Reductant Heater B Sense Circuit

What to check first

For P24D3, pull the connector and inspect the terminals for spread, corrosion or backed-out pins before testing anything else.

Check these first

• P24D3: Carbon buildup or blockage in the EGR, EVAP, or air injection system
• P24D3: Failed solenoid, valve, or pump in the auxiliary emissions circuit
• P24D3: Wiring, connector, or fuse fault for the emission component
• P24D3: Small leaks in vacuum or EVAP lines
• P24D3: Failing catalytic converter or oxygen sensor reporting incorrectly

What to do next

P24D3 is a fault in the auxiliary emission controls system. The steps below are general, so what actually failed on your vehicle may not be what P24D3 names.

1. P24D3: Read related codes and freeze frame with an OBD-II scanner
2. P24D3: Inspect hoses, valves, and solenoids for leaks, cracks, or carbon buildup
3. P24D3: Smoke test the EVAP or intake system if a leak is suspected
4. P24D3: Command components on/off with a scan tool and watch them respond
5. P24D3: Clean or replace the blocked or failed component

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