P2D15: Exhaust Flow Control Valve C Control Circuit High

The exhaust flow control valve C reports a control circuit high condition. Exhaust routing for back-pressure or noise control on this branch cannot be commanded reliably.

Medium severity. Can I keep driving?You can usually keep driving in the short term. If you smell exhaust fumes in the cabin, stop driving and ventilate the car.

Most likely causes

Control wire shorted to B+
Open actuator coil
Connector pins corroded - high contact resistance

What to check, in order

Start with the simplest. You can tick off each step.

Look for leaks and visible damage
Check the sensor's ground and make sure the signal wire is not receiving voltage from another circuit.
Check the connectors and wires near the exhaust
Check the live data
Test the actuator with the scanner

Good to know

Repair difficulty: medium
It can trigger limp mode.
It affects emissions.

What each character of P2D15 means

P: Powertrain: engine and transmission
2: Generic code: same on every make
D: Subsystem depends on the code range
15: Specific fault in that system

Frequently asked questions

Can I keep driving with code P2D15?

You can usually keep driving in the short term. If you smell exhaust fumes in the cabin, stop driving and ventilate the car.

What causes code P2D15?

The most common causes are: control wire shorted to B+; open actuator coil; connector pins corroded - high contact resistance.

Related codes

Sources

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.