P0016 Code: Crankshaft Camshaft Correlation – Causes & Fixes

Code P0016 is one of the more serious OBD-II diagnostic trouble codes you can encounter. It indicates that your engine’s crankshaft and camshaft are not synchronized—they’re not turning in the proper relationship to each other. This timing correlation is critical for proper engine operation, and when it goes wrong, your engine won’t run correctly and may not run at all.

What Does P0016 Mean?

P0016 stands for “Crankshaft Position Camshaft Position Correlation Bank 1 Sensor A.” Breaking this down:

• Crankshaft Position: The position of the crankshaft, which drives the pistons up and down
• Camshaft Position: The position of the camshaft, which opens and closes the intake and exhaust valves
• Correlation: The timing relationship between these two components
• Bank 1: The side of the engine containing cylinder #1
• Sensor A: The primary camshaft position sensor for that bank

Your engine’s computer (PCM) constantly monitors the relationship between the crankshaft and camshaft using their respective sensors. The camshaft must turn at exactly half the speed of the crankshaft, and the timing must be precise. When the PCM detects that these two components are out of sync, it sets code P0016.

Common Symptoms

• Check engine light illuminated on the dashboard
• Rough idle or rough running throughout the RPM range
• Loss of engine power or acceleration
• Engine hesitation or stumbling
• Possible no-start condition (if timing chain has jumped significantly)
• Engine knocking or pinging
• Reduced fuel economy
• Possible rattling noise from the front of the engine (timing chain related)

Possible Causes (Ranked by Frequency)

1. Stretched Timing Chain – Over time, timing chains wear and stretch. This is the most common cause of P0016. A stretched chain causes the camshaft to lag behind the crankshaft, throwing off the timing correlation.
2. Timing Chain Jumped a Tooth – If the timing chain slips on its sprockets, the camshaft can be off by one or more teeth, completely disrupting the timing relationship. This is a serious condition that can cause severe engine damage.
3. Camshaft Phaser Stuck or Malfunctioning – Many modern engines use variable valve timing (VVT) with camshaft phasers that adjust timing electronically. If the phaser gets stuck or fails, the camshaft timing won’t adjust properly.
4. Crankshaft Position Sensor Failure – A faulty crankshaft sensor can send incorrect timing signals to the PCM, causing it to think the timing is off when it may actually be correct.
5. Camshaft Position Sensor Failure – Similarly, a bad camshaft sensor can report incorrect timing information, triggering the P0016 code.
6. VVT System Malfunction – Issues with the variable valve timing solenoid, wiring, or oil control valve can prevent proper camshaft timing adjustment.
7. Low Engine Oil – The VVT system relies on proper oil pressure. Low oil can cause the system to malfunction.
8. Timing Chain Guide or Tensioner Failure – Worn guides or a failed tensioner can allow the chain to slip or become misaligned.

Diagnostic Steps

Here’s how a professional mechanic will typically diagnose P0016:

Step 1: Scan for Additional Codes

The mechanic will scan your vehicle with a diagnostic scanner to see if there are other related codes present. Codes like P0014, P0015, P0017, P0018, P0335, or P0340 can help pinpoint the exact cause.

Step 2: Check Engine Oil Level and Condition

Low or dirty oil can cause VVT system issues. The mechanic will check the oil level and condition first, as this is a quick and inexpensive check.

Step 3: Inspect Sensor Connectors and Wiring

Loose or corroded connections on the crankshaft or camshaft position sensors can cause P0016. The mechanic will visually inspect and test the connectors.

Step 4: Test the Sensors

Using a multimeter or oscilloscope, the mechanic will test the crankshaft and camshaft position sensors to verify they’re functioning correctly and sending proper signals.

Step 5: Check VVT System Components

If equipped with VVT, the mechanic will test the solenoid, oil control valve, and wiring to ensure the system is functioning properly.

Step 6: Perform Timing Verification

Using a timing light or advanced diagnostic equipment, the mechanic will verify the actual timing of the engine. This may require removing the timing cover or accessing timing marks.

Step 7: Inspect Timing Chain

If timing is confirmed to be off, the timing cover will need to be removed to visually inspect the timing chain, sprockets, guides, and tensioner for wear or damage.

Repair Cost Estimates

The cost to repair P0016 varies dramatically depending on the underlying cause:

• Sensor Replacement: $150–$400 (parts and labor) – This is the least expensive fix if a sensor is the culprit.
• VVT System Repair: $300–$800 – Replacing a solenoid, oil control valve, or wiring harness.
• Timing Chain Replacement: $1,500–$3,500 – This is a major repair requiring removal of the timing cover and significant labor. Some vehicles are more expensive than others.
• Timing Chain and Related Components: $2,500–$5,000+ – If the chain has jumped or caused damage to sprockets, guides, or tensioners, costs can exceed $5,000.
• Engine Replacement: $3,000–$8,000+ – In rare cases where the timing chain failure has caused severe internal engine damage, engine replacement may be necessary.

Note: These are estimates for typical vehicles. Luxury brands, high-performance engines, and vehicles requiring extensive disassembly may cost significantly more.

Can I Still Drive?

Severity: Moderate to High

Whether you can safely drive with P0016 depends on the underlying cause and severity:

• Sensor Failure: If it’s just a sensor issue, the car may run poorly but can usually be driven to a repair shop, though not recommended for long distances.
• Stretched Timing Chain: A slightly stretched chain may allow the vehicle to run, but it’s not safe for extended driving. The timing will continue to degrade, and severe engine damage could result.
• Jumped Timing Chain: If the chain has jumped significantly, the engine may not start at all or may run so poorly that it’s undrivable. Do not attempt to drive the vehicle.
• VVT System Malfunction: The car may be drivable but will run rough and have reduced power. Driving should be limited to getting to a repair shop.

Recommendation: Do not ignore P0016. Have the vehicle diagnosed by a professional mechanic as soon as possible. Continuing to drive with a timing issue can cause catastrophic engine damage, turning a $1,500 repair into a $5,000+ engine replacement.

Frequently Asked Questions