P0012 on 2013-2020 Lincoln MKZ: 'A' Camshaft Position Timing Over-Retarded (Bank 1) Causes and Fixes

What's Unique About the 2013-2020 Lincoln MKZ

On these Lincoln engines, the VCT system is highly sensitive to oil quality and pressure. Multiple Technical Service Bulletins (TSBs) confirm that the VCT solenoids are prone to sticking from small debris in the oil, making this a very common issue. For the 3.7L V6 engine, the P0012 code is particularly notable because Bank 1 is the rear cylinder bank against the firewall. Replacing the VCT solenoid on this bank is a significantly more labor-intensive and costly repair because it requires removing the upper intake manifold for access, a job that can take a professional 3-5 hours.

Symptoms You May Notice

• Check Engine Light illuminated
• Rough idle or engine stalling at stops
• Poor acceleration and reduced engine power
• Decreased fuel economy
• Hard starting condition / long crank time
• Rattling noise from the engine, especially on startup (if timing chain is involved)

Most Likely Causes

1. Low, Dirty, or Incorrect Viscosity Engine Oil 🔴 High Probability The VCT system is entirely dependent on clean oil with the correct pressure to function. Sludge or low levels are the number one cause of VCT-related codes on this platform, a fact supported by numerous owner experiences and TSBs.
   How to confirm: Check the oil level on the dipstick. Inspect the oil's color and consistency. If it is dark, below the 'add' line, or past its service interval, this is the likely cause. A simple oil and filter change is the most common and cheapest first step to fixing this code.
   Typical fix: Perform an engine oil and filter change using the manufacturer-specified oil viscosity (e.g., SAE 5W-30 for the 2.0L EcoBoost, SAE 5W-20 for the 3.7L V6). This simple maintenance step resolves the code in many cases.
   Est. part cost: $40-$80
2. Failing Intake VCT Solenoid (Oil Control Valve) 🔴 High Probability → Shop Engine Variable Valve Timing (VVT) Solenoid Multiple TSBs (SSM 47170, 48423, 50067) confirm that these solenoids are prone to sticking due to small debris in the engine oil. This is the most common component failure for this code.
   How to confirm: After confirming oil is good, this is the next step. A bidirectional scan tool can be used to command the solenoid on and off to see if it's responsive. A highly effective DIY method is to swap the intake and exhaust solenoids (if identical) or swap the Bank 1 and Bank 2 intake solenoids (on the V6). If the code follows the part (e.g., changes to P0014 or P0022), the solenoid is confirmed bad.
   Typical fix: Replace the Bank 1 intake VCT solenoid. On the 3.7L V6, this requires removing the intake manifold, so the manifold gaskets should be replaced as well.
   Est. part cost: $30-$90
3. Stretched Timing Chain or Worn Guides/Tensioners ⚪ Low Probability → Shop Engine Timing Chain This is more common on higher-mileage engines (>150k miles) or those with a history of poor oil maintenance. The chain stretch causes a permanent retard in cam timing that the VCT system cannot overcome.
   How to confirm: Listen for a distinct rattling noise from the front of the engine, especially on a cold start, that lasts for 2-5 seconds. A professional diagnosis is needed to measure timing chain slack by removing the timing cover, which is a labor-intensive job.
   Typical fix: Replace the timing chain, tensioners, and guides. This is a major and expensive repair.
   Est. part cost: $400-$1200

Rare But Worth Checking

• Failed Camshaft Phaser: → Shop Engine Camshaft The phaser is the mechanical gear that the VCT solenoid controls. It can get stuck internally or fail, but this is less common than a solenoid failure. A user on a Ford forum reported a bad phaser was the ultimate cause after a solenoid swap didn't work.
• Clogged Oil Passages: In cases of severe engine sludge, the small oil passages leading to the VCT solenoid and cam phaser can become blocked, starving the system of oil pressure. This is often a consequence of severely neglected oil changes.
• Damaged VCT Solenoid Wiring: → Shop Engine Variable Valve Timing (VVT) Solenoid Check the connector and wiring harness for the VCT solenoid for any signs of damage, corrosion, or oil contamination. A Reddit user with a 2.0L EcoBoost experienced a P0010 (circuit code) along with P0012 after finding oil in the connector.

Diagnosis Steps

1. Verify the code with an OBD-II scanner.
2. Check the engine oil level and condition. If low, dirty, or overdue for a change, perform an oil and filter change with the correct viscosity oil. Clear the code and test drive. This is the most critical first step.
3. If the code returns, inspect the wiring and connector for the Bank 1 intake VCT solenoid for any damage, oil saturation, or corrosion.
4. Use a bidirectional scanner to command the Bank 1 intake VCT solenoid on and off. Listen for a clicking sound. TSBs SSM 50067 and others suggest cycling it 10 times to attempt to clear debris before replacement.
5. (3.7L V6) A definitive DIY test is to swap the Bank 1 (rear) intake solenoid with the Bank 2 (front) intake solenoid. Clear codes and drive. If the code changes to P0022, the solenoid is faulty.
6. If the solenoid is confirmed faulty, replace it. For the 3.7L V6, this is a complex job requiring intake manifold removal and new gaskets.
7. If a new solenoid does not fix the issue, the problem is likely more severe. Listen for a startup rattle, which points to a timing chain or phaser issue.
8. At this stage, a professional diagnosis is recommended to check for timing chain stretch or a faulty cam phaser, which may require using an oscilloscope to compare cam and crank signals.

