OBD code P20FB indicates an issue with the Diesel Exhaust Fluid (DEF) pump circuit.
Symptoms include the Engine Light being ON.
Common causes are a faulty DEF pump, open/shorted harness, poor electrical connection, or a faulty Powertrain Control Module (PCM).
This code should be addressed promptly to prevent emissions system problems.
A possible fix involves inspecting and repairing the wiring harness and connectors related to the DEF pump circuit.
| Repair Importance Level | 10.0 (Out of 10) |
| Estimated Repair Time | Approximately 1.0 hour |
| Repair Difficulty Level | 10.0 (Out of 10) |
Symptoms of the p20fb OBD Code
The vehicle may experience a lack of power or poor acceleration with fault code P20FB.
- Symptoms: Engine Light ON.
- Reduced engine performance.
- Rough idle.
- Engine stalling.
- Turbocharger underboost condition.
Causes of the p20fb OBD Code
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Possible triggers for fault code P20FB include issues with the reductant heater control circuit.
- P20FB can be caused by a Faulty Diesel Exhaust Fluid (DEF) Pump.
- A Diesel Exhaust Fluid Pump harness that is open or shorted.
- A Diesel Exhaust Fluid Pump circuit with poor electrical connection.
- Or a Faulty Powertrain Control Module (PCM).
Fixing Error Code p20fb Step By Step
Replace the faulty exhaust gas temperature sensor in the bank 1 sensor 4 location.
- To fix OBDII code P20FB, first, review the possible causes related to this code.
- Visually examine the wiring harness and connectors associated with the exhaust gas temperature sensor.
- Check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.
- If no issues are found with the wiring and connectors, proceed to test the exhaust gas temperature sensor for proper operation.
- Replace the exhaust gas temperature sensor if it is faulty.
- Clear the fault codes from the vehicle’s computer using a scan tool.
- Test drive the vehicle to ensure the code does not return.
Cost Of Fixing p20fb Fault Code
Diagnosing and repairing fault code P20FB typically involves inspecting and possibly replacing the reductant heater control circuit.
The cost to diagnose and fix OBD code P20FB typically ranges from $75 to $150, with an estimated repair time of 1. 0 hour.
Costs may vary based on labor rates, shop location, and the complexity of the repair needed.
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Details of the p20fb OBD Code
P20FB code indicates a fault with the reductant heater control circuit in a diesel engine.
OBD code P20FB means that the reductant heater control circuit is open.
This code is triggered by the Engine Control Module (ECM) when it detects an open circuit in the reductant heater control system.
The reductant heater is used to warm up the Diesel Exhaust Fluid (DEF) to improve its efficiency in reducing emissions.
When the ECM detects an open circuit in the reductant heater control system, it sets code P20FB to indicate the issue.
Mechanic’s Tech Notes
Code P20FB relates to a fault in the reductant heater control circuit in diesel engines.
To diagnose and fix OBDII code P20FB, start by checking the Transmission Control Module (TCM) power and ground using a multimeter.
Verify TCM communication over the Controller Area Network (CAN) using a scan tool.
If communication issues are found, reprogramming or reflashing the TCM may be necessary.
Additionally, visually inspect the wiring harness and connectors for any damage, and ensure connector pins are not broken, bent, pushed out, or corroded.
This thorough inspection will help identify and address potential causes of the P20FB code.
FAQ
OBD code P20FB indicates an issue with the Diesel Exhaust Fluid (DEF) pump circuit. Check for pump faults, wiring issues, or PCM problems. Inspect and repair as needed.
Common symptoms of OBD code P20FB include Engine Light ON, caused by issues like a faulty DEF pump, harness problems, or PCM issues. Inspect and repair affected components.
Diagnose and repair OBD code P20FB by checking for a faulty DEF pump, open/shorted harness, poor electrical connection, or PCM issue. Inspect wiring and connectors for damage.
Wrap Up
If your check engine light is on and you’re experiencing issues with the exhaust gas recirculation (EGR) system, you may have OBDII code P20FB.
This code typically indicates a problem with the EGR cooler bypass control circuit, which could be caused by a faulty EGR cooler bypass valve, wiring issues, or a poor connection.
To address OBDII code P20FB, start by inspecting the wiring harness and connectors related to the EGR cooler bypass valve.
Check for any damaged wires, loose connections, or corrosion.
Test the EGR cooler bypass valve for
