P20D4
Exhaust Aftertreatment Fuel Injector B Control Circuit High
P20D4 is an OBD-II diagnostic trouble code meaning: Exhaust Aftertreatment Fuel Injector B Control Circuit High. Common causes: broken or damaged control circuit wires, oxidation of injector connector contacts. Estimated repair cost: $56–167.
Symptoms
- Check Engine Light Is On
- Reduced engine power
- Increased fuel consumption
- Problems with diesel particulate filter regeneration
- Increased level of harmful emissions
Causes
- Broken or damaged control circuit wires
- Oxidation of injector connector contacts
- Fuel injector B itself is faulty
- Problems with the engine control unit
- Short circuit in control circuit
How to Fix
- Check the integrity of the wiring and contacts in the control circuit
- Measure the injector resistance (compare with the norm)
- Check the voltage at the injector connector
- If necessary, replace injector B of the aftertreatment system
- Check the operation of the system after repair using an OBD-II scanner
Related codes
Error P20D4 by Vehicle Brand
FAQ
What does the P20D4 code mean?
P20D4 is an OBD-II diagnostic trouble code that indicates: Exhaust Aftertreatment Fuel Injector B Control Circuit High
What causes a P20D4 error code?
The most common causes of P20D4 include: Broken or damaged control circuit wires; Oxidation of injector connector contacts; Fuel injector B itself is faulty; Problems with the engine control unit.
How do I fix a P20D4 diagnostic trouble code?
To fix P20D4: Check the integrity of the wiring and contacts in the control circuit. Measure the injector resistance (compare with the norm). Check the voltage at the injector connector. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P20D4?
Yes, but get it checked soon
How much does it cost to fix P20D4?
The estimated repair cost for P20D4 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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