Can you keep driving?
Can you keep driving?
Stop driving if any of these apply
- !The vehicle suddenly runs much worse, loses power sharply, or the check-engine light starts flashing.
- !There is a strong smell, smoke, overheating, or any symptom that suggests a real-time safety problem rather than a stored code alone.
What to check first
Step-by-step checks
- 1
Safety first
Let the engine cool before touching turbo, exhaust, or charge-air parts
- 2
Free - no tools
Inspect the connector for looseness, corrosion, or spread terminals
- 3
Basic tool needed
Check whether the boost system stays in one position instead of switching under load
- 4
Basic tool needed
If scan data is available, compare commanded boost changes with the solenoid response
- 5
Basic tool needed
Look for recent repairs that may have left the control connector partly unplugged or the harness strained
- 6
Basic tool needed
Verify fuse and power feed condition if the circuit is not being driven correctly
If the code returns
- -If the signal is open, repair the connector or harness before replacing the solenoid.
- -If the solenoid still fails after power and ground are restored, replacement is more likely.
- -If the boost response is also inconsistent, check the wastegate and vacuum side too.
Background
What this code means
P0246 is a generic OBD-II code for a high-input boost control solenoid circuit.
That usually means the ECU is seeing an open circuit or a signal that is higher than expected. The circuit may be broken, the connector may be loose, or the solenoid may no longer be responding in a believable way.
Diagnosis
Common causes
Open circuit in the solenoid wiring
A broken wire or loose terminal can make the ECU see a very high value.
Failed boost control solenoid
The valve may not be switching at all or may be stuck open electrically.
Loose connector or terminal fit
Poor contact can create a signal that looks too high or absent.
Vacuum side not responding
A mechanical control failure can look like an electrical one if the system never changes state.
Avoid these mistakes
What not to do
- xDo not replace the turbo first if the electrical circuit is open.
- xDo not ignore a connector that is barely clipped in.
Parts
Parts that may need replacing
See also
Related OBD codes
Source notes
Generic OBD-II (SAE J1979 / ISO 15031-5). P0246 was seeded from dtcdb and then expanded around high boost control solenoid circuit faults, especially open circuits and connector problems.
This guide is written as a generic multi-make reference, so bulletin history, sensor locations, and repair order can still change by manufacturer and engine family.
This is generic OBD-II guidance and should not override vehicle-specific service information. Exact diagnosis and repair steps vary by make, engine family, and model year.
Last reviewed: 2026-04-10
Reference: Open reference