P1345 Chevrolet Crankshaft Position-Camshaft Position Correlation
This is a code with a slightly different definition for every manufacturer. Regardless of the way the manufacturer describes the code, all vehicles will have one thing in common-the code relates to an ignition problem.
Each manufacturer is likely to have specific causes for the problem due to the difference in engine design and types of ignition triggers used. Some vehicles use coil on plug arrangements, while others use one coil for two plugs and so on.
To further complicate the issue, some vehicles have variable camshaft timing. This means that the camshaft advances or retards automatically at a certain RPM.
All vehicles use a crankshaft sensor (CKS) to signal the electronic control module (ECM) the position of the crankshaft relative to top dead center (TDC) on the compression stroke on the number 1 cylinder.
The camshaft sensor (CMS) signals the ECM the position of the camshaft lobes relative to the valves opening on each cylinder. This signal is used by the ECM to determine the best fuel injector timing.
Code P1345 is set when the correlation between the CKS and the CMS are not within 1 to 2-degrees, or out of sync.
When is the P1345 code detected?
The ECM detected that the cam and crank sensor positions were out of time
P1345 Chevrolet Possible Causes
- Engine mechanical condition-Valve timing off
- Cam sensor or crank sensor are loose on their mounting
- Faulty camshaft position sensor
- Faulty crankshaft position sensor
P1345 Chevrolet Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Engine hard to start
- Engine stall while driving
- Engine misfire above 1500 RPM
P1345 Chevrolet Tech
If this code came on after internal repairs on the engine, then you should check the engine to ensure you have the proper mechanical timing.
- Take the camshaft cover off.
- Set the number one cylinder at top dead center by making sure the alignment marks on the cylinder and the marks on the intake cam sprockets and exhaust are lined up.
If codes P1345 or P0016 are resetting, but are not linked to any engine performance issues and these causes are not related to the issue, you may need to replace the sprocket to the Cam Phaser Actuator.
P1345 Chevrolet Repair Procedures
The first thing you need to do is get a service manual. Go online and obtain all the technical service bulletins (TSBs) pertaining to this code.The technical service bulletins are representative of the complaints fielded by the service department and the type and nature of system failures.
Use a common OBD II code scanner and plug it into the OBD port. Turn the ignition switch on without starting the engine. Press the “Read” button and record all the codes.
Make a note of the TSB related causes for this code and the recommended repair procedure. Find the procedure in the service manual. It will provide you with a flow of diagnosis, the tools needed and the step-by-step repair procedure.
Over the years I have found that this code is generally a simple electrical connection or a failed camshaft sensor. It is possible, but highly unlikely that the CKS or CMS has come loose as suggested.
It is rare that a timing chain will jump a tooth unless the vehicle has very high mileage. The chain tensioner wears out creating a great deal of slack in the chain.
If a sensor has failed or a misfire is detected, an additional code will accompany code P1345 further identifying the source of the problem.
It is rare that a timing chain will jump a tooth unless the vehicle has very high mileage. The chain tensioner wears out creating a great deal of slack in the chain.
If a sensor has failed or a misfire is detected, an additional code will accompany code P1345 further identifying the source of the problem.
Read Also Ford P0455 Fault Code Problem Solution
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