P04A8 OBD-II: Exhaust Pressure Control Valve "B" Position Sensor/Switch Circuit

P04A8 Severity

Moderate

Will P04A8 go away on its own?

Once the vehicle's onboard system no longer detects the issue, most codes will disappear on their own. If your vehicle still has this code, however, it should be properly diagnosed to avoid a more serious problem.

For a proper diagnosis, RepairPal Certified shops have the equipment, tools, and expertise.

Moderate severity codes might not threaten the vehicle's safety or functionality immediately, but you should still get it diagnosed within a reasonable time frame to keep your car running well.

P04A8 Summary Find a Repair Shop P04A8 Details Ask RepairPal CarGenius Other OBD-II Codes

What causes OBD-II fault code P04A8?

The Exhaust Pressure Control Valve controls exhaust back pressure during engine warmup. If the engine control module (PCM) determines there is an incorrect signal from the Exhaust Pressure Control Valve, the PCM will set code P04A8.

OBD II Fault Code

OBD II P04A8

OBD-II Code Powertrain Control Module (PCM) failure is defined as a Exhaust Pressure Control Valve "B" Position Sensor/Switch Circuit

Common Problems That Trigger the P04A8 Code

Exhaust pressure control valve failure
Powertrain Control Module (PCM) failure
Wiring issue

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Other OBD-II Codes

P04A7: Exhaust Pressure Control Valve "B" Position Sensor/Switch Circuit P04A6: Exhaust Pressure Control Valve "B" Position Sensor/Switch Circuit P04A5: Exhaust Pressure Control Valve "B" Stuck Closed P04A4: Exhaust Pressure Control Valve "B" Stuck Open

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OBD II Fault Code

OBD II P04A8

OBD-II Code Powertrain Control Module (PCM) failure is defined as a Exhaust Pressure Control Valve "B" Position Sensor/Switch Circuit

Common Problems That Trigger the P04A8 Code

Exhaust pressure control valve failure
Powertrain Control Module (PCM) failure
Wiring issue

P04A8 OBD-II: Exhaust Pressure Control Valve "B" Position Sensor/Switch Circuit

Will P04A8 go away on its own?

What causes OBD-II fault code P04A8?

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OBD II Fault Code

Common Problems That Trigger the P04A8 Code

Ask our experts about P04A8.

Other OBD-II Codes

OBD Code Resources

Need a P04A8 diagnosis? Trust our experts.

OBD II Fault Code

Common Problems That Trigger the P04A8 Code