Engine-Codes - Generic - P20B7

P20B7 Code - Diesel Exhaust Fluid Reductant Pump Heater Control Circuit Low

- Code Popularity: 23,261 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC P20B7?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Selective Catalytic Reduction (SCR) Module Circuit
  • Faulty Diesel Exhaust Fluid Dosing Control Unit (DEF DCU)
  • Diesel Exhaust Fluid Dosing Control Unit harness is open or shorted
  • Diesel Exhaust Fluid Dosing Control Unit circuit poor electrical connection
  • Faulty Power Distribution Center
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How to Fix the DTC P20B7?

Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

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What is the Cost to Diagnose the Code?

Labor: 1.0

The cost to diagnose the P20B7 code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

What Does the P20B7 Code Mean?

The Powertrain Control Module (PCM) controls the Diesel Exhaust Fluid (DEF) Heaters via datalink communication with the Diesel Exhaust Fluid Dosing Control Unit (DEF DCU - sometimes referred to as the Selective Catalytic Reduction (SCR) Module). The DEF DCU receives two voltage supplies: One from the SCR Relay 1 (which is activated upon startup). And the other is a fused B+ supply. The DEF Tank electric heater and DEF Line Heater power supply and ground circuits are wired directly to the DCU. The DEF Tank Heater is integrated into the DEF Supply Pump assembly and is not serviced separately.
Activation of the DEF Supply Line and DEF Tank Heaters operate independently of each other. Line heating is based on the Ambient Temperature Sensor input and Tank heating is based on the DEF Tank Temperature Sensor value. Heating of the Line or Tank Heater is initiated when the corresponding temperature value is below -5°C (23°F). Heating stops when the corresponding temperature value goes above -4°C (24.8°F). The DEF Dosing Control Unit monitors these inputs and reports them to the Powertrain Control Module (PCM). The PCM will illuminate the MIL lamp after this diagnostic runs and fails. The PCM will turn off the MIL light when the monitor runs and passes in three consecutive key cycles. The Diagnostic Trouble Code (DTC) will be set when the DEF Dosing Control Unit detects low voltage on the SCR Module Heater Supply circuit.

P20B7 Code - Diesel Exhaust Fluid Reductant Pump Heater Control Circuit Low

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Code P20B7 Information for Specific Makes

  • P20B7 Dodge Diesel Exhaust Fluid Reductant Pump Heater Control Circuit Low  📷
  • P20B7 RAM Diesel Exhaust Fluid Reductant Pump Heater Control Circuit Low  📷

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