P20C0 Mercedes-Benz Code - Reductant Heater 'B' Control Circuit High
Quick Answer
The reductant heater and sender assembly contains pickup tube for reductant pump module, an electric heating element, a reductant temperature sensor and an electrode type level sensor. Common causes include Faulty Reductant Heater, Reductant Heater harness is open or shorted, Reductant Heater circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P20C0 Mercedes-Benz indicates Reductant Heater 'B' Control Circuit High.
- Common causes
- Common causes include Faulty Reductant Heater, Reductant Heater harness is open or shorted, Reductant Heater circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P20C0 Mercedes-Benz Description
What are the Possible Causes of the DTC P20C0 Mercedes-Benz?
- Faulty Reductant Heater
- Reductant Heater harness is open or shorted
- Reductant Heater circuit poor electrical connection
How to Fix the DTC P20C0 Mercedes-Benz?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P20C0 Mercedes-Benz code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P20C0 Mercedes-Benz Code
1. What does the OBDII code P20C0 mean on a Mercedes-Benz?
P20C0 indicates an issue with the Reductant Heater 'B' control circuit, specifically a high voltage condition. This component is part of the diesel exhaust fluid (DEF) system that helps reduce emissions.
2. What are the symptoms of the P20C0 code on a Mercedes-Benz?
Common symptoms include the check engine light turning on, poor DEF system performance, potential limp mode activation, and increased emissions.
3. What causes the P20C0 code to appear on a Mercedes-Benz?
This code is typically caused by a faulty reductant heater, damaged wiring or connectors in the control circuit, or a malfunctioning DEF control module.
4. How do I diagnose the P20C0 code on my Mercedes-Benz?
Start by scanning with an OBDII tool to confirm the code. Then inspect the wiring, connectors, and reductant heater for signs of damage or corrosion. Test the circuit for proper voltage levels.
5. Can I still drive my Mercedes-Benz with the P20C0 code?
While the car may remain drivable, ignoring the issue could lead to increased emissions, reduced DEF system functionality, and potential long-term damage to the emissions system.
6. How do I fix the P20C0 code on a Mercedes-Benz?
Repairs may include replacing the reductant heater, repairing damaged wiring or connectors, or updating/reprogramming the DEF control module if needed.
7. How much does it cost to repair the P20C0 code on a Mercedes-Benz?
Repair costs can vary widely depending on the issue. Replacing the reductant heater typically costs $300-$800, including parts and labor.
8. Can a damaged reductant heater cause the P20C0 code?
Yes, a damaged or malfunctioning reductant heater is one of the primary causes of this code, as it prevents proper heating of the DEF system.
9. Do I need special tools to fix the P20C0 code on a Mercedes-Benz?
You may need an OBDII scanner, a multimeter for electrical testing, and possibly specific tools for accessing and replacing the reductant heater.
10. Can a software update clear the P20C0 code on my Mercedes-Benz?
In some cases, a software update or reprogramming of the DEF control module may resolve the issue, but this depends on the root cause of the problem.
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