DTC C1020-49, C1021-49

WARNING: This page is about a different car, the 2022 Honda Accord, 2021 Honda Accord, 2020 Honda Accord, 2019 Honda Accord, and 2018 Honda Accord. However, it is still accessible from the selected car via links, so may be relevant.

DTC C1020-49 : VSA Master Cut Valve Failure (Unexpected Operation)DTC C1021-49 : VSA Suction Valve Failure (Unexpected Operation)

NOTE: Before you troubleshoot, review the general troubleshooting information .

DTC Description	DTC
C1020-49 VSA Master Cut Valve Failure (Unexpected Operation)
C1021-49 VSA Suction Valve Failure (Unexpected Operation)

DTC (VSA)

Problem verification

-1. Turn the vehicle to the ON mode.

-2. Clear the DTC with the HDS.

-3. Turn the vehicle to the OFF (LOCK) mode, then start the engine.

-4. Check for DTCs with the HDS.

DTC Description	DTC
C1020-49 VSA Master Cut Valve Failure (Unexpected Operation)
C1021-49 VSA Suction Valve Failure (Unexpected Operation)

Is DTC C1020-49 or C1021-49 indicated?

YES

Check for loose terminals and poor connections in the VSA modulator-control unit 46P connector. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting. If they are OK, replace the VSA modulator-control unit .

Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting .