P0077
Intake Valve Control Solenoid Circuit High Bank 1
Variable valve timing
Generic OBD-II
High
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.
High
Can I keep driving? Drivable, but expect rough running and reduced power; it won't fix itself, so get the solenoid circuit checked.
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?+
Short-term yes. The intake cam timing on bank 1 may be stuck, so expect rougher running and less power, but there's no immediate mechanical danger.
Can I just clear P0077?+
It returns until the circuit fault is fixed. This is a High code, so look for an open or short to power on the solenoid's control wire.
Related codes
Often seen with P0077
Read & clear P0077 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX