P0022 on 2007-2015 Mazda CX-9: Intake Camshaft Timing Over-Retarded (Bank 2) Causes and Fixes

What's Unique About the 2007-2015 Mazda CX-9

The 3.5L and 3.7L V6 engines in this generation of the CX-9 (a variant of the Ford Cyclone engine) have a critical design characteristic: the water pump is located inside the engine and is driven by the timing chain. When this water pump fails, it can leak coolant directly into the engine oil. This contamination severely degrades the oil, which is the lifeblood of the VVT system. This can lead to sludged-up components, low oil pressure, and VVT-related codes like P0022, potentially followed by catastrophic engine failure if not addressed. This issue was the subject of a class-action lawsuit against Mazda.

Symptoms You May Notice

• Check Engine Light is on
• Rough idle or engine shaking
• Engine stalling, especially at low speeds or when stopping
• Noticeable loss of power and poor acceleration
• Decreased fuel economy
• Rattling noise from the engine, especially on startup
• Engine noise described by some owners as 'marbles in a can', particularly if related to timing chain/water pump issues

Most Likely Causes

1. Low, Dirty, or Incorrect Viscosity Engine Oil 🔴 High Probability The VVT system is entirely dependent on clean oil at the correct pressure. Neglected oil changes or using the wrong type of oil can easily cause the small passages in the VVT system to clog or operate slowly. Some owners have also reported issues after using low-quality aftermarket oil filters that may restrict flow.
   How to confirm: Check the oil dipstick. Note the level and the condition of the oil. If it's low, dark/sludgy, or looks milky (like coffee with cream), the oil is the problem. A milky appearance is a red flag for water pump failure. A Reddit user with a 2012 CX-9 at 210,000 miles reported that a simple oil change fixed their P0022 code after it had been 8,000 miles since the last one.
   Typical fix: Perform an oil and filter change using a high-quality full synthetic oil of the manufacturer-recommended viscosity (typically 5W-20, check your owner's manual).
   Est. part cost: $40-$80
2. Faulty Bank 2 Intake VVT Solenoid (Oil Control Valve - OCV) 🔴 High Probability These solenoids control oil flow to the cam phasers. They can get clogged with sludge from dirty oil or simply fail electrically over time, causing them to stick. This is a very common failure point across the Ford Cyclone engine family.
   How to confirm: After confirming oil is good, this is the next step. You can test the solenoid's resistance with a multimeter (expect ~6.9-7.9 Ohms at 68°F/20°C). 🎬 See how to test your VVT solenoid with a multimeter. A common diagnostic trick is to swap the Bank 2 intake solenoid with the Bank 1 intake solenoid and see if the code changes to P0012 (the Bank 1 equivalent). If it does, the solenoid is bad.
   Typical fix: Replace the Bank 2 intake VVT solenoid. It is located on the front valve cover and is relatively easy to access. 🎬 Watch: Step-by-step guide to replacing the VVT solenoid. Owners on forums often recommend using the OEM part or a reputable brand like Hitachi, as some aftermarket solenoids have been reported to fail prematurely.
   Est. part cost: $40-$150
3. Failing Internal Water Pump 🟡 Medium Probability This is a well-documented weak point of the Ford 3.5L/3.7L engine family. The pump is internal and chain-driven. When its seals fail, coolant leaks into the oil pan, contaminating the oil and destroying its ability to lubricate. This can throw various timing codes, including P0022, P0012, P0016, and P0018.
   How to confirm: Check the oil for a milky, frothy appearance and an unusually high level on the dipstick. Check the coolant reservoir for signs of oil contamination or unexplained coolant loss. An oil analysis can definitively confirm the presence of coolant. Mazda issued TSB 01-012/13 and 01-007/15 for related platforms, which address coolant mixing with engine oil.
   Typical fix: This is a major and expensive repair that involves removing the timing cover to replace the water pump. While there, it is mandatory to replace the timing chain, tensioners, and guides. This job often costs between $2,000 and $4,000 at a shop.
   Est. part cost: $400-$800
4. Stretched Timing Chain or Failed Tensioner ⚪ Low Probability While the chains themselves are robust, they can stretch over high mileage, especially if run with contaminated or low oil from a failing water pump. The hydraulic tensioners can also lose their ability to keep the chain taut, leading to timing slack.
   How to confirm: Listen for a rattling noise from the front of the engine (timing cover area), especially on cold starts. Confirming this requires removing the valve cover or timing cover to physically inspect chain slack, which is a labor-intensive job. This issue is almost always diagnosed and repaired in conjunction with a water pump failure.
   Typical fix: Replace the timing chain, tensioners, and guides. This is almost always done at the same time as a water pump replacement.
   Est. part cost: $300-$600

Rare But Worth Checking

• Failed Camshaft Phaser: The phaser is the gear on the end of the camshaft that actually does the rotating. It can get stuck due to debris or internal failure, but this is less common than a solenoid failure.
• Clogged Oil Passages: In cases of severe engine sludge, the small oil passages feeding the VVT system can become blocked. This usually indicates a long history of poor maintenance and may require significant engine cleaning or rebuilding.

