P1349 - FAULT CODE - OBD2

P1349 BUICK, CADILLAC, CHEVROLET, GMC: INTAKE CAMSHAFT POSITION SYSTEM CONDITIONS

The camshaft uses some lobes known as cams, which are driven against the valves so that they open as the shaft rotates. The valve springs are the ones that return the valves to their closed position. This system is critical, and it significantly affects the engine performance at different speeds.

In internal combustion engines, they are usually installed on the cylinder banks where they act to control the valves. Their calibration precisely adjusts the amount of air-fuel mixture entering the chamber, and how efficiently the exhaust gases used from the previous ignition could leave the chamber to make way for the next load. Taking into account the constant opening and closing of the valves, they must be carefully synchronized with the movements of the pistons. To ensure synchronization, the camshafts are connected through a chain or timing belt to the rotation of the crankshaft, which moves the pistons directly within the crankshaft.

When the diagnostic code P1349 OBD2 is set, it is because during the engine operation and an Engine Coolant Temperature (ECT) sensor input greater than 158°F, the Powertrain Control Module did not detect any change in the camshaft synchronization with the active CMP actuator, or if the camshaft synchronization was fixed for more than 20 seconds.

• Check Engine lamp illumination.
• The engine is unstable.
• A decrease in engine oil pressure.
• Significant loss of fuel efficiency.

The reasons for setting the fault code P1349 OBDII are

• The available amount of engine oil may not be enough.
• The Camshaft Position Sensor connectors or wiring may be damaged.
• The Camshaft Position Sensor circuit may have bad connections, causing an open or short circuit.
• The CMP sensor may be defective.

The steps to solve the DTC code P1349 OBDII are the following:

• See the Technical Service Bulletins.
• Check that the engine has enough oil. If it is not within an appropriate level, look for signs of leakage. Correct as necessary.
• Check the condition of cables and connectors related to the CMP Sensor. If you find corrosion, wear, or burn damage on any of these, make repairs.
• Measure the voltages of the Camshaft Position Sensor circuit and check if they match the manufacturer's specifications. If you find a value outside the parameters, make the necessary corrections.
• Verify the integrity of the Camshaft Position Sensor. Follow the manufacturer's steps for such verification and if you note it is damaged, replace it.