The P0341 trouble code indicates your vehicle’s ECM has detected a problem with the signal coming from the Camshaft Position Sensor. It is very important that the ECM detects a valid and accurate signal from the cam sensor, as it is used to control fuel injector and ignition timing. If you are experiencing a P0341 trouble code read on for details on how to diagnose and repair the problem.
P0341 Code Definition
P0341 Code Definition (Generic): Camshaft Position Sensor “A” Range/Performance
What Does P0341 Mean?
The Camshaft Position Sensor is an important input to the Engine Control Module. It allows the ECM to monitor the exact position of your engine’s camshaft, allowing it to make adjustments to fuel injector and ignition timing. When the signal is present, but out of a specified range, or missing altogether, a P0341 will be set. This is usually accompanied by a long crank to start or an engine that will not start at all.
What Are The Symptoms Of The P0341 Code?
P0341 can possibly cause many driveability symptoms. Some of the more common symptoms are:
- Illuminated check engine light
- Long crank to start
- No start
What Are The Causes Of P0341?
- Defective Camshaft Position Sensor
- Faulty wiring
- Improper air gap/installation
How Serious Is The P0341 Trouble Code?
P0341 is a serious trouble code. This code can cause your vehicle to stall or not run at all. The camshaft position sensor is a critical input to the ECM and should be diagnosed and repaired right away.
How To Diagnose And Fix The P0341 Code
- Use a scan tool to scan for trouble codes and record freeze frame data. If there are other codes related to camshaft or crankshaft timing, they can be useful in helping diagnose P0341.
- Perform a thorough visual inspection of all related wiring. Check for any broken or chafed wiring, misrouted harnesses, and make sure that all connectors are tight and not corroded. Also, verify that the Camshaft Position Sensor is properly installed and seated flush.
- Next, check the internal resistance of the sensor. To do this set your DVOM to ohms and disconnect the connector for the Cam Sensor. Using a wiring diagram test the resistance across the sensor signal terminal and the sensor ground terminal. If resistance is infinite, or the circuit is open, the sensor should be replaced. If not, verify the specification in your service manual.
- If the sensor passes the resistance test, depending on the sensors circuit configuration on your vehicle, you may have a 5 volt reference signal. Check your wiring diagram and verify that this terminal has 5 volts coming from the ECM with the ignition key in the run position.
- The best way to verify the Camshaft Position Sensor signal is to use an oscilloscope to give yourself a visual waveform of the signal. But this is a rather advanced diagnostic tool that most non-professional technicians don’t have access to. You can get a rough idea of the signal health by checking it with your DVOM set to AC voltage, a reading in the millivolts indicates that the sensor is at least producing a signal.
- If none of these tests produce any results, it is possible that you are dealing with a valve timing issue. A vehicle that has not been properly maintained, such as not replacing a timing belt at the suggested interval, or lack of oil changes on a vehicle equipped with a timing chain, it is likely that the belt or chain has jumped teeth on one of its gears. This can be checked by disassembling the engine enough to visually check the timing marks on the cam and crankshaft. Or, using an oscilloscope to compare the cam and crank sensor signals.
Common Mistakes To Avoid While Diagnosing The P0341 Code
When diagnosing a P0341 trouble code, it is important to make sure the wiring is properly routed and not pulled too tightly or chafing on other components. Also, a faulty Crankshaft Position Sensor has been known to cause P0341 on certain vehicles. It is always a good idea to verify Crankshaft Position Sensor operation when diagnosing a P0341.
Tips To Avoid P0341 In The Future
To help avoid P0341 in the future, always route wiring harnesses in their original position to avoid wires and connectors from being stretched or rubbing on other components. And following the manufacturer’s maintenance schedule will reduce the risk of having any actual valve train timing problems.