AutoCodes – Generic – P2ADD

P2ADD Code - Reductant Tank Temperature Sensor 2 Circuit Erratic

Quick Answer

The Reductant Quality Sensor includes an integrated temperature sensor to measure reductant fluid temperature. Common causes include Faulty Reductant Quality Sensor, Reductant Quality Sensor harness is open or shorted, Reductant Quality 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: P2ADD indicates Reductant Tank Temperature Sensor 2 Circuit Erratic.
Common causes: Common causes include Faulty Reductant Quality Sensor, Reductant Quality Sensor harness is open or shorted, Reductant Quality 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 523

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 Aug 01, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P2ADD Description

The Reductant Quality Sensor includes an integrated temperature sensor to measure reductant fluid temperature. The Reductant Quality Sensor is located in the reductant tank and uses an ultrasonic signal to measure reductant fluid quality. The Reductant Quality Sensor communicates with the Reductant Control Module using serial data. The Diagnostic Trouble Code (DTC) will be set when the Reductant Control Module detects a performance fault on the reductant quality sensor temperature signal for greater than 1 s.

OBDII Code P2ADD - Reductant Tank Temperature Sensor 2 Circuit Erratic - AutoCodes.com — P2ADD Code - Reductant Tank Temperature Sensor 2 Circuit Erratic

What does this mean?

What are the Possible Causes of the DTC P2ADD?

Faulty Reductant Quality Sensor
Reductant Quality Sensor harness is open or shorted
Reductant Quality Sensor circuit poor electrical connection
Faulty Reductant Control Module

How to Fix the DTC P2ADD?

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 P2ADD 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.

Need more information about the P2ADD code?

Need more information on how to fix the P2ADD code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P2ADD code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P2ADD Buick — Reductant Tank Temperature Sensor 2 Circuit Erratic
P2ADD Cadillac — Reductant Tank Temperature Sensor 2 Circuit Erratic
P2ADD Chevrolet — Reductant Tank Temperature Sensor 2 Circuit Erratic
P2ADD GMC — Reductant Tank Temperature Sensor 2 Circuit Erratic

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.