P204C GMC Code - Reductant Pressure Sensor Circuit Low
Quick Answer
The Reductant Pressure Sensor, located in the Reductant Pump and Sensor Assembly, responds to pressure changes in the reductant system. Common causes include Faulty Reductant Pump and Sensor Assembly, Reductant Pump and Sensor Assembly harness is open or shorted, Reductant Pump and Sensor Assembly 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
- P204C GMC indicates Reductant Pressure Sensor Circuit Low.
- Common causes
- Common causes include Faulty Reductant Pump and Sensor Assembly, Reductant Pump and Sensor Assembly harness is open or shorted, Reductant Pump and Sensor Assembly 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 P204C GMC Description
connected to the Reductant Control Module via the Controller Area Network (CAN) bus. The Diagnostic Trouble Code (DTC) will be set when the ECM detects that the reductant pressure sensor signal is open or shorted to ground.
What are the Possible Causes of the DTC P204C GMC?
- Faulty Reductant Pump and Sensor Assembly
- Reductant Pump and Sensor Assembly harness is open or shorted
- Reductant Pump and Sensor Assembly circuit poor electrical connection
- Faulty Reductant Control Module
How to Fix the DTC P204C 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 P204C 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 P204C GMC Code
1. What does the OBDII code P204C mean for a GMC vehicle?
P204C indicates the reductant pressure sensor circuit is reading a low signal, which may impact the diesel exhaust fluid (DEF) system.
2. What are the symptoms of the P204C code in a GMC?
Common symptoms include a check engine light, reduced engine power, poor DEF system performance, and possible warning messages related to emissions.
3. What causes the P204C code on a GMC?
Causes include a faulty reductant pressure sensor, damaged wiring or connectors, issues with the DEF pump, or a malfunctioning control module.
4. Can driving with the P204C code cause further damage?
Yes, ignoring this code may lead to reduced engine performance and potentially damage the DEF system over time.
5. How do you diagnose the P204C code on a GMC?
Diagnosis involves scanning for codes, inspecting wiring and connectors, testing the reductant pressure sensor, and verifying proper DEF system operation.
6. How is the P204C code fixed on a GMC vehicle?
Repairs may include replacing the reductant pressure sensor, repairing damaged wiring, or servicing the DEF system components.
7. Does a P204C code require immediate attention?
Yes, it should be addressed promptly to avoid further emissions issues and maintain engine performance.
8. Is the reductant pressure sensor expensive to replace on a GMC?
The cost varies, but the sensor itself is relatively affordable, though labor costs may add to the repair expense.
9. Can low-quality diesel exhaust fluid cause the P204C code?
Yes, contaminated or incorrect DEF can affect system performance and trigger this code.
10. Will clearing the P204C code fix the problem on a GMC?
No, simply clearing the code won’t resolve the underlying issue; proper diagnosis and repair are necessary.
Discuss the causes and fixes for P204C GMC OBDII Code
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