P0337 - CRANKSHAFT POSITION SENSOR A CIRCUIT LOW INPUT

The ECM (Engine Control Module) measures the amount of fuel to be injected in relation to the amount of air measured at any given time. Then, it forces a spark to ignite a power stroke.

The Crankshaft Position Sensor (CKP) is used to calculate the engine speed in Revolutions Per Minute (RPM) and to determine the position of cylinder one at Top Dead Center (TDC). By having the RPM and TDC, the ECM can control the precise function required for the vehicle to work properly.

If the ECM does not detect sufficient voltage from the CKP Sensor, the DTC P0337 OBDII code will be set.

• Check Engine light ON.
• The time to start the engine may be longer than normal, or the engine may not start.
• Fuel efficiency drops.
• Loss of engine power.
• Problems during acceleration.

Reasons to set the P0337 OBD2 fault code:

• The CKP (Crankshaft Position Sensor) may be in poor condition.
• The alignment of the CKP Sensor may not be right.
• The battery charge level may be too low.
• There may be a short circuit related to the system.

To troubleshoot problems related to the P0337 OBDII diagnostic code, try this:

• Check all the cables and connectors for burn spots or wear. Make any necessary adjustments.
• Check the voltage of the CKP Sensor. There should be 5 volts reference, a ground signal, and one or more output circuits. Check the data with the manufacturer's manual. If the data does not match, make the appropriate repairs.
• Unplug the electrical connector from the CKP Sensor and test the resistance. If it does not match the manufacturer's specifications, you should replace the sensor.
• Check that the battery is charged.