The P1380 fault typically points to a problem in the Variable Valve Timing (VVT) control circuit on Bank 2. We usually see this on vehicles where the oil hasn’t been changed on time, or when the VVT solenoid starts sticking due to sludge. In some cases, wiring and connectors are the real culprit.
Below is a technician-style breakdown of symptoms, causes, and the steps we use in the shop to confirm the repair.
Common Symptoms
- Rough idle, especially during cold start
- Noticeable lack of power under acceleration
- Poor fuel economy
- Delayed or inconsistent cam timing advance
- Check Engine Light with P1380 stored
Most Likely Causes
- Low or dirty engine oil causing VVT solenoid restriction
- Faulty VVT control solenoid (Bank 2)
- Oil control passage clogged by sludge
- Wiring/connector corrosion at VVT solenoid
- PCM not commanding proper VVT voltage (rare, but possible)
How a Technician Diagnoses P1380
Here is the same process we typically follow in the workshop:
1. Check Oil Level & Condition
Low oil or thick, overdue oil is the #1 trigger for P1380. If the oil is dark and sludged, it can restrict the VVT oil passages on Bank 2.
2. Command the VVT Solenoid Using a Bidirectional Scanner
With a full-system tool like the iCarsoft CR ULTRA P , we activate the Bank 2 VVT solenoid and check whether:
- The solenoid responds correctly
- The cam angle changes during command
- There is a delay or no movement
3. Inspect Wiring at the Solenoid
Broken insulation or corrosion is common near the valve cover. A quick tug test usually reveals weak wires.
4. Remove & Bench-Test the Solenoid (If Needed)
If the solenoid is sticking, we either replace it or clean the oil screen if the design allows it.
Quick Fixes That Work in Most Cases
- Change the engine oil + filter (use correct viscosity)
- Clean sludge buildup in VVT passage (if accessible)
- Replace the Bank 2 VVT solenoid
- Repair damaged wiring or loose connectors
Recommended Tool for P1380 Diagnosis
The iCarsoft CR ULTRA P gives you full access to VVT data, cam angle, oil pressure readings, and bi-directional solenoid testing. This is exactly the type of scanner we use to confirm a bad VVT solenoid vs. wiring or oil pressure issues.
FAQ
Is it safe to keep driving with P1380?
Usually the engine will still run, but prolonged driving with incorrect cam timing can cause increased wear and poor fuel efficiency. We recommend diagnosing it sooner rather than later.
Does bad oil really cause P1380?
Yes — more often than people expect. VVT relies heavily on clean oil. Even one skipped oil change can stick the solenoid or clog the oil control passage.
Is Bank 2 always the passenger side?
Not always. Bank 2 is the side of the engine that does *not* have cylinder 1. Check your service manual.
How do I confirm the solenoid is bad?
Use a bi-directional tool to command it on/off. If the cam angle doesn’t change, the solenoid is usually the problem.
