What Does the P0016 Code Mean?
If your Check Engine Light is on and your OBD-II scanner displays P0016, your vehicle’s Engine Control Module (ECM) has detected that the crankshaft and camshaft timing are no longer synchronized within the manufacturer’s specified limits.
Modern engines constantly compare signals from the:
- Crankshaft Position Sensor (CKP)
- Camshaft Position Sensor (CMP)
These sensors allow the ECM to know exactly where the pistons and valves are at every moment.
If the relationship between these two sensors falls outside the expected range, the ECM stores Diagnostic Trouble Code (DTC) P0016.
P0016 is one of the most serious variable valve timing (VVT) codes and is common on GM, Chevrolet, GMC, Cadillac, Buick, Ford, Hyundai, Kia, Nissan, Toyota, BMW, Volkswagen, Audi, Subaru, Honda, Dodge, Jeep, and many other modern engines.
Quick Answer
| Item | Information |
|---|---|
| Code | P0016 |
| Description | Crankshaft Position – Camshaft Position Correlation (Bank 1 Sensor A) |
| Severity | ⭐⭐⭐⭐⭐ Very High |
| Safe to Drive? | No—repair immediately |
| Common Causes | Timing chain stretch, failed cam phaser, faulty timing components |
| Estimated Repair Cost | $100–$5,500+ |
What Does “Correlation” Mean?
The ECM expects the crankshaft and camshaft to maintain a precise relationship.
For example:
- Every crankshaft rotation corresponds to an exact camshaft position.
- Variable Valve Timing can slightly advance or retard cam timing.
- The ECM constantly verifies both sensors agree.
When they don’t, the ECM determines the engine timing is incorrect and stores P0016.
What Is Bank 1 Sensor A?
Understanding the terminology helps simplify diagnosis.
Bank 1
The side of the engine containing Cylinder #1.
Sensor A
The intake camshaft.
P0016 specifically refers to the relationship between:
- Crankshaft Position Sensor
- Intake Camshaft Position Sensor (Bank 1)
Symptoms of a P0016 Code
Common symptoms include:
- Check Engine Light
- Hard starting
- Engine won’t start
- Rough idle
- Engine rattling
- Poor acceleration
- Loss of power
- Reduced fuel economy
- Engine stalling
- Limp mode
Some engines may crank normally but refuse to start.
How Serious Is P0016?
Severity: ⭐⭐⭐⭐⭐ (Very High)
P0016 is among the most serious engine timing codes.
Ignoring it can lead to:
- Timing chain failure
- Bent valves (interference engines)
- Piston damage
- Engine failure
- Complete timing system failure
If accompanied by timing chain noise, repairs should be made immediately.
Can You Drive With P0016?
Not Recommended
If the engine still runs:
Drive only if absolutely necessary and only a short distance.
Stop Driving Immediately If
- Engine rattles loudly
- Timing chain noise develops
- Engine stalls
- Engine won’t restart
- Vehicle enters limp mode
- Oil pressure warning appears
Continuing to drive could result in catastrophic engine damage.
Most Common Causes of P0016
| Cause | Likelihood |
|---|---|
| Timing chain stretch | ⭐⭐⭐⭐⭐ |
| Failed timing chain tensioner | ⭐⭐⭐⭐⭐ |
| Worn timing guides | ⭐⭐⭐⭐ |
| Cam phaser failure | ⭐⭐⭐⭐ |
| Dirty engine oil | ⭐⭐⭐ |
| VVT solenoid failure | ⭐⭐⭐ |
| Faulty camshaft position sensor | ⭐⭐ |
| Faulty crankshaft position sensor | ⭐⭐ |
| Low oil pressure | ⭐⭐ |
| ECM failure | ⭐ |
Timing chain wear is the leading cause of P0016 on high-mileage engines.
Most Common Repairs
| Repair | Likelihood | Average Cost |
|---|---|---|
| Oil & Filter Change | Medium | $60–120 |
| Replace VVT Solenoid | Medium | $150–450 |
| Replace Camshaft Sensor | Medium | $150–400 |
| Replace Crankshaft Sensor | Medium | $150–400 |
| Replace Cam Phaser | High | $600–1,800 |
| Timing Chain Replacement | Very High | $1,200–4,000 |
| Engine Repair | Low | $3,500–7,500+ |
Tools You’ll Need
- Professional OBD-II Scanner
- Live Data Scan Tool
- Oscilloscope (Ideal)
- Digital Multimeter
- Oil Pressure Gauge
- Timing Locking Tools
- Service Manual
Step-by-Step Diagnosis
Step 1: Check Engine Oil
Inspect:
- Oil level
- Oil condition
- Correct viscosity
Dirty oil commonly affects Variable Valve Timing systems.