Parts You'll Likely Need

• Intake Variable Camshaft Timing (VCT) Solenoid (OEM #CJ5Z-6M280-A (for 2.0L EcoBoost), 7T4Z-6M280-C (for 3.7L V6)) — This solenoid is the most common part to fail for this code, often due to internal sticking caused by oil debris, as documented in multiple TSBs. Part numbers are confirmed by multiple OEM parts suppliers.
  Trusted brands: Motorcraft, Dorman, Standard Motor Products (SMP), NGK
  OEM price range: $50-$90
  Aftermarket price range: $30-$60
• Upper Intake Manifold Gaskets (OEM #Fel-Pro MS 96895 (Aftermarket example)) — Required for the 3.7L V6 engine when replacing the Bank 1 (rear) VCT solenoid, as the intake manifold must be removed for access. It is critical to replace these to prevent vacuum leaks.
  Trusted brands: Motorcraft, Fel-Pro, Mahle
  OEM price range: $40-$70
  Aftermarket price range: $20-$40

Related Codes That Often Appear With This One

• P0022 — This is the same over-retarded code for Bank 2 (front bank on the 3.7L V6). Seeing both P0012 and P0022 together strongly suggests a systemic issue like low/dirty oil or low oil pressure affecting the entire engine.
• P0011 — This is for an over-advanced condition on the same camshaft. Seeing opposite codes can indicate a very erratic VCT solenoid that is sticking intermittently or a more complex internal engine problem.
• P0016 — This code indicates a correlation problem between the crankshaft and camshaft. It can appear with P0012 if the timing chain has stretched or jumped a tooth, as it signifies a more fundamental timing misalignment.

Technical Service Bulletins (TSBs) & Recalls

• SSM 47170 / 48423 / 49821 / 50067 / 54366: A series of related TSBs for 2015-2021 Ford/Lincoln vehicles noting that various VCT codes (including P0012) may be caused by small debris causing the VCT solenoid to stick. TSB 50067 specifically advises using pinpoint test HK12 to cycle the solenoid 10 times to attempt to clear debris before replacement.

Platform-Specific Known Issues

• On the 3.7L V6, accessing the Bank 1 VCT solenoids is a major job that requires removing the upper intake manifold, significantly increasing labor costs compared to the easily accessible Bank 2 solenoids. Forum users confirm this is a 3-5 hour job for a professional.
• TSBs SSM 47170, 48423, and 50067 specifically mention that debris in the oil can cause the VCT solenoids to stick, and recommend attempting to cycle the solenoid with a scan tool (Pinpoint Test HK12) to clear it before authorizing a replacement.

Mechanic-Grade Diagnostic Values

• VCT Solenoid Coil Resistance (2.0L EcoBoost & 3.7L V6) — expected: 6.9 to 15 Ohms. A common range cited is 6.9-7.9 Ohms for some Ford applications, while others state a broader 5-15 Ohms.. Failure: A reading of infinity (open circuit) or near zero (short circuit) indicates a failed solenoid coil.
• VCT Solenoid Connector Voltage (Key On, Engine Off) — expected: Approximately 12V (battery voltage) at the power supply pin in the connector.. Failure: No voltage suggests a problem with the wiring harness or the PCM power supply circuit.
• Engine Oil Pressure (3.7L V6 / similar Ford V8) — expected: Approximately 15-20 PSI at hot idle.. Failure: Significantly lower pressure at idle (e.g., below 15 PSI) can indicate a widespread lubrication problem (worn pump, internal leaks) that would starve the VCT system and cause P0012.

Hidden / Shadow Codes Worth Checking

• Mode 6, Test ID $53 (or $A2-$AF on newer models): This is not a separate code but a function within a generic OBD-II scanner. It displays raw misfire count data for each cylinder before the count is high enough to set a specific P030x code. While P0012 is a timing code, the resulting rough running can cause misfires. Checking Mode 6 can help determine if the timing issue is causing misfires across all cylinders or just on Bank 1. (see via Use a scan tool that supports Generic Functions / Mode 6. The specific Test ID for misfires varies by Ford model and year.)

Scan Tool Commands That Help

• Ford IDS (Integrated Diagnostic System) or equivalent bidirectional scanner: Pinpoint Test HK11 or HK12: VCT Solenoid Cycle — As recommended by Ford TSBs (like SSM 48423), this command should be used after checking oil but before replacing the solenoid. It cycles the solenoid on and off 10 times to attempt to dislodge small debris that may be causing it to stick. If the engine sound changes or the code clears temporarily, it points to a sticking solenoid.
• Ford IDS (or equivalent): Live Data PID: VCT_ADV_ERR (Cam Advance Error) — This PID shows the difference between the commanded camshaft angle and the actual camshaft angle in real-time. For a P0012, you would expect to see a persistent negative value, indicating the cam is lagging (retarded) behind the command. This confirms the PCM is seeing the fault.

