P0019 on 2015-2018 Lincoln MKX: Causes and Fixes for Cam/Crank Correlation

What's Unique About the 2015-2018 Lincoln MKX

For this generation of Lincoln MKX and other Ford/Lincoln vehicles, the Variable Camshaft Timing (VCT) system is particularly sensitive to oil condition. Ford has issued multiple Technical Service Bulletins (TSBs), such as SSM 48423 and SSM 50067, stating that P0019 and a dozen related codes are frequently caused by small debris in the engine oil, which causes the VCT solenoids to stick. These TSBs specifically advise technicians *not* to replace components immediately, but to first use a scan tool to command the affected solenoid on and off (cycle it 10 times) to try and dislodge the debris. This official guidance makes oil quality the primary suspect and VCT solenoid failure a much more common cause than a major mechanical issue like a stretched timing chain.

Diagnostic Flowchart

Tap your situation to follow the diagnostic path that matches what you're seeing on this vehicle.

Generation note: The 2015 model year is the end of the first generation MKX and came only with a 3.7L V6 engine. The 2016-2018 models are the second generation and were available with either the base 3.7L V6 or an optional 2.7L EcoBoost twin-turbo V6. The causes and fixes for P0019 are similar across these engines as they all use a VCT system susceptible to the oil debris issues described in Ford's TSBs.

Symptoms You May Notice

• Check Engine Light is on
• Rough or erratic idle
• Engine hesitation or sluggish acceleration
• Reduced engine power
• Decreased fuel economy
• Engine may stall at low speeds
• Engine rattling or knocking noises, especially at idle

Most Likely Causes

1. Low or Dirty Engine Oil 🔴 High Probability The VCT system is hydraulically operated by engine oil. Low pressure or contaminated oil directly impairs its function. This is the root cause of the debris issue mentioned in multiple TSBs and should always be the first check.
   How to confirm: Check the engine oil dipstick. If the oil is below the 'add' mark, dark black, or feels gritty, it needs to be changed. Even if it looks clean, it may be the wrong viscosity or contain contaminants.
   Typical fix: Perform an engine oil and filter change using the manufacturer-recommended oil grade (e.g., 5W-30 for EcoBoost) and a high-quality filter. Clear the codes and see if P0019 returns.
   Est. part cost: $40-$80
2. Sticking or Failed VCT Solenoid (Bank 2 Exhaust) 🔴 High Probability As cited in TSBs SSM 48423, SSM 50067, and others, these solenoids are known to stick due to oil contamination, making this the most common parts failure for this code.
   How to confirm: A good diagnostic step is to swap the Bank 2 exhaust VCT solenoid with the Bank 2 intake solenoid. Clear the codes and drive the vehicle. If the code changes to P0018 (Intake Camshaft Correlation), the solenoid is confirmed faulty. 🎬 See this walkthrough on replacing VCT solenoids to fix hesitation. A scan tool can also be used to command the solenoid on and off to check for a response, as recommended by Ford's TSBs.
   Typical fix: Replace the Bank 2 exhaust VCT solenoid and change the engine oil and filter.
   Est. part cost: $40-$100
3. Faulty Camshaft Position Sensor (Bank 2 Exhaust) 🟡 Medium Probability While less common than a solenoid failure, the sensor that reads the camshaft's position can fail, sending incorrect data to the PCM.
   How to confirm: Test the sensor's resistance with a multimeter against specifications or swap it with the intake sensor on the same bank to see if the code changes to P0018. A visual inspection for oil contamination in the connector is also recommended.
   Typical fix: Replace the Bank 2 exhaust camshaft position sensor. 🎬 Watch: How to replace the camshaft position sensor on an MKX.
   Est. part cost: $30-$70
4. Stretched Timing Chain or Worn Timing Components ⚪ Low Probability At higher mileage (typically over 100,000 miles), the timing chain can stretch, or the guides and tensioners can wear out. This creates slack and causes a correlation error. This is a known, though less common, issue on both the 3.7L and 2.7L engines.
   How to confirm: This is difficult to confirm without disassembly. A rattling or whirring noise from the front of the engine, especially on a cold start, is a strong indicator. This diagnosis should only be considered after ruling out oil, VCT solenoid, and sensor issues.
   Typical fix: Replace the timing chain, tensioners, and guides. This is a complex and labor-intensive job.
   Est. part cost: $400-$800

Rare But Worth Checking

• Damaged Camshaft Phaser: The phaser is the gear on the end of the camshaft that is adjusted by the VCT solenoid. If it fails internally or its locking pin breaks, it can get stuck in one position, causing a timing correlation error. This is a known failure point, especially on the 2.7L EcoBoost, sometimes manifesting as a cold start rattle.
• Wiring or Connector Issue: Damage or corrosion to the wiring harness for the VCT solenoid or camshaft position sensor can cause an intermittent signal and trigger the code. A user on a forum reported a persistent P0019 after pinching a sensor pigtail during a valve cover re-installation.

