DTC Advanced Diagnostics: P0475 (2.0L Engine) (2024 2025)

DTC P0475  : Active Exhaust System Electrical Failure

General Description 

Courtesy of HONDA, U.S.A., INC.

The electronic control unit in the active exhaust valve actuator detects error occurred in the active exhaust valve actuator and sends information to the powertrain control module (PCM) via LIN line. If the PCM receives error from the active exhaust valve actuator, the PCM detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type 

Execution	Continuous
Sequence	None
Duration	Depending on the error
DTC Type	Two drive cycles, MIL off

Enable Conditions 

Condition	Minimum	Maximum
12 volt battery voltage [Battery]	10 V	-
Vehicle	ON mode

[ ]: HDS Parameter

Malfunction Threshold 

The PCM receives any of the following error:

• Short circuit to ground on the active exhaust valve actuator circuit for at least 10 seconds.
• Short circuit to power on the active exhaust valve actuator circuit for at least 10 seconds.
• Open circuit on the active exhaust valve actuator circuit for at least 10 seconds.
• Supplied voltage to the active exhaust valve actuator is less than 10 V for at least 45 seconds.
• Supplied voltage to the active exhaust valve actuator is more than 17.5 V for at least 45 seconds.
• High current is detected on the motor during the initial movement for at least 45 seconds.

Possible Cause 

Diagnosis Details 

Conditions for setting the DTC 

When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the PCM memory. If the malfunction returns in the next (second) drive cycle, a Confirmed DTC, the freeze data, and the on-board snapshot are stored. The MIL does not come on.

Conditions for clearing the DTC 

The Pending DTC, the Confirmed DTC, the freeze data, and the on-board snapshot can be cleared with the scan tool clear command.