P0015 on 2015-2019 Ford Explorer Police Intercept: Exhaust Cam Timing Causes and Fixes

What's Unique About the 2015-2019 Ford EXPLORER POLICE INTERCEPT

For this generation of Explorer and other Ford vehicles, the manufacturer has issued a Technical Service Bulletin (TSB SSM 50067) acknowledging that P0015 and other related codes can be caused by small debris in the engine oil, which causes the Variable Camshaft Timing (VCT) solenoid to stick. This makes a sticking solenoid a very high-probability cause on this specific vehicle. The Police Interceptor Utility's duty cycle often involves extended periods of idling, which can accelerate oil breakdown and sludge formation, increasing the likelihood of VCT system faults. Both the standard 3.7L Ti-VCT V6 and the optional 3.5L EcoBoost V6 use this VCT system and are susceptible.

Diagnostic Flowchart

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

Symptoms You May Notice

• Check Engine Light is on.
• Rough, uneven idle.
• Reduced engine power and sluggish acceleration.
• Engine may hesitate or stall, especially at low RPM.
• Decreased fuel economy.
• Rattling, knocking, or chain-slapping noise from the engine, especially during a cold start.

Most Likely Causes

1. Low or Dirty Engine Oil 🔴 High Probability The VCT system is hydraulic and highly sensitive to oil pressure and cleanliness. Sludge or low oil levels can prevent the VCT solenoids and phasers from operating correctly. Police Interceptor duty cycles with high idle time can degrade oil faster.
   How to confirm: Check the engine oil dipstick for level and condition. If the oil is below the 'add' mark or appears dark, gritty, or sludgy, this is the likely starting point. An oil change is the first recommended step for any VCT-related code.
   Typical fix: Perform an engine oil and filter change using the correct Motorcraft-specified oil viscosity (e.g., 5W-20 or 5W-30 synthetic blend) and a quality filter like the Motorcraft FL-500S.
   Est. part cost: $40-$80
2. Failing VCT Oil Control Solenoid 🔴 High Probability → Shop Engine Camshaft Ford TSB SSM 50067 directly states that small debris can cause the VCT solenoid to stick, leading to this code. It's a very common failure point on these engines. Another TSB (16-0093) notes this can occur even on low-mileage (under 2,000 miles) vehicles.
   How to confirm: A mechanic can use a scan tool to run Ford's Pinpoint Test HK12, which cycles the solenoid 10 times to try and dislodge debris. Resistance can be tested with a multimeter and should be between 5 and 14 ohms. A common DIY method is to swap the exhaust solenoid with the intake solenoid on the same bank (if they are identical parts) and see if the code changes to P0012 (Intake Over-Retarded).
   Typical fix: Replace the Bank 1 exhaust VCT solenoid. On the 3.7L and 3.5L engines, the Bank 1 (firewall side) solenoids are under the valve cover, which requires removing the upper intake manifold and valve cover, making it a labor-intensive job. 🎬 Watch: Step-by-step guide to replacing the exhaust VCT solenoid. It is recommended to replace the valve cover gasket (e.g., DL3Z-6584-C for the right/firewall side) and spark plug tube seals at the same time.
   Est. part cost: $30-$90
3. Stretched Timing Chain or Worn Guides/Tensioners ⚪ Low Probability → Shop Engine Timing Chain This is a mechanical wear issue that becomes more probable on higher-mileage vehicles (over 100,000 miles) or those with a history of infrequent oil changes. The 3.5L EcoBoost, in particular, is known for timing chain stretch.
   How to confirm: A distinct rattling or slapping noise from the front of the engine upon startup that lasts for a few seconds is a strong indicator. Professional diagnosis is required, as it involves inspecting the timing components directly, which requires significant engine disassembly.
   Typical fix: Replace the timing chain, tensioners, guides, and often the cam phasers as a complete kit (e.g., Ford kit BL3Z-6D256-C for the 3.5L EcoBoost). This is a complex and expensive repair.
   Est. part cost: $400-$1200

Rare But Worth Checking

• Worn Camshaft Phaser: → Shop Engine Camshaft The phaser is the gear on the end of the camshaft that actually adjusts the timing. It can get stuck or clogged with debris, but this is less common than a solenoid failure. On the 3.5L EcoBoost, a failing phaser is often the source of the 'cold start rattle'.
• Wiring or Connector Issue: Damage to the wiring or a corroded connector for the VCT solenoid can cause an open or shorted circuit, preventing it from functioning. This is worth inspecting before removing the valve cover.
• Faulty Camshaft Position Sensor: → Shop Engine Camshaft Position Sensor While possible, a failing camshaft position sensor will typically throw its own specific diagnostic code (e.g., P0345 or P0349). It is an uncommon cause for P0015 alone.