Diagnosis Steps

1. Check the engine oil level and condition. If it is low, dirty, or past its change interval, perform an oil and filter change with the correct manufacturer-specified oil, clear the code, and see if it returns.
2. Use an OBD-II scanner to check for any other accompanying fault codes.
3. Inspect the wiring and connectors for the Bank 2 (front of engine) exhaust camshaft position sensor and VCT solenoid for any visible damage, corrosion, or loose connections.
4. Use a scan tool with live data/actuator test capability. As per Ford TSBs (SSM 50067), command the Bank 2 exhaust VCT solenoid on and off 10 times to try and clear any internal debris. Monitor the desired vs. actual camshaft position PIDs for Bank 2.
5. As a practical test, swap the Bank 2 exhaust VCT solenoid with the Bank 2 intake VCT solenoid. They are typically identical and located next to each other on the valve cover. Clear the codes. If the code returns as P0018 ('Intake' correlation error), the solenoid you moved is faulty and must be replaced.
6. If the code remains P0019 after the solenoid swap, test the camshaft position sensor. You can swap it with the intake sensor on the same bank or test its resistance with a multimeter against specifications.
7. If all sensors and solenoids test good and the oil is clean, the issue may be mechanical. Listen for any rattling noises from the front of the engine (timing cover area) on a cold start, which could indicate a timing chain problem. At this stage, professional diagnosis is recommended to inspect the timing chain, tensioners, and phasers.

Parts You'll Likely Need

• Variable Camshaft Timing (VCT) Solenoid (OEM #AT4Z-6M280-B) — This is the most common part to fail for this code on this vehicle, as it is prone to sticking from oil debris, a fact documented in multiple manufacturer TSBs. This part number fits many 3.5L and 3.7L Ford/Lincoln applications.
  Trusted brands: Motorcraft, Dorman (917-198), SKP, NTK (VV0004)
  OEM price range: $70-$100
  Aftermarket price range: $40-$80
• Camshaft Position Sensor (OEM #BL3Z-6B288-C) — If the VCT solenoid is not the cause, the sensor that reads the camshaft's position may have failed, sending incorrect data to the computer. This part number is listed for the 2016-2018 MKX with both 2.7L and 3.7L engines.
  Trusted brands: Motorcraft, Bosch, Duralast (SU14627), ACDelco
  OEM price range: $30-$50
  Aftermarket price range: $25-$40

Related Codes That Often Appear With This One

• P0017 — This is the same correlation error but for Bank 1 (firewall side on the MKX). If both P0017 and P0019 appear together, it points to a systemic issue like very low oil pressure or a stretched timing chain affecting both banks.
• P0018 — This is a correlation error for the intake camshaft on Bank 2. Seeing it with P0019 suggests a problem affecting the entire bank, such as a phaser issue, or could be a result of swapping a faulty exhaust solenoid to the intake position for diagnosis.
• P0025 — This code means 'Exhaust (B) Camshaft Position Timing - Over-Retarded (Bank 2)'. It often appears with P0019 and reinforces that the timing on that specific camshaft is incorrect. TSB 16-0038 even notes that if P0019 and P0025 appear together on a low-mileage vehicle, the VCT solenoid should be replaced.

Technical Service Bulletins (TSBs) & Recalls

• SSM 50067: For 2015-2021 Ford/Lincoln vehicles, states that codes like P0019 may be due to small debris causing the VCT solenoid to stick. It advises using pinpoint test HK12 to cycle the solenoid 10 times to attempt to clear debris before replacement.
• SSM 48423: For 2015-2020 Ford/Lincoln vehicles, gives nearly identical advice to SSM 50067, pointing to debris in the oil sticking the VCT solenoid and recommending cycling the solenoid via diagnostics before replacement.
• SSM 47170: An earlier TSB for 2015-2018 vehicles that also identifies sticking VCT solenoids due to oil debris as the cause for P0019 and other timing codes.

Platform-Specific Known Issues

• TSB SSM 50067, SSM 48423, and SSM 47170 all state that P0019 on 2015-2021 Ford and Lincoln vehicles may be caused by small debris in the engine oil causing the VCT solenoid to stick. They recommend cycling the solenoid with a scan tool before replacement.

Mechanic-Grade Diagnostic Values

• VCT Solenoid Internal Resistance — expected: 5.0 to 14.0 ohms. A tighter, more ideal range is 6.9 to 7.9 ohms.. Failure: A reading of 0 ohms (short circuit) or OL/infinite (open circuit) indicates a failed solenoid.
• Engine Oil Pressure at Hot Idle — expected: Minimum of 15 PSI.. Failure: Pressure below 15 PSI can cause the cam phasers to operate incorrectly or oscillate, triggering timing codes.
• Ford IDS Scan Tool Live Data: VCT_ADV_ERR PID — expected: Should hover near 0° with a tolerance of +/- 5° during closed-loop operation.. Failure: A consistent, large deviation from 0° on the Bank 2 exhaust cam confirms a real-time correlation error.
• VCT Solenoid Connector Voltage (Key On, Engine Off) — expected: Greater than 10.0 volts on the power supply pin.. Failure: Low or no voltage points to a problem in the power supply circuit (fuse, wiring) rather than the solenoid itself.
• Camshaft Position Sensor Resistance (General) — expected: Typically 1-4 kOhms for a generic 2-wire sensor.. Failure: A reading outside the specified range in the service manual suggests a faulty sensor.

