P0342 Camshaft Position Sensor “A” Circuit Low

DTC P0342 - OBD-II Data Sheet

P0342 - Low signal level in the camshaft position sensor circuit "A"

P0342 is a Diagnostic Trouble Code (DTC) for Camshaft Position Sensor Circuit Low Input. This can happen for several reasons and it is up to the mechanic to diagnose the specific cause of this code being triggered in your situation. Our certified mobile mechanics can come to your home or office to complete Check Engine Light diagnostics for $114,99 . Once we are able to diagnose the issue, you will be provided with an upfront cost for the recommended fix and receive a $20 rebate in Repair Credit. All of our repairs are covered by our 12 month / 12 mile warranty.

What does this mean?

This is a Generic Transmission Diagnostic Trouble Code (DTC), which means it applies to all makes / models from 1996 onwards. However, specific troubleshooting steps may differ from vehicle to vehicle.

The P0342 Automotive DTC is one of several common DTCs related to the Camshaft Position Sensor (CPS). Trouble Codes P0335 to P0349 are all generic codes related to the CPS, indicating various causes of failure.

In this case, code P0342 means that the sensor signal is too low or not strong enough. The signal is weak enough to be difficult to interpret. P0342 refers to the bank 1 "A" sensor. Bank 1 is the side of the engine that contains the #1 cylinder.

Description and relationship of crankshaft and camshaft position sensors

In modern cars, it is important to understand what these sensors are and how they interact. All vehicles without an ignition distributor use a crank and cam sensor instead of a module and escape wheel in the electronic distributor.

The crankshaft position (CPS) sensor signals to the ECM the position of the pistons relative to top dead center in preparation for fuel injection and spark plug ignition.

The camshaft position (CMP) sensor signals the position of the camshaft inlet with respect to the CPS signal and the opening of the inlet valve for fuel injection in each cylinder.

Description and location of sensors

Crank and cam sensors provide an "on and off" signal. Both have either Hall effect or magnetic functions.

The Hall effect sensor uses an electromagnetic sensor and a reactor. The reflector has the shape of small cups with squares cut on the sides, which resemble a picket fence. The reactor rotates when the sensor is stationary and placed very close to the reactor. Each time the pole passes in front of the sensor, a signal is generated, and when the pole passes, the signal is turned off.

The magnetic pickup uses a stationary pickup and a magnet attached to the rotating part. Each time a magnet passes in front of the sensor, a signal is generated.

Seats

The Hall Effect Crank Sensor is located on the harmonic balancer at the front of the engine. The magnetic pickup can be on the side of the engine block where it uses the center of the crankshaft for a signal, or it can be in the bell where it uses the flywheel as a trigger.

The camshaft sensor is fitted to the front or rear of the camshaft.

Note. In the case of GM vehicles, this code description is slightly different: it is a low input condition on the CMP sensor circuit.

Symptoms of a P0342 trouble code may include:

Symptoms may include:

• Check engine light (malfunction indicator lamp) and set code P0342.
• Lack of power
• stolling
• Hard start

Possible Causes P0342

Reasons for this DTC may include:

• Defective camshaft position sensor
• Sensor harness interrupted or shorted
• Poor electrical connection
• Defective starter
• Poor starter wiring
• Bad Battery

P0342 Diagnostic and Repair Procedures

Check Technical Service Bulletins (TSB) for any related to this code. The TSB is a list of complaints and failures that are dealt with at the dealer level and manufacturer-recommended fixes.

• Check the condition of the battery. Low battery power can cause a code to be set.
• Check all starter wiring. Look for corrosion, loose connections, or frayed insulation.
• Check the connector on the camshaft sensor. Look for corrosion and bent pins. Apply dielectric grease to the pins.
• Check the starter for excessive thrust indicating a weak starter.
• Replace the camshaft position sensor.

An example of a photo of a camshaft position (CMP) sensor:

Associated Camshaft DTCs: P0340, P0341, P0343, P0345, P0346, P0347, P0348, P0349, P0365, P0366, P0367, P0368, P0369, P0390, P0391, P0392, P0393. P0394.

Common Mistakes When Diagnosing Code P0342

Technicians report that the most common mistake is not a misdiagnosis, but the use of poor-quality spare parts. If a replacement sensor is required, it is better to use an OEM part rather than a discounted or used part of questionable quality.

How serious is the P0342 code?

Any problem that can make the engine run unstable and unpredictable should be taken very seriously. A misfiring engine or an engine that hesitates or loses power can be incredibly dangerous under normal driving conditions. Also, such poor performance, if left uncorrected long enough, can cause other engine problems that can lead to much longer and more expensive repairs down the road.

What repairs can fix code P0342?

When corrected in a timely manner, most repairs to a P0342 code are fairly straightforward and straightforward. These include:

• Recharging or battery replacement
• Repair or starter replacement
• Repair or replace faulty wiring or connectors
• Replacing a defective position sensorеcamshaft

Additional comments to consider regarding code P0342

The camshaft position sensor is an important part of the system that keeps your vehicle running smoothly and reliably. If for some reason it does not work properly, you will notice severe symptoms. They will only get worse over time, so it's important to fix the problem as soon as possible.

This is also important if you need to renew your vehicle registration in the near future. In many states, you will be required to take an OBD-II emission test once a year, or at least once every two years. If the Check Engine light is on, your vehicle cannot pass the test and you will not be able to complete registration until the problem is resolved. So it makes sense to do it sooner rather than later.

How to Fix P0342 Engine Code in 3 Minutes [2 DIY Methods / Only $9.78]

Need more help with your p0342 code?

If you still need help with DTC P0342, post a question in the comments below this article.

NOTE. This information is provided for informational purposes only. It is not intended to be used as a repair recommendation and we are not responsible for any action you take on any vehicle. All information on this site is protected by copyright.