Error Code P1345: Causes, Symptoms, and How to Fix It

Every time the check engine light turns on, we know you get anxious. Not all codes that your OBD scanner displays are serious, but it’s better to check them as soon as possible. Does your OBD scanner display the error code P1345? If yes, then this is something you should not take lightly, as it affects your vehicle’s drivability. Here’s everything you need to know, from what’s error code P1345 to how to fix it.    

What’s trouble code P1345?   

Trouble code P1345 displayed on an OBD 2 scanner is defined as Crankshaft Position-Camshaft Position Correlation.  

The trouble code is a manufacturer-specific trouble code. This means the code does not apply to all vehicle makes. Instead, it is applicable only for specific vehicle makes, such as Audi, GM (Chevrolet/GMC), Isuzu, Lexus, Mazda, Toyota, and Volkswagen.

The exact definition, troubleshooting methods, and repairing techniques can vary from one model to another. However, one common thing the code points toward, irrespective of your vehicle’s model and make, is that it’s an ignition problem.  

What triggers P1345?   

As we mentioned earlier, the definition for the code can be slightly different for different manufacturers. This is due to the difference in the engine’s make, design, and ignition triggers. However, owners of Chevy most commonly face this trouble code, and here’s why it happens.  

The crankshaft position sensor and the camshaft position sensor work together with the ECM to control your vehicle’s engine timing. When these sensor malfunctions, the ECM is fed with false position signals. Since the crankshaft and camshaft work in tandem, a false signal will make them fall out of sync. This causes bad timing and makes the engine run poorly.  

A failed, or malfunctioning CPS or CMP can cause a P1345 code. This is simpler to diagnose because the OBD scanner will display the code for the failed sensor. In older Chevy models, P1345 is triggered because of problems in the distributor.  

What are the P1345 code symptoms?   

Here are the most common symptoms your Chevy will exhibit for the P1345 trouble code:  

• The vehicle engine runs poorly   
• Rough idle or stalls out at idle  
• Engine hard starts   
• Cylinder misfires  
• Ticking noise from the engine  
• Engine misfire after 1500 RPM 

What causes P1345?   

Here are the possible causes that could trigger the trouble code:   

• Faulty camshaft position sensor (CMP)   
• Faulty crankshaft position sensor (CPS)  
• Stretched timing chain  
• Incorrect distributor positioning or bad distributor  
• Bad wire hardness connection  

How to check and fix the P1345 trouble code?   

P1345 diagnosis can change depending on the vehicle you drive. Therefore, it’s best to check the technical service bulletins for the code online.  

 The first step is plugging in the OBD scanner to the port and pressing the ‘read’ button without starting the engine. The repair procedures will be based on the codes. Here are a few things your mechanic will look for:  

• Loose CMP sensor that’s causing the signal variance  
• Missing or loose distributor hold-down bolt  
• Loose distributor rotor on the distributor shaft  
• Wrongly installed distributor-1 tooth OFF in either advanced or retard positions  
• Excessive free play in the timing chain and gear assembly  

Here’s how you can fix the issue:   

• Replace crankshaft position sensor  
• Replace camshaft sensor  
• Repair the PCM   
• Repair open or short in ignition coil power supply  
• Check if the distributor is installed properly and fix it   

By following the above steps, you can easily fix the code in most cases.   

How to adjust the distributor positioning?   

• First, loosen the distributor hold-down bolt with the engine switched OFF.  
• Plug the OBD scanner and monitor the Cam Retard Offset reading  
• Next, turn the engine on, let it warm and then increase the RPMs to above 1,000  
• Turn the distributor counterclockwise if the reading is negative. And if the reading is positive, turn the distributor clockwise.   
• Turn the distributor till the reading is between –2 to 2 degrees.   

How serious is error code P1345?  

The P1345 code is not something you should ignore since it can create drivability issues. It can reduce fuel efficiency, increase vehicle emissions or create engine staring issues. If you don’t fix the issue at the earliest, it will affect your vehicle’s performance or cause permanent damage to your car.   

How much does it cost to replace a camshaft position sensor?  

The camshaft position sensor replacement cost is anywhere between $170 to $230. In addition, the labor costs could be between $80 and $100, while the parts can cost you up to $140. However, the price range can change based on your vehicle model. 

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