AutoCodes – Audi – P0128 Audi

P0128 Audi Code - Coolant Temperature Below Operating Range

Quick Answer

Indicates that the thermostat monitor has not achieved the required engine operating temperature within a specified amount of time after starting the engine. Common causes include Leaking or stuck open thermostat, Low engine coolant level, Insufficient warm up time. 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: P0128 Audi indicates Coolant Temperature Below Operating Range.
Common causes: Common causes include Leaking or stuck open thermostat, Low engine coolant level, Insufficient warm up time.
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 Step-by-Step Diagnostic Guide My Repairs

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

Code Popularity 11,237

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
Add Comment

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

Code P0128 Audi Description

Indicates that the thermostat monitor has not achieved the required engine operating temperature within a specified amount of time after starting the engine.

OBDII Code P0128 Audi - Coolant Temperature Below Operating Range - AutoCodes.com — P0128 Audi Code - Coolant Temperature Below Operating Range

What does this mean?

What are the Possible Causes of the DTC P0128 Audi?

Leaking or stuck open thermostat
Low engine coolant level
Insufficient warm up time
Faulty engine coolant temperature sensor
Engine coolant temperature sensor harness is open or shorted
Engine coolant temperature sensor circuit poor electrical connection

How to Fix the DTC P0128 Audi?

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 does this mean?

Code Tech Notes

If cooling system is not leaking and the fluid level is OK, replacing the thermostat usually takes care of the problem.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0128 Audi 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 P0128 Audi code?

Need more information on how to fix the P0128 Audi code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0128 Audi code diagnosed by a professional: Find a repair shop in your area

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 P0128 Audi Code

1. What are the common symptoms of OBDII code P0128 in an Audi?

- Common symptoms may include the temperature gauge reading lower than normal, a check engine light illuminated on the dashboard, and potentially reduced heating performance inside the vehicle.

2. What are the typical causes of the OBDII code P0128 in an Audi?

- The most common causes of this code include a faulty thermostat, low coolant level, a malfunctioning coolant temperature sensor, or issues with the cooling system.

3. How can I diagnose the OBDII code P0128 in my Audi?

- Diagnosis typically involves checking the coolant level, inspecting the thermostat for proper operation, testing the coolant temperature sensor, and ensuring there are no leaks or blockages in the cooling system.

4. Can I continue driving my Audi with the OBDII code P0128 present?

- It is not recommended to drive your Audi with this code present, as it can lead to potential engine overheating and other issues. It is best to address the problem promptly.

5. How can I reset the OBDII code P0128 in my Audi?

- The code can be reset using an OBDII scanner, but it is important to first diagnose and fix the underlying issue causing the code before resetting it.

6. Are there any DIY repair tips for fixing the OBDII code P0128 in an Audi?

- DIY repair tips may include replacing the thermostat, topping up coolant levels, checking for leaks, and ensuring all components in the cooling system are functioning properly.

7. How much does it typically cost to repair the OBDII code P0128 in an Audi?

- The cost of repairs can vary depending on the specific issue causing the code, but it may range from a few hundred to over a thousand dollars, depending on the extent of the repairs needed.

8. What happens if the OBDII code P0128 is ignored in an Audi?

- Ignoring this code can lead to potential engine damage, overheating, and other serious issues that can result in costly repairs or even engine failure if not addressed promptly.

9. Can extreme weather conditions trigger the OBDII code P0128 in an Audi?

- Yes, extreme cold weather conditions can sometimes trigger this code if the coolant temperature drops below the operating range due to insufficient warming up of the engine.

10. Is it safe to drive my Audi to a repair shop with the OBDII code P0128 present?

- It is generally safe to drive a short distance to a repair shop if the engine temperature gauge remains stable and there are no signs of overheating. However, it is best to address the issue promptly to avoid potential damage.