Diagnosis Steps

1. Check Engine Oil: Pull the dipstick. Is the oil level low? Is the oil dark and sludgy? Most importantly, does it look milky or like chocolate milk? A milky appearance indicates coolant contamination from a likely water pump failure. STOP all other diagnosis if oil is milky; the engine requires major service.
2. Perform an Oil Change: If the oil is simply low or old, perform a full oil and filter change with the correct viscosity full synthetic oil and a quality filter. Clear the code and drive the vehicle to see if it returns.
3. Inspect the VVT Solenoid: If the code comes back, locate the Bank 2 (front) intake VVT solenoid. Check its wiring connector for damage or corrosion.
4. Test or Swap the Solenoid: Test the solenoid's resistance with a multimeter (should be 6.9-7.9 ohms at 68°F/20°C). Alternatively, swap the Bank 2 intake solenoid with the Bank 1 intake solenoid (on the rear valve cover). Clear the codes. If the code returns as P0012 for Bank 1, you've confirmed the solenoid is faulty.
5. Replace the Solenoid: If the solenoid is confirmed bad, replace it. It is recommended to use an OEM or high-quality aftermarket part.
6. Advanced Mechanical Diagnosis: If the oil is clean and a new solenoid does not fix the code, the problem is likely mechanical. Listen for timing chain rattle. At this point, the issue is likely a stretched timing chain, bad phaser, or failing tensioner (often related to water pump failure), and professional service is recommended as it requires significant engine disassembly.

Parts You'll Likely Need

• Intake VVT Solenoid / Oil Control Valve (Bank 2) (OEM #CY01-14-420C (supersedes CY01-14-420A/B)) — This solenoid is a common failure point. It gets clogged with debris from oil and can stick, preventing proper adjustment of the cam timing.
  Trusted brands: Mazda (OEM), Dorman, Hitachi, Standard Motor Products (SMP)
  OEM price range: $90-$150
  Aftermarket price range: $40-$100
• Water Pump & Timing Chain Kit (OEM #CY01-15-010A (Water Pump)) — The internal water pump is a notorious failure point. When it fails, it contaminates the oil with coolant, leading to VVT codes and eventual engine failure. It is always replaced along with the entire timing chain set (chains, guides, tensioners).
  Trusted brands: Mazda (OEM), Gates, Cloyes
  OEM price range: $600-$900 (for full kit)
  Aftermarket price range: $350-$700

Related Codes That Often Appear With This One

• P0012 — 'Intake Camshaft Position Timing - Over-Retarded (Bank 1)'. Seeing both P0012 and P0022 together strongly points to a systemic problem affecting both banks, such as low oil level/pressure, a failing water pump contaminating the oil, or a severely stretched primary timing chain.
• P0021 — 'Intake Camshaft Position Timing - Over-Advanced (Bank 2)'. Seeing opposite codes (over-retarded and over-advanced) can indicate an erratic VVT solenoid or a failing cam phaser that is moving uncontrollably.

Technical Service Bulletins (TSBs) & Recalls

• Mazda TSB 01-012/13: Addresses coolant mixing with engine oil on 3.7L engines.
• Mazda TSB 01-007/15: Addresses coolant in engine oil and/or oil leakage from the timing chain cover due to water pump failure.
• Ford TSB SSM 47170 / 50067: Issued for platform-mates, noting that timing codes like P0022 are often caused by small debris causing the VVT solenoid to stick.

Platform-Specific Known Issues

• The internal timing-chain-driven water pump is the most significant issue for this engine. Its failure leads to coolant mixing with engine oil, which can cause P0022 by destroying the oil's viscosity and sludging the VVT system. This is a catastrophic failure that requires immediate and expensive repairs to avoid destroying the engine.

Mechanic-Grade Diagnostic Values

• VVT Solenoid (OCV) Resistance — expected: 6.9 - 7.9 Ohms at 68°F (20°C). Failure: A reading outside this range, or an open/infinite reading, indicates a failed solenoid coil.
• Engine Oil Pressure — expected: 45 - 90 psi at 2,000 rpm (engine at normal operating temperature). Failure: Pressure significantly below this range indicates a problem with the oil pump, pickup tube, or severe internal leaks/blockages, which would starve the VVT system.
• Scan Tool Live Data: Desired vs. Actual Camshaft Angle (Bank 2 Intake) — expected: The 'Actual' value should closely track the 'Desired' or 'Commanded' value as engine RPM and load change.. Failure: A significant lag where the 'Actual' angle fails to meet the 'Desired' angle indicates the over-retarded condition. A stuck 'Actual' value points to a seized phaser or non-functional solenoid.

Scan Tool Commands That Help

• Mazda IDS (Integrated Diagnostic System) or equivalent advanced scan tool: VVT Solenoid On/Off Test or Active Command — This bidirectional control allows a technician to manually command the solenoid to activate and deactivate. A Ford TSB for the same engine family suggests cycling the solenoid up to 10 times to dislodge small debris that may be causing it to stick, potentially fixing the issue without replacement. If the solenoid clicks audibly and cam angle changes on the data stream, the solenoid is likely functional.
• Mazda IDS (Integrated Diagnostic System): Datalogger / Live Data Display — Used to monitor the desired versus actual camshaft position PIDs in real-time while driving. This is essential to confirm the fault is present and to verify the repair after a fix has been implemented.

