P0017 — Crankshaft/Camshaft Position Correlation (Bank 1 Sensor B)

Quick Answer

• What it means: The engine control module (ECM) has detected an issue with the timing correlation between the crankshaft and camshaft on Bank 1, exhaust side.
• Severity: Get towed; continued driving can lead to severe engine damage.
• Most common cause: Incorrect timing due to a stretched timing chain or belt.

What the P0017 code means

The P0017 diagnostic trouble code stands for "Crankshaft Position - Camshaft Position Correlation (Bank 1 Sensor B)." In plain English, this means your car's computer has detected that the crankshaft and camshaft are out of sync. The crankshaft controls the pistons, and the camshaft controls the valves (intake and exhaust). For an engine to run efficiently and powerfully, these two components must rotate in a precise, synchronized manner. "Bank 1" refers to the side of the engine that contains cylinder #1, and "Sensor B" typically refers to the exhaust camshaft position sensor.

The ECM uses signals from both the crankshaft position sensor and the camshaft position sensor(s) to monitor their relative positions. When these signals don't align within the manufacturer's specified parameters, indicating a timing issue, the P0017 code is triggered, and the check engine light illuminates.

Common symptoms

• Check Engine Light illuminated
• Rough idle or stalling
• Reduced engine performance (lack of power, poor acceleration)
• Difficulty starting the engine
• Increased fuel consumption
• Engine knocking or ticking noises
• Engine may not start at all

Common causes

1. Stretched timing chain or worn timing belt: Over time, timing chains can stretch, or timing belts can wear, causing a loss of proper tension and throwing off the Crankshaft/Camshaft synchronization. This is the most prevalent cause.
2. Faulty camshaft position sensor: A sensor providing inaccurate readings can lead the ECM to believe there's a correlation issue even if the mechanical timing is fine.
3. Faulty crankshaft position sensor: Similar to the camshaft sensor, a defective crankshaft sensor can send incorrect data, leading to a P0017 code.
4. Variable Valve Timing (VVT) actuator/solenoid issues: If your vehicle has VVT, a malfunctioning VVT actuator or solenoid can affect camshaft timing, leading to correlation errors.
5. Oil sludged VVT phaser/actuator: Lack of proper oil changes can lead to sludge buildup, which can restrict the movement of VVT components, causing timing issues.
6. Low engine oil pressure: VVT systems often rely on oil pressure to adjust camshaft timing. Insufficient oil pressure can prevent proper VVT operation.
7. Mismatched components after engine work: If major engine components (like cylinder heads or camshafts) have been replaced, and the wrong parts were used or installed incorrectly, it could lead to timing issues.
8. Damaged wiring or connectors: Frayed wires or corroded connectors affecting either sensor or VVT components can disrupt signals and trigger the code.

How a technician diagnoses it

1. Verify the complaint and perform a visual inspection: The technician will first confirm the check engine light is on and visually inspect for obvious issues like loose timing chain tensioners, damaged wiring, or low engine oil.
2. Scan for codes and freeze frame data: A diagnostic scanner will be connected to retrieve the P0017 code and any other stored codes. Freeze frame data will be analyzed to see what engine conditions (RPM, engine load, temperature) were present when the code was set.
3. Monitor live sensor data: The technician will observe live data from the crankshaft and camshaft position sensors to compare their readings. They will look for inconsistencies or erratic signals between the exhaust camshaft (Sensor B, Bank 1) and the crankshaft.
   • Good values: Sensor readings should show consistent and synchronized patterns, with the camshaft position typically tracking the crankshaft position within a few degrees of the specification.
   • Bad values: Inconsistent, jumpy, or significantly out-of-sync readings between the sensors over time will indicate a problem.
4. Perform VVT system tests: If applicable, the technician will use the scan tool to command VVT actuator movements and monitor their response. They will check for proper oil pressure within the VVT system.
5. Inspect timing components: If sensor data appears normal, or if there