Diagnosis Steps

1. Check engine oil level and condition. If low or dirty, perform an oil and filter change using the manufacturer-specified oil and filter, clear the code, and re-test.
2. Use an OBD-II scanner to confirm P0015 and look for other related codes (e.g., P0014, P0017, P0025).
3. Inspect the wiring and connector for the Bank 1 exhaust VCT solenoid for damage or corrosion. The connector is on the firewall side of the engine.
🎬 See this video to correctly identify Bank 1 vs Bank 2.
4. Using a capable scan tool, monitor the commanded vs. actual camshaft position PIDs for Bank 1 exhaust (B1E). Observe for lagging response.
5. Attempt to cycle the VCT solenoid using the scan tool's bidirectional controls as recommended by Ford TSB SSM 50067 (Pinpoint Test HK12) to dislodge any debris.
6. If the solenoid is unresponsive or the problem persists, test its resistance with a multimeter. Disconnect the solenoid and measure across its two pins. A reading between 5-14 ohms is expected.
7. If the solenoid and wiring test good, the next step is to suspect a mechanical issue like a stretched timing chain or faulty phaser. Listen carefully for a startup rattle. This level of diagnosis typically requires a professional.

Parts You'll Likely Need

• Engine Variable Valve Timing (VCT) Solenoid (OEM #AT4Z-6M280-A (Black connector, often for exhaust)) — This is the most common cause of P0015 on this vehicle, as noted in manufacturer TSBs. It gets stuck from oil debris. Note that part numbers can vary; TSB 16-0093 also lists AT4Z-6M280-C for the right side exhaust. Always verify with VIN.
  Trusted brands: Motorcraft, SKP, Dorman
  OEM price range: $50-$100
  Aftermarket price range: $30-$70
• Engine Oil and Filter (OEM #Motorcraft FL-500S (Filter)) — Correct oil level and cleanliness are critical for the VCT system to function. This is the first and most important diagnostic and maintenance step.
  Trusted brands: Motorcraft Synthetic Blend 5W-20/5W-30, Mobil 1, Valvoline
  OEM price range: $40-$80
  Aftermarket price range: $35-$65
• Valve Cover Gasket (Bank 1 / Right Side) (OEM #DL3Z-6584-C) — Required when replacing the VCT solenoid on the 3.5L/3.7L engines, as the solenoid is located under the valve cover. It is essential to replace the gasket to prevent oil leaks after the repair.
  Trusted brands: Motorcraft, Fel-Pro
  OEM price range: $20-$40
  Aftermarket price range: $15-$30

Related Codes That Often Appear With This One

• P0014 — This indicates an over-advanced condition on the same camshaft, suggesting an erratic VCT system or a solenoid that is sticking intermittently in both directions.
• P0017 — This is a Camshaft/Crankshaft correlation code for the same bank and camshaft (Bank 1 Exhaust). It indicates a more significant timing misalignment that the PCM has verified against the crankshaft position, often pointing towards a stretched timing chain or jumped tooth.
🎬 Watch: How to diagnose timing chain stretch and related codes.
• P0025 — This is the same over-retarded code but for Bank 2 (front of the engine). Seeing both P0015 and P0025 together strongly points towards a global issue like low oil pressure, severe oil contamination, or a failing oil pump, rather than a single component failure.

Technical Service Bulletins (TSBs) & Recalls

• SSM 50067: Notes that various VCT codes, including P0015, may be set due to small debris causing the VCT solenoid to stick. Recommends a diagnostic procedure (Pinpoint Test HK12) to cycle the solenoid before replacement.
• TSB 16-0093: Pertains to low-mileage 2016 vehicles with 3.5L engines exhibiting VCT codes (including P0015) and advises replacing the affected solenoid directly.

Platform-Specific Known Issues

• TSB SSM 50067 notes that on 2015-2021 Ford vehicles, DTCs like P0015 may be caused by small debris causing the VCT solenoid to stick. The bulletin advises attempting to clear the debris by cycling the solenoid with a scan tool before replacing it.
• TSB 16-0093 was issued for some 2016 models with 3.5L engines that exhibit VCT codes at very low mileage (under 2000 miles), recommending direct replacement of the affected solenoid.
• The location of the Bank 1 solenoids on the firewall side of the engine makes replacement significantly more difficult and costly than Bank 2, as the upper intake manifold must be removed for access.

