Question about 1999 GMC Jimmy
According to the GM factory service manual, the OBD-II trouble code, P1336, is defined as follows: DTC P1336 CKP System Variation Not Learned. The factory service manual does not enumerate all of the symptoms of this trouble code, but after consulting a professional custom PCM tuner, it was learned that aside from the annoying light on the instrument cluster, the other symptoms exhibited may include: poor vehicle performance, and loss of misfire detection diagnostics.
This DTC is particularly nasty, because simply clearing it by disconnecting the battery, or clearing it using an OBD-II scan tool will not address the problem. The code will be set again later unless the vehicle is run through the actual “crank relearn” procedure.
There is only one way to properly fix the P1336 DTC, and that’s to perform a “crank relearn” procedure, or as the GM factory service manual procedure calls it, the CKP System Variation Learn Procedure. This procedure can be initiated and performed by GM’s be-all end-all scan tool, the Tech-2. It can also be performed by some aftermarket scan tools. Furthermore, some of the PCM tuning software applications are capable of initiating a “crank relearn” procedure.
For most enthusiasts that encounter this issue, the best course of action is to bring the vehicle to a local GM dealership and have them perform the procedure. Unfortunately most dealerships will charge a modest fee for doing this (upwards of USD $100 in some cases).
Posted on Oct 07, 2009
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Posted on Jan 02, 2017
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