What Does P045D Mean?
The EGR 'B' control circuit voltage is above the PCM's maximum expected threshold. This high circuit condition typically indicates an open circuit in the valve solenoid or motor, an open ground wire, or the control wire shorted to voltage. The PCM cannot command the EGR 'B' valve, and it will likely default to the closed position. The driver will see a check engine light and may notice elevated emissions or slight performance changes.
Common Causes
30%
Open circuit in the EGR 'B' valve solenoid or motor winding
25%
Open ground wire in the EGR 'B' control circuit
20%
Control wire shorted to battery voltage in the harness
20%
Corroded or disconnected connector at the EGR 'B' valve
5%
PCM output driver failure (stuck high)
Diagnostic Steps
1
Disconnect the EGR 'B' valve connector and measure the solenoid/motor coil resistance. An infinite (OL) reading means the coil is open and the valve needs replacement.
2
Check the ground wire continuity from the harness connector back to the PCM. Should be under 2 ohms. An open ground will cause voltage to float high.
3
Check the control wire for a short to battery voltage with the harness disconnected at both ends. Measure from the wire to battery positive—should read OL.
4
Inspect the valve connector for heat damage, corrosion, backed-out pins, or broken terminal locks. The high-temperature environment around EGR components accelerates connector degradation.
5
If wiring and valve test good, use a lab scope at the PCM connector to verify the output driver is functioning and not stuck in a high state.
Estimated Repair Cost
$150 - $600
Parts + labor, varies by vehicle and location
The EGR 'B' control circuit voltage is above the PCM's maximum expected threshold. This high circuit condition typically indicates an open circuit in the valve solenoid or motor, an open ground wire, or the control wire shorted to voltage. The PCM cannot command the EGR 'B' valve, and it will likely...
The most common cause of P045D (Exhaust Gas Recirculation "B" Control Circuit High) is: Open circuit in the EGR 'B' valve solenoid or motor winding
Typical repair costs for P045D range from $150 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Generally safe to drive for short distances. The EGR 'B' valve will default to closed, meaning no exhaust gas recirculation. This increases NOx emissions and may cause slight engine knocking under load. Repair promptly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P045D to identify the root cause.
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Quick Info
Category
Powertrain
System
EGR / Emissions System
Difficulty
Type
Generic (SAE)
Recommended Tools
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