AutoCodes – Dodge – P204A Dodge

P204A Dodge Code - Reductant Pressure Sensor Circuit

Quick Answer

The Diesel Exhaust Fluid (DEF) Pressure Sensor is a three wire sensor, integrated into the DEF Supply Pump and is not serviceable separate from the pump. 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: P204A Dodge indicates Reductant Pressure Sensor Circuit.
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.

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Code Popularity 8,766

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Mar 21, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P204A Dodge Description

The Diesel Exhaust Fluid (DEF) Pressure Sensor is a three wire sensor, integrated into the DEF Supply Pump and is not serviceable separate from the pump. The DEF Pressure Sensor monitors supply pressure to the DEF Injector. The Diesel Exhaust Fluid (DEF) Dosing Control Unit provides a 5-Volt Supply and a ground to the DEF Pressure Sensor. The sensor provides a signal to the DEF Dosing Control Unit on the DEF Pressure Sensor Signal circuit. This DEF Pressure Sensor Signal voltage changes, based on the diesel exhaust fluid pressure supplied by the DEF Supply Pump. The DEF Dosing Control Unit uses this information to vary pump speed and maintain the 130 psi (9 bar) pressure needed for proper DEF injection. The DEF Dosing Control Unit will detect a low signal voltage at low diesel exhaust fluid pressures, and a high signal voltage at high diesel exhaust fluid pressures.
The DEF Dosing Control Module will illuminate the MIL light via the Powertrain Control Module (PCM) immediately after the diagnostics runs and fails. Diesel exhaust fluid injection into the after-treatment system is disabled. The DEF Dosing Control Module will turn off the MIL light via the PCM when the monitor runs and passes in three consecutive key cycles.

OBDII Code P204A Dodge - Reductant Pressure Sensor Circuit - AutoCodes.com — P204A Dodge Code - Reductant Pressure Sensor Circuit

What does this mean?

What are the Possible Causes of the DTC P204A Dodge?

Faulty Reductant Pressure Sensor
Reductant Pressure Sensor harness is open or shorted
Reductant Pressure Sensor circuit poor electrical connection

How to Fix the DTC P204A Dodge?

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 P204A Dodge 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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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P204A Dodge Code

What does the OBDII code P204A mean for a Dodge vehicle?

The P204A code indicates a problem with the reductant pressure sensor circuit, which is responsible for monitoring the pressure of the diesel exhaust fluid (DEF) in the vehicleâ€™s selective catalytic reduction (SCR) system.

What are the common symptoms of the P204A code?

Common symptoms include the check engine light being illuminated, reduced engine power, poor fuel economy, and potential engine stalling in some cases.

What could cause the P204A code to appear?

Causes may include a faulty reductant pressure sensor, wiring issues such as shorts or breaks in the circuit, a malfunctioning SCR system, or problems with the DEF quality.

How can I diagnose the P204A code?

To diagnose the P204A code, check the sensor and its wiring for damage, use a multimeter to test the sensor's resistance, and ensure that the DEF is not contaminated or low.

What repairs can fix the P204A code?

Repairs may involve replacing the reductant pressure sensor, repairing or replacing damaged wiring, ensuring proper DEF quality, or addressing issues in the SCR system.

Is it safe to drive with the P204A code?

While it may be safe for a short period, driving with this code can lead to reduced engine performance and potential emissions issues, so it's best to address it promptly.

Will clearing the code P204A make the problem go away?

Clearing the code may temporarily turn off the check engine light, but unless the underlying issue is resolved, the code will likely reappear.

Can I fix the P204A code myself?

If you have experience with automotive repairs, you may be able to replace the sensor or repair wiring. However, for more complex issues, consulting a professional mechanic is recommended.

How much does it typically cost to repair the P204A code?

Repair costs can vary widely based on the specific issue; sensor replacement might cost around $100-$300, while more extensive repairs could range from $300 to $1,000 or more.