Crankshaft/Camshaft Loss Of Synchronization

Common symptoms

What you'll notice

• Check the timing belt/chain for wear or damage and replace if necessary.
• Inspect the crankshaft and camshaft position sensors for proper alignment and functioning. Clean or replace as needed.
• Check the wiring and connections for the crankshaft and camshaft position sensors. Repair or replace any damaged or loose wiring.
• Verify the engine's timing by using a timing light and adjusting if necessary.

Common causes

Most likely first

1. Faulty crankshaft or camshaft position sensor
2. Timing belt or chain is worn or damaged
3. Engine control module (ECM) or powertrain control module (PCM) malfunction
4. Damaged or faulty wiring or connectors in the crankshaft or camshaft position sensor circuit
5. Mechanical failure in the engine, such as a seized or damaged crankshaft or camshaft

How to diagnose & fix

Work through it in order

1. Engine misfires or runs rough
2. Engine stalls or has difficulty starting
3. Decreased engine performance or power
4. Poor fuel efficiency
5. Illuminated check engine light