or poor fuel economy. The code indicates the ECM needs to relearn sensor values rather than indicating a mechanical failure.

Q: Will P1336 clear itself over time?

No, P1336 requires a specific relearn procedure using an OBD2 scanner. The code will not clear on its own through normal driving, unlike some other diagnostic codes.

Q: What OBD2 scanner do I need for GM P1336?

You need an OBD2 scanner that supports GM special functions or bi-directional commands, specifically the 'Crankshaft Position Variation Learn' procedure. Basic code readers cannot perform this function.

Q: How often does the crankshaft position sensor need replacement?

Crankshaft position sensors typically last 100,000-150,000 miles under normal conditions. However, P1336 doesn't necessarily indicate sensor failure - it usually just means the relearn procedure needs to be performed.

Abstract

GM error code P1336 indicates that your vehicle's engine control module (ECM) needs to relearn the crankshaft position sensor variation. This code typically appears after battery disconnection, ECM replacement, or crankshaft position sensor replacement, and requires a specific relearn procedure to clear.