Turbo Charger Bypass Valve Control Circuit High
Code P0035 means the turbocharger/supercharger bypass valve control circuit voltage is high — the circuit reads above the expected range. This typically indicates an open in the solenoid ground circuit or a short to voltage in the wiring.
What You Might Notice
- Check engine light on
- Possible compressor surge or turbo flutter
- Slight boost performance reduction
Most Common Causes
- 1
Open in bypass valve ground circuit
The ground return for the solenoid circuit is broken, causing the circuit to read high.
- 2
Short to voltage in bypass valve wiring
The solenoid wiring has contacted a power source, pulling the circuit high.
- 3
Failed bypass valve solenoid (open coil)
An open solenoid coil causes the circuit to read high when energized.
How to Diagnose It
- 1
Check Open in bypass valve ground circuit — The ground return for the solenoid circuit is broken, causing the circuit to read high.
- 2
Check Short to voltage in bypass valve wiring — The solenoid wiring has contacted a power source, pulling the circuit high.
- 3
Check Failed bypass valve solenoid (open coil) — An open solenoid coil causes the circuit to read high when energized.
How to Fix It
- 1
Check ground circuit continuity
Verify the solenoid ground return circuit has continuity. An open ground causes high voltage.
- 2
Inspect wiring for shorts to voltage
Trace harness for contact with power sources.
- 3
Test solenoid for open coil
Measure resistance — open reading (OL) confirms failed coil.
- 4
Replace bypass valve solenoid
Install quality replacement.
- 5
Clear and verify
Confirm normal circuit operation.
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