Mechanic-Grade Diagnostic Values

• VCT Solenoid Internal Resistance — expected: 5 to 15 Ohms. More specific ranges cited are 6.9-7.9 Ohms or 10-12 Ohms for OEM parts.. Failure: A reading of 0 (short circuit), infinity (open circuit), or a value significantly outside the expected range indicates a failed solenoid.
• VCT Solenoid Voltage Supply (Key On, Engine Off) — expected: Battery Voltage (approximately 12V) at the power supply pin of the solenoid connector.. Failure: No voltage or low voltage suggests a wiring issue, a blown fuse, or a problem with the PCM power supply.
• Scan Tool PID: VCT_EXH_ERR1 (Bank 1 Exhaust Camshaft Timing Error) — expected: Should be close to 0 degrees at warm idle.. Failure: A consistent, large value (e.g., more than +/- 5 degrees) while the PCM is commanding a change indicates the camshaft is not reaching its target position, pointing to a solenoid, phaser, or oil flow problem.
• Scan Tool PID: VCT Solenoid Duty Cycle — expected: The PCM increases the duty cycle to command more camshaft retard.. Failure: If the PCM commands a high duty cycle but the VCT_EXH_ERR1 PID does not change accordingly, it suggests the solenoid is stuck or there is a hydraulic blockage.

Hidden / Shadow Codes Worth Checking

• Mode $06, TID $53: This is not a shadow code, but a diagnostic mode that can reveal cylinder-specific misfire data before a P030x code is set. While not directly for P0015, it can help identify if the timing issue is causing misfires on Bank 1 cylinders. (see via A scan tool that supports Mode $06 data. On newer Fords, the test IDs may be labeled more descriptively (e.g., 'Misfire Cylinder 1 Data').)

Scan Tool Commands That Help

• Ford IDS (Integrated Diagnostic System) or FORScan: VCT Solenoid Bidirectional Control / Output State Control — This command allows a technician to manually cycle the VCT solenoid on and off with the engine running at idle. As noted in TSB SSM 50067, this can sometimes dislodge small debris causing the solenoid to stick. If cycling the solenoid causes a noticeable change in idle quality, it confirms the solenoid is capable of actuating. If there's no change, the solenoid is likely stuck or has failed electrically.

Wiring & Ground Locations

• Bank 1 VCT Solenoid Connector — On the 3.5L/3.7L V6, the Bank 1 (firewall side) VCT solenoids are located under the valve cover. The electrical connectors are accessible at the top edge of the valve cover before disassembly.. This is the primary connection point for testing solenoid resistance and voltage supply. Oil leaking from the valve cover can contaminate these connectors, causing intermittent faults.
• Engine Ground Strap — A primary ground strap connects from the firewall to a stud on the rear of the cylinder head (Bank 1 side on the Explorer).. A corroded or loose ground strap can cause erratic behavior in engine sensors, including the camshaft position sensor, potentially leading to incorrect timing readings by the PCM. While not a direct cause of P0015, ensuring this ground is clean and tight is a crucial step in diagnosing any electronic engine fault.

Real Owner Repair Stories

• YouTube user 'Project Lifestyle' (2015 Ford F-150 3.5L EcoBoost with 70,000 miles) — Rough idle, strong fuel smell, Check Engine Light with codes P0015, P0017, and P054B.
  ❌ Tried (didn't work) A dealership immediately diagnosed the issue as needing cam phaser replacement without further testing., Replacing the Bank 1 exhaust camshaft position sensor did not fix the issue.
  ✅ What actually fixed it The owner tested the VCT solenoids and found the Bank 1 exhaust solenoid was faulty. After replacing both the intake and exhaust VCT solenoids on Bank 1, all codes were resolved and the rough idle was fixed. The final cause was a bad solenoid, not the cam phasers as initially diagnosed by the dealer.

When the Usual Fixes Don't Work

• In one documented case involving a 2015 F-150 with the 3.5L EcoBoost engine, the owner received codes P0015 and P0017 and was told by a dealership that the cam phasers needed to be replaced at a high cost. The owner instead diagnosed the issue himself and found a faulty VCT solenoid. Replacing the solenoid completely resolved the problem, indicating that even when correlation codes like P0017 are present, the root cause can still be a relatively inexpensive solenoid rather than a major mechanical timing failure.

OEM Part Supersession History

• AT4Z-6M280-A → AT4Z-6M280-A (current) — This part number appears to be used for multiple positions and has related part numbers for specific locations. TSB 16-0038 specifies different solenoids for intake vs. exhaust on some models.
  Heads up: For the 3.5L/3.7L engines, there can be confusion. TSB 16-0038 notes that for a P0015/P0017 combination, the Bank 1 exhaust VCT solenoid should be replaced. This is often part number AT4Z-6M280-C, while AT4Z-6M280-A may be for the intake. It is critical to verify the correct part for the specific position (intake/exhaust) and bank via VIN, as they are not always interchangeable despite looking identical.