Fault code P0016 – a step-by-step guide to diagnosing and fixing it

DTC P0016 is triggered when the powertrain control module determines that the signal coming from the camshaft position (CMP) sensor does not correspond with the one from the crankshaft sensor. The camshaft and crankshaft should always be moving in synchronisation, and their positions directly affect the ignition and exhaust processes.

• A bad CMP or CKP sensor. If either of these devices are malfunctioning, they could send a false signal, disrupting timing calculations. It can be the result of wire damage and oxidation on the electrical contacts, etc.
• Defective valve train components. For example, a stretched timing belt or chain, pulley misalignment, worn gears, and a faulty tensioner.
• Clogged oil passages. This can occur if the motor oil or car oil filter isn’t changed on time. Contaminants build up and the oil will start to break down. A lack of oil can stop the camshaft from rotating properly and cause components to wear out quicker.
• A faulty reluctor ring. The component is used to determine the crank angle.
• A jammed phaser mechanism or control valve.

• A decrease in engine power
• Decreased fuel efficiency
• Difficulty starting the vehicle
• A rough engine
• A noisy timing chain or rattling sound
• Stalling or hesitation

• First check the DTCs using an OBD2 scan tool. Connect the diagnostic scanner via the vehicle’s data link connector and decipher each code to determine specific faults.
• Check the condition and amount of motor oil left in the reservoir. The lubricant should be fairly clear with no visible contamination. If necessary, flush the system, replace the filter and change the lubricant. Make sure that the viscosity is correct.
• It is possible that there is an issue with the reluctor ring. Make sure the component is secured in the right place and look for any signs of damage. Replace it if necessary.
• Next, you will need to take a look at the wires and electrical connectors connected to the sensors. Cracked, burnt out or deformed parts will need to be replaced. If there are traces of oxidation around the contacts, they should be cleaned using a specialised cleaning agent. You can test whether the devices are working properly with a multimeter or an oscilloscope.
• Replace any worn valve train components. You should also adjust the tension of the belt or chain if required.