Wiring & Ground Locations

• Bank 2 VVT Solenoid Connector — On the front valve cover, closer to the radiator. The solenoid is held in by a single bolt.. This is the primary electrical connector to check for corrosion, damage, or a loose connection when diagnosing P0022. The wiring harness in this area is exposed to heat and vibration.
• Fuse & Relay Box — Located in the center front of the engine compartment.. Contains fuses and relays related to the engine management system, including power supply to the PCM which controls the VVT solenoids. A relevant fuse for the ignition or engine controls could be located here.
• G11 / G13 — G11 is located behind the left side of the dashboard. G13 is located at the left 'C' pillar.. These are major body and chassis ground points. While not directly for the VVT solenoid, a poor ground at one of these locations can cause erratic behavior in the PCM or other control modules, leading to a variety of incorrect codes.

Real Owner Repair Stories

• Reddit user LadyHOTH in r/MazdaCX9 (2012 Mazda CX-9 with 210,000 miles) — Check Engine Light with code P0022.
  ❌ Tried (didn't work) The owner was quoted $2,800 for a list of repairs including an alternator and wheel bearing, and was worried the camshaft issue would persist even after the expensive service.
  ✅ What actually fixed it A simple oil and filter change. The owner noted they were overdue for an oil change by approximately 8,000 miles. The code was resolved and the vehicle ran beautifully afterward.

When the Usual Fixes Don't Work

• In one case documented on the Mazdas247 forum, a user replaced the VVT solenoids (OCVs) which resolved their P0022 code for about a month before it returned. This indicates that while the solenoid is a very common failure point, it is not always the root cause. The user's next diagnostic steps were to investigate low oil pressure or a worn timing chain, highlighting that a recurring code after a solenoid replacement points towards a deeper mechanical or hydraulic issue.

OEM Part Supersession History

• CY01-14-420A, CY01-14-420B → CY01-14-420C — Likely minor internal improvements for reliability or manufacturing process updates.
  Heads up: The parts are interchangeable; the latest revision 'C' should be used for all repairs.

Model Year Variations Within This Range

• 2007 vs 2008-2015: The 2007 model year used a 3.5L V6 engine, while 2008-2015 models used a 3.7L V6. The 3.7L is a larger bore version of the 3.5L. For the purposes of diagnosing P0022, this difference is minor. Both engines are from the same Ford Cyclone family, share the internal timing-chain-driven water pump design, and use the same VVT solenoids (part number CY01-14-420C applies to both).

Diagnostic Flowchart

Used vs. New Parts: Buying Guide for This Vehicle

When a used part is the smart pick: A used VVT solenoid from a reputable auto recycler can be a cost-effective option, especially if it's from a lower-mileage vehicle that was not in a front-end collision. Complete used engines are a very high-risk purchase for this vehicle due to the common internal water pump failure and should only be considered if the service history is known and impeccable.

Donor-vehicle mileage cap: roughly under 80000 miles for the part to have meaningful remaining life.

What to inspect on the donor part:

• For a VVT solenoid, inspect the mesh filter screens for tears, metallic debris, or thick sludge.
• For a complete engine, remove the oil filler cap and look inside with a flashlight for any milky-white or brown sludge, which indicates coolant contamination.
• Check the oil on the dipstick; if it's milky, frothy, or well above the full mark, avoid the engine entirely.

OEM-only on this vehicle (don't cheap out):

• Water Pump
• Timing Chain Tensioners

Aftermarket brands forum-validated for this vehicle:

• Timing Chain Kits: Cloyes, Melling, Gates
• VVT Solenoids: Hitachi, Standard Motor Products (SMP), Beck Arnley

Brands owners have reported issues with on this vehicle:

• Unbranded, 'white-box' VVT solenoids and timing components from online marketplaces have a high failure rate and are not recommended for a repair this labor-intensive.

Real Owner Stories

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

Related OBD-II Codes

• P0012 — Bank 1 equivalent of P0022 ('A' Camshaft Position - Timing Over-Retarded). This code will often appear during diagnosis if a faulty Bank 2 VVT solenoid is swapped with the Bank 1 solenoid. It can also be caused by the same oil contamination issues from a failing water pump.
• P0016 — Crankshaft Position - Camshaft Position Correlation (Bank 1 Sensor A). This code indicates a timing discrepancy that can be triggered by the same root causes as P0022, such as a stretched timing chain or failing tensioner, often resulting from oil contamination due to a bad water pump.
• P0018 — Crankshaft Position - Camshaft Position Correlation (Bank 2 Sensor A). Similar to P0016, this code points to a mechanical timing issue. It is frequently seen alongside other timing codes when the internal water pump fails and causes the timing chain to stretch or skip.

Frequently Asked Questions