Question about 1998 GMC Sierra

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Code 1345 changed distributor, timing gears and crankshaft sensor and plug< and the code is still there. distributor is correct

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  • yadayada
    yadayada May 11, 2010

    ISN'T ABOUT TIME U HAVE THE DEALER FIX THIS? U MAY ALSO TRY OUR LIVE CHAT OPTION, WHAT'S ANOTHER $20?

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

Try adjusting the sensor. if this doesn't work, replace it asap.

Posted on Jun 24, 2009

  • Michael Masters
    Michael Masters Jun 24, 2009

    In most cases, the sensor may be over torqued.

    You cant over torque it because, it will cause false readings.


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2000 trail blazier with random misfire,sulfur smell, glowing convertor. New cap,rotor button plugs,plug wires and convertor NO CHANGE ! ANY IDEAS ?


Is the check engine light lit ? Any DTC'S - diagnostic trouble codes ? What engine ? 4.3 L vortex . Leaking fuel pressure regulator under the upper intake manifold . Leaking fuel injectors ! Ignition timing problem . How does the engine run ? Who installed the plugs an wires ? are they right ? Fuel pressure leak down test, fuel injector balance testing . Check distributor drive gear an slop in the shaft . Did you have distributor out ? Is it in the proper position ? What cylinder is misfiring ? engine mechanical problem ! What do spark plugs look like ? fouled , soaked with fuel . Do a engine compression test .
The camshaft drives the distributor shaft which rotates providing a spark to the correct cylinder by way of the cap and rotor. The camshaft position sensor functions much like the crankshaft sensor previously described but provides only a 1x signal to the VCM. That is, for every 2 rotations of the crankshaft, there is 1 rotation of the camshaft. Note that the CMP sensor will not affect driveability. The sole purpose of the CMP sensor is to provide the VCM with the necessary information for the misfire DTCs.

Nov 10, 2015 | Cars & Trucks

1 Answer

#2 cylinder misfire


This is also causing your miss also
GMC Forum: P1345 Camshaft to Crankshaft correlation faulty
Originally Posted by piecesholden@hotmail.com
I hooked my 1997 sierra up to a OBD Scanner and it reads that i have a P1345 code which is a camshaft to crankshaft correlation fault. Could it be a bad sensor or is it automatically my timing change that needs to be replaced? You are correct, the ECM has detected the timing from the crankshaft and camshaft is off to far to set off the DTC code P1345. It's more common for distributor gear to be worn then your timming chain. If your timming chain is stretched, you can hear it rattleing under hard acceleration.

The 1996 and newer Vortec is a non adjustable timing. There is a very good chance that replacing cam position or crankshaft position sensor will not fix this problem. This code tells you that the base timing of the vehicle is not correct. You really need to get the vehicle scanned with a scantool that will read the cam retard with the engine running over 1200 rpms and then make adjustments by turning the distributor, unless it is timing chain/gear stretch/wear or wear on the distributor gear. You could mark the current distributor orientation and turn the distributor counterclockwise, clear the code and start the vehicle and rev over 1200 rpm to see if it comes back, but the scan tool that can read the cam retard is the best way.

FYI The cam position sensor is in the distributor and the crankshaft position sensor is mounted to the bottom of the motor near the balancer. But i would look in to repalceing the worm gear at the bottom of the distributor shaft, the 97 and 98s, Vortec engine is that the gears were soft and they would actualy wear enough to through off the timing and you could try to adjust the timing but at some point you'll run out of adjustment. Also, the real big problem is that the gear is also hooked to the oil pump and at 75 or so, it may strat to mis-fire and backfire because the timing is so far off and the oil pump is also run off the same gear and your oil pump can fail.

This is a common problem with that vintage of GM distributors because you could usually adjust the timing enough to get the code to go away but you are just masking the real problem. Friend is a GM certified Tech, worked at an Olds dealer for 10 years before opening his own place, but he had never herd of this as being common. He then proceeded to show me a box with about 25 to 30 gears all worn the same way and all from 96 thruogh 99s that had SES lights on. And now with a $40 part and less than two hours labor and ten minutes on a scanner all these 100K mile trucks run fine and can pass E-Test.

