What Does P20D7 Mean?
The PCM has detected an open circuit or electrical fault in the fuel supply control circuit for the exhaust aftertreatment system. This circuit controls the pump or valve that supplies fuel to the exhaust injectors.
Common Causes
35%
Open or damaged wiring in exhaust fuel pump/valve control circuit
30%
Failed exhaust aftertreatment fuel pump or control valve
15%
Blown fuse or faulty relay for exhaust fuel supply system
12%
Corroded or loose connector at fuel pump or control valve
8%
PCM internal driver circuit failure for fuel supply control
Diagnostic Steps
1
Step 1: Check all fuses and relays related to exhaust aftertreatment fuel supply system
2
Step 2: Inspect exhaust fuel pump/valve connector and wiring for damage or corrosion
3
Step 3: Measure resistance of fuel pump/valve coil or motor (compare to specifications)
4
Step 4: Verify power and ground circuits at fuel pump/valve connector with key on
5
Step 5: Command fuel pump/valve on with scan tool and monitor circuit voltage/current
6
Step 6: Check for PCM control signal output using multimeter or oscilloscope
Estimated Repair Cost
$200 - $1,800
Parts + labor, varies by vehicle and location
The PCM has detected an open circuit or electrical fault in the fuel supply control circuit for the exhaust aftertreatment system. This circuit controls the pump or valve that supplies fuel to the exhaust injectors.
The most common cause of P20D7 (Exhaust Aftertreatment Fuel Supply Control Circuit/Open) is: Open or damaged wiring in exhaust fuel pump/valve control circuit
Typical repair costs for P20D7 range from $200 to $1,800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle remains safe to drive but all exhaust injectors will be non-functional, preventing regeneration and potentially causing severe DPF clogging. Should be repaired before extensive driving.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P20D7 to identify the root cause.
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Quick Info
Category
Powertrain
System
Exhaust Aftertreatment System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
