What this code means
P0035 may mean the PCM is seeing an unexpected high or open-looking signal in the turbocharger bypass control solenoid valve circuit.
What the vehicle may do
- The warning light may be on.
- The vehicle can have possible boost-control or drivability symptoms.
- Some vehicles may show little noticeable change beyond the stored code.
Possible fault areas
- Possible turbocharger bypass control solenoid circuit issue.
- Possible connector or wiring issue.
- Possible PCM-side circuit concern after the circuit checks normally.
Diagnostic path
Open and code logic
On this Civic with the 1.5 turbo engine, P0035 points to the turbocharger bypass control solenoid valve circuit reading high. In plain terms, the PCM is commanding the bypass control solenoid one way, but the return side may look open when the PCM expects it to be closed. The driver may see a warning light, and the vehicle can have possible boost-control or drivability complaints. Broadly, stay focused on the bypass control solenoid circuit, connector and wiring condition, and, only after the circuit checks normally, the PCM side of the circuit.
Start the diagnostic path
Start with the basic troubleshooting approach before jumping into pinpoint testing. Then turn the vehicle to ON mode and use the HDS to command the turbocharger bypass control solenoid valve test. While running that command test, monitor OBD status in PGM-FI for P0035. The scan tool path for the command test is in the PGM-FI function tests under the turbocharger bypass control solenoid valve test.
Set up for circuit inspection
Before disconnecting the PCM connector, jump the SCS line with the HDS and wait more than 1 minute. After that, disconnect the turbocharger bypass control solenoid valve 2P connector, then disconnect PCM connector E, the 80P connector.
ABV open-wire check and decision
Now perform the ABV open wire inspection using the disconnected turbocharger bypass control solenoid valve 2P female terminals and the disconnected PCM connector E 80P female terminals. For the ABV open wire inspection OFF check, normal is less than 1 Ω. If that check is abnormal, treat it as a circuit problem. If the check is normal, the diagnostic path points to a PCM problem. The test depends on the correct connector terminal locations, so if the terminal callouts are not clear at the vehicle, pause, recheck the earlier diagnostic path, and do not guess with the meter leads.
Takeaway
The key split on P0035 is simple: command the bypass solenoid with the scan tool, then prove whether the ABV circuit is open before blaming the PCM side. Keep the circuit test and final confirmation separate, and make sure the code stays gone after the fault is addressed. For more diagnostic training, visit stepdiagnostics.com.
Final check
P0035 is often approached by commanding the bypass solenoid, watching the code status, and then checking whether the related circuit is open before moving toward PCM-side conclusions.
For more guided automotive diagnostics, visit STEP Diagnostics.