Wiring & Ground Locations

• Main Engine Ground — On the passenger side of the engine, attached to one of the motor mount bolts.. A poor main engine ground can cause a host of erratic electrical issues. While not a direct cause of a hydraulic/mechanical fault like P0012, it can affect sensor readings and PCM operation, potentially leading to misdiagnosis. Ensuring all engine grounds are clean and tight is a foundational step.
• G103 / Cowl Ground — Located at the left rear of the engine compartment on the cowl, above the brake booster.. This ground point serves multiple critical components, including the Engine Control Module (ECM/PCM) and the Data Link Connector (DLC). A fault here could disrupt PCM function and its ability to control or accurately read the VCT system.
• VCT Solenoid Connector — Plugged directly into the top of the VCT solenoid, which is located on the valve cover. For the 3.7L V6, the Bank 1 solenoids are on the rear valve cover against the firewall.. This is the connection point for testing voltage and resistance of the solenoid circuit. It is also a common place for oil to leak into, causing poor connections and circuit-related fault codes that can accompany P0012.

Real Owner Repair Stories

• f150forum.com user 'dlrichmond' (2016 Ford F-150 5.0L V8 (similar VCT system) at 194,000 miles) — Surging/bucking under acceleration, sputtering/stalling at stops, pending P0012 code, random misfires on all cylinders, and low oil pressure (15 psi at 1000 RPM).
  ❌ Tried (didn't work) An initial oil change to full synthetic and replacement of coil packs/spark plugs provided a temporary improvement but the issue returned.
  ✅ What actually fixed it A full timing job was required. The VCT solenoids, timing chain, phasers, and tensioners were all replaced. This completely resolved the P0012 code and all associated drivability issues.
• s197forum.com user (cited in a diagnostic article) (Ford Mustang (S197 generation, similar VCT system)) — P0012 code present.
  ❌ Tried (didn't work) Initial diagnosis was uncertain between the cam sensor, phaser, or timing components.
  ✅ What actually fixed it The owner swapped the VCT solenoids between Bank 1 and Bank 2. The code changed to P0022, following the solenoid. Replacing the confirmed-bad VCT solenoid resolved the issue.

"I Checked Everything" — The Actual Cause

• In the context of P0012, the equivalent scenario is when an oil change and VCT solenoid replacement fail to resolve the code. In these cases, the root cause is almost always a deeper mechanical or hydraulic issue. One forum user with a high-mileage engine ultimately needed a full timing chain and phaser replacement to fix a persistent P0012, even after trying the common, simpler fixes. This indicates the mechanical slack in the timing system was too great for the VCT system to overcome, or oil flow was restricted upstream of the solenoid.

OEM Part Supersession History

• 7T4Z-6M280-A, 7T4Z-6M280-AA, 7T4Z-6M280-B → 7T4Z-6M280-C — Part revision and consolidation for the VCT solenoid used on the 3.7L V6 engine. Later revisions often address reliability issues found in earlier designs.
  Heads up: Some aftermarket listings for the 3.7L V6 note a 'Gray Connector' for the intake left/exhaust right solenoid. While the OEM part is generally interchangeable between intake/exhaust on the same bank, it's critical to ensure the replacement part matches the specific application.
• CJ5Z-6M280-A → CJ5Z-6M280-B (mentioned in some sources) — Standard part revision for the 2.0L EcoBoost solenoid.

Model Year Variations Within This Range

• 2017-2020: The 2017 model year introduced a facelift for the MKZ. While the 2.0L EcoBoost and 3.7L V6 powertrains were largely carried over from 2013-2016, a new 3.0L EcoBoost V6 became available. The fundamental causes and diagnostic procedures for P0012 on the 2.0L and 3.7L engines remained the same across the entire 2013-2020 generation.

Diagnostic Flowchart

Real Owner Stories

Aggregated from forums and TSBs cited above. Mileages and costs reflect what owners reported in those sources.

Related OBD-II Codes

• P0014 — Exhaust Camshaft Position Timing - Over-Advanced (Bank 1). This code may appear during diagnosis if you swap a faulty intake VCT solenoid with an exhaust VCT solenoid to test for component failure.
• P0022 — Intake Camshaft Position Timing - Over-Retarded (Bank 2). This is the Bank 2 equivalent of P0012. On the 3.7L V6, swapping a faulty Bank 1 solenoid to the Bank 2 position will cause the P0012 code to change to P0022, confirming a bad solenoid.
• P0301 — Cylinder 1 Misfire Detected. On the 2.0L EcoBoost, this code can appear alongside P0012 and P0217 if the engine is suffering from coolant intrusion due to a cracked block (TSB 19-2346).
• P0217 — Engine Coolant Overtemperature Condition. This code has been reported alongside P0012 on 2.0L EcoBoost models experiencing severe coolant intrusion and cracked engine blocks (TSB 19-2346).

Frequently Asked Questions