AutoCodes – Cadillac – P205D Cadillac

P205D Cadillac Code - Reductant Tank Temperature Sensor Circuit High Voltage

Quick Answer

The Reductant Tank Temperature Sensor is a variable resistor used to measure the temperature inside the reductant tank. 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: P205D Cadillac indicates Reductant Tank Temperature Sensor Circuit High Voltage.
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.

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Code Popularity 328

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

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 P205D Cadillac Description

The Reductant Tank Temperature Sensor is a variable resistor used to measure the temperature inside the reductant tank. The sensor is wired to the Reductant Control Module, which acquires the sensor signal and sends it to the Engine Control Module (ECM) via serial data. The Reductant Control Module supplies 5 V to the reductant temperature sensor signal circuit and a ground for the low reference circuit. The Diagnostic Trouble Code (DTC) will be set when the difference between reductant temperature sensor signal and exhaust gas temperature sensor signals is outside a calibrated range.

OBDII Code P205D Cadillac - Reductant Tank Temperature Sensor Circuit High Voltage - AutoCodes.com — P205D Cadillac Code - Reductant Tank Temperature Sensor Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P205D Cadillac?

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 P205D Cadillac?

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 P205D Cadillac 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 P205D Cadillac Code

1. What are the common symptoms of OBDII code P205D in a Cadillac related to the Reductant Tank Temperature Sensor Circuit High Voltage?

The common symptoms include the Check Engine Light illuminating, reduced engine power, poor fuel economy, and potential difficulty starting the vehicle.

2. What are the possible causes of OBDII code P205D in a Cadillac indicating a high voltage in the Reductant Tank Temperature Sensor Circuit?

Potential causes of this code include a faulty reductant tank temperature sensor, damaged wiring or connectors in the sensor circuit, a malfunctioning powertrain control module (PCM), or issues with the reductant tank heater.

3. How can I diagnose the OBDII code P205D in my Cadillac related to the Reductant Tank Temperature Sensor Circuit High Voltage?

Diagnosis typically involves using an OBDII scanner to retrieve the fault code, inspecting the wiring and connectors for damage, testing the reductant tank temperature sensor, and checking the operation of the reductant tank heater.

4. What are some repair tips for addressing OBDII code P205D in a Cadillac with a Reductant Tank Temperature Sensor Circuit High Voltage issue?

Repair tips may include replacing the faulty reductant tank temperature sensor, repairing or replacing damaged wiring or connectors, resetting the fault code with an OBDII scanner, and verifying proper operation of the reductant tank heater.

5. Can driving my Cadillac with OBDII code P205D indicating a high voltage in the Reductant Tank Temperature Sensor Circuit cause further damage?

Continued driving with this issue may lead to reduced engine performance, increased emissions, and potential damage to other components of the emissions control system. It is advisable to address the problem promptly.

6. How important is it to address OBDII code P205D in a Cadillac related to the Reductant Tank Temperature Sensor Circuit High Voltage?

It is crucial to address this code promptly to ensure proper functioning of the emissions control system, maintain optimal engine performance, and prevent potential damage to other components. Ignoring the issue can lead to more serious problems over time.

7. Is it safe to continue driving my Cadillac if the Check Engine Light is on due to OBDII code P205D?

While it may be safe to drive in the short term, it is recommended to address the underlying issue causing the fault code as soon as possible to prevent potential long-term damage and ensure the vehicle operates efficiently and meets emissions standards.

8. How much does it typically cost to repair OBDII code P205D in a Cadillac related to the Reductant Tank Temperature Sensor Circuit High Voltage?

The cost of repairs can vary depending on the specific cause of the issue, parts and labor costs, and the service provider. It is advisable to consult with a qualified mechanic or dealership for an accurate estimate.

9. Can I reset the Check Engine Light after addressing OBDII code P205D in my Cadillac myself?

Yes, you can reset the Check Engine Light using an OBDII scanner once the underlying issue triggering the fault code has been addressed. This will clear the code and turn off the light, allowing you to monitor for any new issues.

10. How can I prevent OBDII code P205D from occurring in my Cadillac in the future?

To prevent this code from occurring again, it is essential to perform regular maintenance on the emissions control system, address any warning signs promptly, use quality DEF (diesel exhaust fluid), and ensure the vehicle is operated under proper driving conditions. Regular vehicle inspections can also help catch potential issues early.