P0018: Crankshaft-Camshaft Correlation Bank 2 Sensor A
The P0018 code indicates that the Engine Control Module (ECM) has detected a misalignment between the crankshaft and the camshaft on Bank 2, Sensor A (typically the intake camshaft). This correlation error suggests the timing chain or belt may have jumped, or the variable valve timing (VVT) system is malfunctioning. Bank 2 refers to the cylinder bank opposite of cylinder #1. Sensor A is usually the intake camshaft position sensor. This code can lead to poor engine performance and potential internal damage if ignored.
01. Most Common Causes
- Timing chain/belt stretched or jumped a tooth
- Faulty camshaft or crankshaft position sensor
- Worn timing chain tensioner or guides
- Oil sludge or low oil pressure affecting VVT actuator
- Failed VVT solenoid or actuator on Bank 2
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Rough idle or engine misfire
- Reduced engine power and acceleration
- Hard starting or engine stalling
- Increased fuel consumption
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Inspect engine oil level and condition; check for sludge.
Step 3: Visually inspect timing chain/belt and tensioner for wear or slack.
Step 4: Test camshaft and crankshaft position sensors with a multimeter or oscilloscope.
Step 5: Check VVT solenoid and actuator operation on Bank 2.
Step 6: Perform a correlation test using a scan tool to compare crankshaft and camshaft positions.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
No, it is not safe. Driving with P0018 can cause further engine damage, including bent valves or catastrophic timing failure. Have the vehicle towed to a repair shop.
How much does it cost to fix?▼
Repair costs vary widely: $200-$400 for sensor replacement, $500-$800 for timing chain/actuator repairs, and up to $1500+ if internal engine damage occurred.