Step 2: Scan for Related Codes
Look for:
- P0010
- P0011
- P0014
- P0017
- P0340
- P0335
Multiple timing-related codes often indicate a mechanical timing issue.
Step 3: Listen for Timing Chain Noise
Pay attention during startup.
Listen for:
- Chain rattle
- Metallic knocking
- Timing cover noise
Startup rattles are classic signs of timing chain wear.
Step 4: Monitor Camshaft Data
Using live scan data compare:
- Desired cam angle
- Actual cam angle
Large differences indicate:
- Timing chain stretch
- Cam phaser failure
- VVT problems
Step 5: Test Camshaft & Crankshaft Sensors
Verify:
- Power supply
- Ground
- Signal output
- Connector condition
A failed sensor can mimic mechanical timing problems.
Step 6: Verify Mechanical Timing
If electronic components test properly:
Inspect:
- Timing chain alignment
- Timing marks
- Chain tension
- Camshaft phasers
Mechanical inspection often confirms the diagnosis.
Step 7: Check Oil Pressure
Low oil pressure can prevent proper VVT operation.
Verify oil pressure against factory specifications before replacing timing components.
Common Diagnostic Mistakes
Avoid these expensive mistakes:
- Replacing sensors before verifying timing
- Ignoring timing chain noise
- Replacing the ECM first
- Ignoring oil condition
- Skipping mechanical timing inspection
- Replacing cam phasers without checking chain stretch
Timing components should always be inspected before replacing expensive electronics.
Vehicle-Specific P0016 Problems
Chevrolet / GMC
Very common on:
- Equinox
- Malibu
- Traverse
- Acadia
- Silverado
Typical causes:
- Timing chain stretch
- Cam phasers
- VVT solenoids
Ford
Frequently caused by:
- Timing chain wear
- Cam phaser failure
- Oil pressure problems
Popular models:
- F-150
- Explorer
- Escape
- Expedition
Hyundai / Kia
Often associated with:
- Timing chain stretch
- CVVT actuator failure
- Oil sludge
BMW
Common issues:
- Timing chain guides
- VANOS system
- Camshaft sensors
Volkswagen / Audi
Frequently caused by:
- Timing chain tensioner failure
- Cam adjusters
- Timing chain stretch
Nissan
Common failures include:
- Timing chain wear
- Camshaft sensors
- VVT solenoids
Toyota
Often related to:
- VVT-i actuator
- Camshaft sensor
- Timing chain wear (high mileage)
Repair Costs
| Repair | Average Cost |
|---|---|
| Oil Change | $60–120 |
| Camshaft Sensor | $150–400 |
| Crankshaft Sensor | $150–400 |
| VVT Solenoid | $150–450 |
| Cam Phaser | $600–1,800 |
| Timing Chain | $1,200–4,000 |
| Engine Repair | $3,500–7,500+ |
Related Trouble Codes
P0016 frequently appears with:
- P0010 – Intake Camshaft Actuator Circuit
- P0011 – Intake Camshaft Timing Over-Advanced
- P0014 – Exhaust Camshaft Timing Over-Advanced
- P0017 – Crankshaft/Camshaft Correlation (Bank 1 Exhaust)
- P0335 – Crankshaft Position Sensor Circuit
- P0340 – Camshaft Position Sensor Circuit
Frequently Asked Questions
Does P0016 always mean the timing chain is bad?
No.
While timing chain stretch is the most common cause, faulty camshaft sensors, crankshaft sensors, VVT solenoids, low oil pressure, or worn cam phasers can also trigger the code.
Can low oil cause P0016?
Yes.
Low or dirty engine oil can affect Variable Valve Timing operation and contribute to camshaft timing errors.
Can I drive with P0016?
It’s not recommended.
Driving with incorrect valve timing can cause severe engine damage, especially on interference engines.
Will replacing the camshaft sensor fix P0016?
Only if testing confirms the sensor has failed. Replacing sensors without verifying mechanical timing often wastes time and money.
How much does it cost to fix P0016?
Repairs range from about $100 for a sensor issue to over $4,000 for a timing chain replacement, depending on the root cause.
Final Thoughts
The P0016 Crankshaft Position – Camshaft Position Correlation (Bank 1 Sensor A) code is one of the most important engine timing codes you’ll encounter. While something as simple as a faulty sensor or dirty oil can occasionally be responsible, timing chain stretch, worn cam phasers, and mechanical timing problems are much more common—especially on high-mileage engines.
Before replacing expensive parts, verify oil condition, inspect for timing chain noise, compare commanded and actual camshaft angles with a scan tool, and confirm mechanical timing if necessary. A systematic diagnosis can prevent catastrophic engine damage and save thousands of dollars in unnecessary repairs.
