The P0020 code signifies an issue with the “A” Camshaft Position Actuator Circuit (Bank 2), which is part of the engine’s Variable Valve Timing (VVT) system. This system adjusts the timing of the camshaft to improve engine performance, fuel efficiency, and emissions.
P0020 quick overview
| Meaning | P0020 – “A” Camshaft Position Actuator Circuit (Bank 2) |
| Is it serious? | Yes, it can lead to engine performance issues, increased emissions, and potentially more severe engine damage. |
| Possible causes | – Faulty camshaft position actuator solenoid – Poor electrical connections or wiring issues – Insufficient oil pressure or overdue oil changes – Mechanical timing issues |
| How to diagnose? | Inspect the VVT system for proper operation and mechanical issues. Check electrical connections to the solenoid for corrosion or looseness. Evaluate engine oil condition and pressure to ensure proper VVT operation. Perform voltage-drop testing on the circuit to ensure it can carry the necessary load. Swap solenoids between banks to test for internal PCM issues. |
P0020 Meaning
The P0020 code is a critical indicator that there may be a malfunction within the engine’s VVT system, specifically affecting the actuator circuit for the camshaft on Bank 2.
This malfunction can stem from electrical issues such as poor wiring connections, mechanical faults like timing inaccuracies, or insufficient oil pressure affecting the actuator’s ability to adjust cam timing accurately. Addressing these issues promptly is crucial to maintaining engine performance and preventing potential damage.
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How to fix P0020 – learn from mechanics
I looked into P0020 service cases at iatn.com website where in the private forums the mechanics seek advice from other mechanics. I looked up a bunch of cases to help you decide how to fix your issue and see what would a real mechanic do to solve it.
Case #1: Ford P0020
Vehicle information 2009 Ford Fusion SEL 3.0L
Issue + repair history
- Vehicle resets code P0020 every 2nd ignition cycle
- Followed Ford’s pinpoint test with no success, no open circuits found
- Checked continuity from PCM to solenoid and fuse box to solenoid, both showed good
- Manually activated solenoid and observed normal activation, but noted poor engine maintenance with 21k overdue on oil change
- Cam signals between banks slightly off but not significantly
Related Repair History
- Attempted Ford’s pinpoint test, but unable to resolve P0020 code
- Inspected PCM wiring and solenoid functionality, no issues found
- Noted poor engine maintenance as potential contributor to VVT system malfunction
Mechanic suggestions
- Consider the impact of poor engine maintenance on VVT system operation
- Check for electrical interference, alternator ripple, or other external factors affecting sensor readings
- Evaluate cam timing and engine condition due to lack of oil changes
- Assess circuit integrity by performing voltage-drop testing and load testing to ensure the ability to carry a load
- Consider swapping solenoids between banks to identify potential internal PCM issues
- Monitor engine note changes when manually activating solenoid to gauge system response
Final fix
- Discovered poor contact in solenoid connector terminals, leading to intermittent voltage drop and triggering of P0020 code
- Tightened connector terminals to improve contact and resolve voltage drop issue
- No further codes observed, customer satisfied with repair
Case #2: Toyota P0020
Vehicle information 2011 Toyota Sienna LE 3.5L
Issue + repair history
- Engine tuned, coolant hoses replaced, and flush performed without incident
- Upon turning the key, DTCs P0010, P0020, P0013, and P0023 along with VSC light illuminate
- DTCs can be cleared but immediately return
- All four solenoids checked and found to be functional with proper activation
- Suspected low voltage issue due to initial engine tuneup
Related Repair History
- Recent engine tuneup and coolant hose replacement performed without complications
- Harness disconnected during repairs, inspected for issues but none found initially
Mechanic suggestions
- Check for crossed plugs during reconnection after tuneup
- Investigate potential issues with ground circuits or computer driver circuitry
- Verify correct assembly and connection of wiring harnesses, ensuring snug fit of connectors
- Inspect ECM grounds and ensure all are securely connected
- Consider possibility of water exposure during coolant flush affecting connectors
- Look for loose or misplaced grounds behind the plenum if removed during repair
- Examine connectors for coolant migration, particularly if hoses were recently replaced
- Ensure all PCM grounds are properly connected, including those at the back of the engine
- Verify ECM software compatibility with the vehicle and consider reflash if necessary
Final fix
- Discovered a ground circuit that was only hand tightened and overlooked during initial inspection
- Tightened the ground circuit connection, resolving the issue and preventing immediate recurrence of DTCs
- No further codes observed, confirming successful repair
Case #3: Ford P0020
Vehicle information 1997 Ford F-150 4.6L
Issue + repair history
- Service engine soon light comes on intermittently, accompanied by reduced power mode
- Sets code P0020
- Oil light comes on, and coolant drips from overflow bottle
- Engine runs at normal temperature, coolant bottle shows no signs of boiling over
- Restarting the engine restores normal power and turns off the oil light
- Replaced intake camshaft position sensor (bank 2), but issue recurred after one week
Related Repair History
- Replaced intake camshaft position sensor (bank 2)
Mechanic suggestions
- Check oil pressure and inspect reluctor that the sensor sees
- Investigate the possibility of a seeping head gasket causing coolant loss, leading to power loss and fouled spark plugs
- Monitor for residue on spark plugs that washes away with warm water, indicating coolant leakage
- Verify oil pressure specifications for this engine at hot conditions and consider an oil change with verified viscosity for a high mileage engine
Final fix
- After further testing and driving, found that the temperature gauge jumped into the red during the loss of power event
- Block test performed, indicating blown head gaskets
How to diagnose P0020
I made you an overview of solving this DTC, based on all the advice that was suggested by certified mechanics to address this issue in previously mentioned service cases.
| Diagnostic Step | Explanation |
|---|---|
| Inspect VVT system and solenoid | Check for mechanical wear, electrical faults, and proper operation. |
| Check electrical connections | Look for loose, corroded, or damaged connectors and wiring. |
| Evaluate engine oil condition and pressure | Ensure oil is clean, at the correct level, and pressure is within specifications. |
| Perform voltage-drop and load testing | Confirm the integrity of the circuit and its capacity to handle electrical loads. |
| Swap solenoids between banks | Diagnose potential PCM issues or further isolate the fault. |
Car Diagnostics Training
- Car Electrical basics
- OBD-II scanner basics
- How to use an OBD reader
- Introduction to a Bi-directional Scan tool
- OBD scanner buyer’s guide + discounts
I test OBD-II scanners and make DIY Engine diagnostics guides to help you solve your car problems without having to depend on the mechanic. A lot of them will try to scam you or are just no help at all. About Juraj Lukacko