P1336Ignition System

Crankshaft Position System Variation Not Learned (GM)

P1336 is a GM code meaning the crankshaft position system variation (CKP variation) has not been learned. The PCM needs a CASE relearn procedure to accurately detect misfires.

🚗 Yes, but misfire detection may not work correctly until the variation is relearned.

MEDIUM

severity

🎯 Top Causes, Ranked by Likelihood

#1CKP variation relearn not performed$0-$120

45%

After a PCM, crank sensor, or engine repair, a CASE relearn is required.

#2Failing crankshaft position sensor$60-$300

30%

A bad sensor produces an erratic signal the PCM cannot learn.

#3Reluctor wheel or wiring issue$100-$600

25%

Damage to the reluctor or wiring corrupts the crank signal.

🩺 Common Symptoms

Check engine light
Possible false or missing misfire codes
Usually no drivability change
Fails to complete misfire monitor

💰 Repair Cost: DIY vs Shop

DIY Cost

$0-$300

Shop Cost

$100-$400

📋 Free OBD2 Code Cheat Sheet

The 50 most common codes with likely cause and DIY fix cost. Sent once, no spam.

🔧 How to Diagnose P1336

1Perform the CKP variation (CASE) relearn with a capable scan tool

2Inspect the crankshaft position sensor and connector

3Check the reluctor wheel for damage

4Recheck for related misfire codes

❓ Frequently Asked Questions

Can I drive with P1336?

Yes, usually, but the misfire monitor may not work right until the relearn is done.

Is P1336 a GM code?

Yes, P1336 is a GM crankshaft position variation not learned code.

How do I fix P1336?

Perform the CKP variation relearn (CASE relearn) with a compatible scan tool after any related repairs.

🔗 Related Codes

P0315P0335P0336