2002 trailblazer 4.2 4wd i have a code p1345 that keeps returning ive replaced the cam postion sensor and the crank sensor and the cam postion actuator solenoid i just put the cam position actuator solenoid in about 1000 miles ago and the code came back so it lasted for a 1000 miles ray

This a very common problem.
A loose CMP sensor causing a variance in the sensor signal
Excessive free play in the timing chain and gear assembly
Incorrectly installed distributor - 1 tooth off in either advance or retard positions
A loose distributor rotor on the distributor shaft
A faulty crank position sensor

CK for vacuum leaks. VARIABLE VALE TIMING cause that code too.

The following conditions may cause this DTC to set:
If this DTC sets, there is a problem with the camshaft position actuator solenoid high control circuit shorted to voltage or the solenoid stuck open.

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An improperly torqued harmonic balancer

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A misbuilt or mis-timed engine

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A loose or missing crank damper bolt

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The camphaser solenoid stuck open

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The camphaser stuck in a position other than 0 degrees

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The camphaser does not return to 0 degrees within 16 seconds

First try cleaning the throttle body,make sure you take it off the intake manifold so that the rear side gets cleaned as well. While doing the cleaning, disconnect the battery so that the PCM will reset and relearn to the freshly cleaned throttle body.

Give me some more information about this problem. May be i can help.

P1345 - Crankshaft Position (CKP)-Camshaft Position (CMP) Correlation.

This code is a very strong indication of communication failure between the cam and crank shaft sensors. In order to diagnosis correctly, you will need ot purchase a genuine GM code reader. This code reader will allow you to run specific test that will isolate which sensors is damaged or if there are simple issues that exist in the wiring at each sensor. The special code reader will cost around 189 dollars. You can purchase it at your local auto zone or either high end auto parts store. If you cannot afford to purchase such tool; Take this vehicle to the nearest competent GM certified local mechanic or a near by GM dealership for the proper repair detail.

One or both of the sensors mentioned may be out of order or misaligned, thus, not allowing for an efficient pulse ping. There may be loose or deteriorating wiring at the connectors of each sensor or PCM ports, as well. You will need ot preform the test needed with the GM code reader to isolate the issue, properly.

dammed electronics ,bane of my life so your not the only one and in cases like this i can only suggest you bite the bullet and take vehicle to a main dealer .sorry i know this isnt the answer your looking for but from experiance certain things on modern motors you cannot do your self

I had the p1345 on my 2002 Silverado this week. The code means Crankshaft/camshaft position correlation. In other words the cam is not where it is supposed to be in reference to the crank. It could be the Cam position sensor, the crank position sensor , the gear on the distributor or the timing chain. The quickest and cheapest check is the distributor gear which is what mine was. It's quite common. The gear is about $60 and can be replaced in less than an hour with the right experience. The engine won't usually run if it's the crank sensor and the cam sensor is a little more.

Code p1345 is the crankshaft variation learn.You need to get the crankshaft variation learn done for the code to clear.You will need a scan tool.This should take care of the check engine light.Hope this helps.Good luck.