Guide To P0348 OBD Error Code Solutions

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Is your vehicle’s Check Engine Light illuminated? Are you experiencing sudden decrease in engine power and acceleration? Is there a drop in the fuel economy with increased level of emissions? All these indicate problem with the cam sensor and circuit and the Powertrain Control Module, thus flashing OBD Code P0348 error.

The Camshaft Position Sensor measures the exact rotational position of the camshaft. This provides a critical data signal used by the engine control module (PCM) to control the fuel injectors and ignition coils. When the PCM detects an irregular signal or no signal, it will set code P0348.

This code tells the PCM that the camshaft position is incorrect for the optimal performance of the vehicle. If the camshaft sensor detects a voltage reading that is more than 10% higher than the manufacturer’s specifications, the P0348 code will be stored.

What causes this problem with the Camshaft Position Sensor A Circuit High Input (Bank 2)?

• Electrical components, such as wiring, that have been damaged by leaking engine fluid
• Affected camshaft sensors
• Affected crankshaft sensors
• Open or shorted camshaft position sensor harness
• Problematic starter motor
• Weak battery
• Faulty starting system circuit

1. Camshaft Sensor - Any problem in the camshaft with directly hamper the engines performance. Buy quality camshaft replacement parts now.
2. Powertrain Control Module - PCM faults can store and display wrong OBD Code which can result in wrong diagnosis. Thus, replace the damaged components now.
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4. Starter Motor - Check for faulty starting system problems and replace the components if needed. Buy new starter motor now!
5. Car Battery & Cables - If the car battery has gone weak, replace it immediately. Buy new car batteries and cables now!
6. Ignition Spark Plug - Replace bad spark plugs immediately as it can be an easy solution to resolve OBD error code. Buy new spark plugs here!
7. Timing Belt And Pulleys - To maintain proper engine timing, replace the faulty parts now! Buy new timing belts and parts here!

The engine control module (PCM) uses pressure sensors to determine the pressure in the fuel system as well as the engine timing. If the pressure drops too low, the PCM will set code P0348. Some of the prime symptoms of this problem are mentioned below;

Common Symptoms

• Low engine power and limited output
• Abnormal throttle response and hard cold starting
• Declined fuel economy
• Sluggish Engine and lot of noise
• Engine smoking on start-up with increased emissions

Some of the parts that are directly affected and can be immediately replaced are as follows;

• Electrical components, such as wiring, that have been damaged by leaking engine fluid, as well as repairing the source of the leak
• Camshaft Position Sensors
• Crankshaft sensors
• Open or shorted camshaft position sensor harness
• Starter motor
• Weak car battery & cables
• Starting system circuit 

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Here are some steps which you should follow in order to diagnose this fault code:

After verifying the P0348 code with an OBD-II scanner, the mechanic should begin with a visual inspection of all electrical components, especially looking for leaking fluid that could have caused shorts or corrosion.

Any issues should be repaired, and the code should be cleared from the system. If the code reappears after a retest, the mechanic should then move on to performing voltage tests and resistance tests on the sensor, and comparing the information to the manufacturer’s specifications.

If the readings are within the correct limits, then the sensor needs to be replaced. However, if the

readings are not within the correct limits, then the issue lies elsewhere.

The mechanic should continue checking each possible cause, clearing the code and retesting the system after each attempt, to be sure that the correct solution is found.

Common mistakes when diagnosing the P0348 code

Most of the time we tend to diagnose the problem without completely identifying the real cause of it. It is important to follow all the diagnostic steps and examine each component carefully before correcting. Some of the components to be focused on are listed below;

• Damaged camshaft sensor
• Cam sensor circuit failure
• Starter motor failure
• Weak car battery
• Powertrain Control Module (PCM) failure
• Wiring/harness issue