P0348 code definition
The P0348 code is stored in the PCM when the voltage reading from the camshaft position sensor circuit for camshaft sensor A in engine bank 2 is too high. This code may be stored with crankshaft sensor codes.
What the P0348 code means
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 the P0348 code?
There are quite a few causes that could lead the PCM to store the P0348 code. Those include:
- Electrical components, such as wiring, that have been damaged by leaking engine fluid
- Bad camshaft sensors
- Bad crankshaft sensors
- Open or shorted camshaft position sensor harness
- Faulty starter motor
- Weak battery
- Faulty starting system circuit
What are the symptoms of the P0348 code?
Some vehicle owners may only notice the illumination of the Check Engine Light. However, others may experience symptoms such as rough idling, choppy acceleration, decreased engine performance, a stalling engine, or a lack of power overall.
How does a mechanic diagnose the P0348 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
In most cases, a misdiagnosis comes in the form of a replaced sensor. While the sensors can often be the problem, these OEM parts do not fail as frequently as some technicians believe. It is important to diagnose every possible component, particularly the electrical components, before replacing any major part.
How serious is the P0348 code?
The camshaft is an essential part to the operation of the vehicle, and without the ability to properly control the position of the camshaft, the vehicle will experience larger problems. It is very important to address the cause of the P0348 code right away, before more damage occurs.
What repairs can fix the P0348 code?
In order to repair the P0348 code, a mechanic may attempt any of the following:
- Repairing any electrical components, such as wiring, that have been damaged by leaking engine fluid, as well as repairing the source of the leak
- Replacing bad camshaft sensors
- Replacing bad crankshaft sensors
- Repairing open or shorted camshaft position sensor harness
- Replacing a faulty starter motor
- Repairing or replacing a weak battery
- Replacing a faulty starting system circuit
Additional comments for consideration regarding the P0348 code
If either the camshaft or the crankshaft sensors are faulty, it is best to replace both units at the same time. These components work best when the wear is identical.
Need help with a P0348 code?
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