P0339 - CRANKSHAFT POSITION SENSOR B CIRCUIT INTERMITTENT

Diagnostic code P0339 OBDII indicates that the Powertrain Control Module (PCM) has found an erratic or intermittent voltage signal from the Crank Position Sensor (CKP). When an OBD2 system uses multiple CKP sensors, the sensor “B” refers to sensor number two.

The CKP sensor monitors both engine speed and crankshaft position. The position of the crankshaft is important, as it is used by the PCM to calculate the ignition spark timing. The crankshaft position sensor (CKP) has a slip ring that passes very close to its magnetic tip as the crankshaft rotates. When this happens, an electromagnetic circuit is completed which briefly interrupts the circuit. These circuit interruptions are recognized by the PCM as a wave pattern, which represents voltage variations.

The input signals of the CKP sensor are constantly monitored by the PCM. If the input voltage turns out to be below the set level for a period of time, the DTC code P0339 is set.

• MIL (engine malfunction) light on.
• It increases fuel consumption.
• If the vehicle is equipped with a tachometer, it does not display the RPM.
• It lowers engine performance.
• Acceleration problems.

The reasons for setting the fault code P0339 OBD2 are

• Crank Position Sensor (CKP) cables with defects.
• CKP sensor connector corroded or may have fluid present.
• The CKP sensor may be defective.

To solve the failures caused by the DTC code P0339 OBDII, you must take into account the following issues:

• It performs an inspection of all the cables, as well as the connectors belonging to the circuit. One of these components may be defective or perhaps items such as motor oil, coolant or others may be causing a short circuit. Repair or replace them if necessary.
• Find a diagram of the cable system and check the voltage of the CKP sensor. This is usually a 5-volt reference for proper operation. Still check the ground supply. Compare the results of these readings to the specifications. Repair if you find deficiencies in one of these circuits.
• With a DVOM it checks the resistance of the crankshaft position sensor (CKP). Using the comparative specifications, if it is not within these specifications the sensor may be defective, so change it.