P204E GMC Code - Reductant Pressure Sensor Circuit Intermittent/Erratic
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 Pressure Sensor, Reductant Pressure Sensor harness is open or shorted, Reductant Pressure Sensor 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
- P204E GMC indicates Reductant Pressure Sensor Circuit Intermittent/Erratic.
- Common causes
- Common causes include Faulty Reductant Pressure Sensor, Reductant Pressure Sensor harness is open or shorted, Reductant Pressure Sensor 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 P204E 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 P204E GMC?
- Faulty Reductant Pressure Sensor
- Reductant Pressure Sensor harness is open or shorted
- Reductant Pressure Sensor circuit poor electrical connection
How to Fix the DTC P204E 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 P204E 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 P204E GMC Code
What does the OBDII code P204E mean for GMC vehicles?
The P204E code indicates an intermittent or erratic issue in the reductant pressure sensor circuit, which monitors the pressure of diesel exhaust fluid (DEF) in the system.
What are the common symptoms of the P204E code in GMC vehicles?
Symptoms can include the check engine light turning on, poor DEF system performance, reduced engine power, and difficulty passing emissions tests.
What causes the P204E code to appear on GMC vehicles?
The code is typically caused by issues such as a faulty reductant pressure sensor, damaged wiring or connectors in the sensor circuit, or problems with the DEF pump.
How can I diagnose the P204E code on my GMC?
Start by scanning the vehicle with an OBDII tool, inspecting the wiring and connectors for damage, and testing the reductant pressure sensor for proper function.
Can I drive my GMC with the P204E code?
While you may still be able to drive the vehicle, ignoring the code can lead to reduced engine performance and potential damage to the DEF system. It's best to address the issue promptly.
How do I fix the P204E code on my GMC vehicle?
Repairs may involve replacing the reductant pressure sensor, repairing damaged wiring or connectors, or addressing issues with the DEF pump.
What tools are needed to fix the P204E code?
You’ll typically need an OBDII scanner, a multimeter for electrical testing, and basic automotive tools for sensor or wiring replacement.
Is the P204E code covered under warranty for GMC vehicles?
Coverage depends on your vehicle’s warranty terms, but emissions-related components often have extended coverage. Check with your dealer for details.
How much does it cost to repair the P204E code on a GMC?
Repair costs vary, but replacing the reductant pressure sensor typically ranges from $150 to $400, including parts and labor.
Can a software update fix the P204E code on GMC vehicles?
In some cases, a software update from the manufacturer can resolve intermittent sensor issues, but physical repairs are often required.
Discuss the causes and fixes for P204E GMC OBDII Code
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