Intake Valve Control Solenoid Circuit High Bank 1
What it means
P0077 means the engine control module sees higher-than-expected voltage on the bank 1 intake valve (variable valve timing) control solenoid circuit — usually an open circuit or a short to power in the wiring or the solenoid itself. The intake cam timing may be stuck, causing rough running and some loss of power and fuel economy.
Can I keep driving? Drivable, but expect rough running and reduced power; it won't fix itself, so get the solenoid circuit checked.
Real-world scan data
Appears alongside · share of P0077 scans
Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.
Common symptoms
What you'll notice
- Check-engine light on
- Rough idle
- Reduced power or acceleration
- Reduced fuel economy
Common causes
Most likely first
- Open circuit or short to power in the wiring/connector (most likely for a High code)Likely
- Failed intake valve control solenoid coilCommon
- Corroded or loose connector at the solenoidCommon
- Failed ECM driver (rare)Less often
How to diagnose & fix
Work through it in order
- Scan and record freeze-frame data.
- Inspect the solenoid connector and wiring for an open or a short to power.
- Measure the solenoid's resistance against spec.
- Confirm the solenoid's power and ground.
- Replace the solenoid if it's out of spec; consider the ECM last. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P0077?+
Can I just clear P0077?+
Related codes
Read & clear P0077 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.