Good luck and you really need a Tech2 scanner to get a better picture on why your getting a P1345 DTC code, but most likely it's going to be a $40.00 distributor gear.

Dec 07, 2017 | 1997 GMC Suburban

1 Answer

1999 Chev K2500 Suburban (Old Body) 5.7 / auto started running rough at accelleration, under slight load (hills, trailer, starts). No codes or MIL light. Replaced plugs & wires (only owned truck for...


If you can determine the ignition system is ok, I would look at fuel pressure and the fuel filter. If the distributor was loose you may have to check base timing.

Dec 05, 2012 | Cars & Trucks

1 Answer

GM OBD2 code 1345 causes


either the crankshaft sensor needs to be changed or camshaft sensor.Both work together and are under that code.If you change the sensors you will need a crankshaft profile correction.This should be done by your dealer with the proper scan tool.

May 01, 2012 | 1999 Chevrolet K1500

1 Answer

19981500 silverado code p1345,i am being told this means i need a new timing chain is this correct


if the distributor is tight no slop in shaft movement up and down ok side to side tight then you need to check dist calabration its actually a cam sensor in the distributor if you hook up a scan tool to it and look at the cam position it will show how far its out it should be -2 or 0 at 1000 rpms you can adjust some by turning the base of the distributor if the timmig chain gets to sloppy you wont get to the correct specs. hope this helps

Feb 29, 2012 | 1998 Chevrolet K1500

2 Answers

I have a 98 chevy z71 5.7 350 vortec, i have a p1345 code that stays on i clear it and as i restart the truck it comes back on, the truck runs great and has a small delay when starrted.. what can/do i need...


1345 is cam and crank sensor correlation its mainly the cam sensor going out, also the delay start that also trigger a camsensor code they call it excessive crank time check the fuel pressure that is capable of setting a cam code (1345) If fuel pressure is good (55-60 psi) expect to replace the camsensor you might as well do the crank sensor heres a nightmare on this code it can set if the distributor is off one tooth and yes these distributor have high failure rate

Jun 08, 2011 | 1998 Chevrolet K1500

1 Answer

How to fix p1345 obd code on 97 chevy 1500 5.7 Lt.


P1345 is "Crankshaft position sensor / Camshaft position sensor correlation"

Code P1345 determines if the distributor is installed incorrectly, or if a mechanical malfunction is present in the engine. The light will trigger when the engine is running and the camshaft sensor reference pulse is not detected at a correct relative position with the crankshaft pulse. Most likely causes for this Chevy check engine light code include a faulty crankshaft position sensor, a wiring concern or an improperly installed distributor. A quick check on the crankshaft sensor is to monitor the RPM value with a scan tool while revving up the engine. If the reading is close to twice the expected RPM, then the sensor is likely faulty. There are other less likely concerns possible, such as base engine or computer related issues, but these involve more in depth testing. I hope this information is useful.

May 27, 2011 | 1997 Chevrolet K1500

1 Answer

Code 1345 pops up why


This code is an indication that the synchronization between the Crankshaft and Camshaft is off.
Can be caused by a bad crank position sensor or bad cam position sensor or worn (stretched) timing set. The MOST COMMON cause of this in chevy engines is a worn distributor drive gear.

Mar 27, 2011 | Chevrolet C3500 Cars & Trucks

5 Answers

Trouble code 1345 crank sensor/camshaft sensor correlation


I had this same P1345 code on my 1998 GMC K1500 5.7 for about 2 years. Each time the code was erased, the "Service Engine Light" came right back on with the same code. I tried replacing the cam sensor, but that didn't solve it. I had the timing adjusted, it was out -13 degrees. After adjustment, the "Service Engine Light" went off, but only for a short time. Adjusting the timing is just a temporary mask on fixing the real problem and eventually you will run out of adjustment. I read about this same problem on another forum and someone recommended changing the distributor gear. So I checked the gear and a the teeth were worn. Replaced the gear ($35 part), readjusted the timing and the light has been off ever since. Apparently the gears in 96-99 are soft and wear enough to throw off the timing. This code is telling you the crank and distributor are out of sync. So before you start buying sensors and other misc. parts, try the distributor gear if you are getting a P1345 code.

Mar 03, 2009 | 1998 GMC Sierra

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