P20C5 GMC Code - Reductant Heater 'D' Control Circuit/Open
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
- P20C5 GMC indicates Reductant Heater 'D' Control Circuit/Open.
- 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 P20C5 GMC Description
What are the Possible Causes of the DTC P20C5 GMC?
- Faulty Reductant Heater
- Reductant Heater harness is open or shorted
- Reductant Heater circuit poor electrical connection
How to Fix the DTC P20C5 GMC?
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 P20C5 GMC 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 P20C5 GMC Code
1. What does the OBDII code P20C5 mean for a GMC vehicle?
P20C5 indicates a problem in the Reductant Heater 'D' control circuit, such as an open circuit or failure in the wiring or heater itself.
2. What are the symptoms of the P20C5 code in a GMC?
Common symptoms include an illuminated check engine light, poor DEF (Diesel Exhaust Fluid) system performance, and potentially reduced engine power.
3. What causes the P20C5 code to appear on a GMC vehicle?
Causes can include a faulty reductant heater, damaged wiring or connectors, a blown fuse, or a malfunctioning control module.
4. Can I drive my GMC with a P20C5 code?
Driving with this code is possible short-term, but it may lead to DEF system issues, reduced fuel efficiency, or reduced engine power if not addressed.
5. How do I diagnose the P20C5 code on my GMC?
Diagnosis involves checking the heater's resistance, inspecting wiring and connectors for damage, and testing the control circuit for proper voltage.
6. How much does it cost to fix a P20C5 code on a GMC?
Repair costs vary, but replacing a reductant heater can cost between $200 and $600, depending on parts and labor.
7. Can a blown fuse cause the P20C5 code on a GMC?
Yes, a blown fuse in the reductant heater circuit can trigger this code and should be checked during diagnostics.
8. How do I reset the P20C5 code after repairs on my GMC?
After repairs, use an OBDII scan tool to clear the code and verify that it does not return after a test drive.
9. Does the P20C5 code affect emissions on a GMC?
Yes, this code can impact emissions as it relates to the DEF system, which reduces NOx emissions in diesel engines.
10. Is the P20C5 code common in GMC diesel vehicles?
Yes, this code is relatively common in GMC diesel vehicles with DEF systems, especially in colder climates where the reductant heater is more active.
Discuss the causes and fixes for P20C5 GMC OBDII Code
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