Scan Tool Commands That Help

• Ford IDS (or equivalent like FORScan): Output State Control for VCT Solenoid / VCT Solenoid On/Off Cycle Test — This bidirectional command is recommended by Ford TSBs (SSM 50067, referred to as Pinpoint Test HK) to manually cycle the solenoid up to 10 times. It can dislodge small debris causing the solenoid to stick, potentially fixing the issue without parts replacement and confirming if the solenoid is the sticking point.
• Ford IDS (or equivalent): Monitor PID: VCT_ADV_ERR (VCT Advance Error) — Use this to see the real-time difference between the PCM's desired camshaft angle and the actual angle reported by the sensor. A persistent error value outside of +/- 5 degrees for the Bank 2 exhaust cam confirms the fault is currently active.

Wiring & Ground Locations

• Bank 2 VCT Solenoid and Cam Sensor Connectors — On the front valve cover of the engine, closer to the radiator. The exhaust components are typically located on the lower or outer side of the cylinder head.. These connectors and their pigtails are exposed to heat and vibration. A damaged wire, corroded pin, or loose connection can interrupt the signal or control to the component, directly causing code P0019.
• Engine Ground (e.g., G104) — A primary engine-to-chassis ground is typically located on the engine block or cylinder head and connects to the vehicle's frame or firewall. An official service manual is required for the exact location of specific grounds like G104.. A poor ground connection for the engine block or PCM can create electrical noise and voltage discrepancies, causing the PCM to receive inaccurate signals from the cam and crank sensors, leading to a false correlation code.

Real Owner Repair Stories

• fordedgeforum.com user (2017 Ford Edge 3.5L V6 (transverse V6 similar to MKX)) — Check Engine Light with code P0019.
  ❌ Tried (didn't work) Initial diagnosis pointed towards a timing issue.
  ✅ What actually fixed it Following forum advice, the owner replaced the VCT solenoids on Bank 2 (the bank near the radiator) and performed an engine oil change. This resolved the P0019 code.
• Reddit user comment from a Ford Technician (2016 F-150 2.7L EcoBoost) — Cold start rattle.
  ❌ Tried (didn't work) Owner was considering if it was a minor issue.
  ✅ What actually fixed it A Ford technician in the thread confirmed the rattle is a classic symptom of cam phaser failure. The rattle is the phaser slamming between advance and retard positions until oil pressure builds. Ignoring it can lead to the phaser's locking pin failing, shearing teeth, or breaking the timing chain, causing catastrophic engine damage. The fix is phaser replacement.
• F150Forum.com user (Ford F-150 (engine not specified)) — Persistent P0019 code after a timing job.
  ❌ Tried (didn't work) Replacing sensors and solenoids did not clear the code.
  ✅ What actually fixed it The cause was found to be a damaged pigtail connector for the camshaft position sensor, which likely occurred during the previous repair. Replacing the connector resolved the code.

OEM Part Supersession History

• BL3Z-6B288-A → BL3Z-6B288-C — Part revision and update by Ford.
  Heads up: This is the Camshaft Position Sensor. The older part number was also known as DU-95. The new part number is the correct replacement.
• AT4Z-6M280-A → AT4Z-6M280-B — Part revision and update by Ford for the 3.7L V6 engine.
  Heads up: This is the VCT Solenoid for the 3.7L V6. Part AT4Z-6M280-B is the common replacement for this engine.
• FT4Z-6M280-A → FT4Z-6M280-B — Part revision and update by Ford for the 2.7L EcoBoost V6 engine.
  Heads up: This VCT Solenoid is specific to the 2.7L EcoBoost. Do not use the part for the 3.7L V6 (AT4Z-6M280-B) on the 2.7L engine, as they are different. Always verify by VIN.

Model Year Variations Within This Range

• 2016-2018: The optional 2.7L EcoBoost V6 has a more complex timing chain procedure than the 3.7L V6. It involves specific 360-degree crank rotations when setting timing for each bank. An incorrect procedure during a timing service is a potential cause for P0019 that doesn't exist on the 3.7L.
• 2017-2018: Some reports indicate that the cam phasers used in the 2017+ 2.7L and 3.5L EcoBoost engines were more prone to failure (cold start rattle) than earlier versions. This may increase the likelihood of a phaser-related cause for P0019 on these later model years.