AdBlue Fault or SCR Problem – NOx Errors, No-Start Countdown & Solutions

AdBlue OFF – AdBlue Deactivation for SCR Faults, NOx Errors and No-Start Countdown

AdBlue fault? Is your vehicle showing an SCR warning, NOx sensor error, counting down the remaining miles or kilometres until the engine cannot be restarted, or does the warning stay on even after refilling AdBlue? At ECUSale, we specialise in ECU diagnostics and programming, including solutions related to SCR and AdBlue systems.

We work with vehicles including Fiat Ducato, Peugeot Boxer, Citroën Jumper, Iveco Daily, VW Crafter, VW Transporter T6, Mercedes Sprinter, Renault Master, Ford Transit, BMW and many other passenger cars and commercial vehicles equipped with SCR/AdBlue systems.

You do not need to know the exact ECU type. Contact us and provide the make, model, year, engine and a description of the problem. If you have diagnostic results, send us the fault codes and a clear photo of the ECU label.

Table of Contents

What Is AdBlue OFF?

AdBlue OFF refers to a modification of the relevant functions in the engine ECU software associated with the SCR/AdBlue system.

SCR systems using AdBlue are widely used in modern diesel vehicles. They are especially common in vehicles produced from around 2017 onwards, although many passenger cars and commercial vehicles manufactured earlier were also equipped with AdBlue.

There is no single programming method that works for every vehicle. The correct procedure depends on the ECU manufacturer, ECU family, hardware version, software version and vehicle configuration.

For this reason, identifying the exact engine ECU is an important part of assessing an AdBlue-related service.

AdBlue Fault – Common Problems Reported by Drivers

Customers often contact us when the vehicle begins displaying SCR or AdBlue warnings on the dashboard.

Common AdBlue problems include:

• AdBlue system fault,
• SCR system fault,
• AdBlue warning light,
• Check Engine light together with an AdBlue warning,
• AdBlue warning still on after refill,
• AdBlue message does not disappear after topping up,
• NOx sensor fault,
• no communication with NOx sensor,
• AdBlue pump fault,
• AdBlue injector or dosing unit problem,
• SCR pressure fault,
• reduced engine power or limp mode,
• AdBlue countdown to engine no-start,
• vehicle cannot be restarted.

Engine ECU during diagnostics and programming. The exact service procedure depends on the ECU model, hardware and software version.

AdBlue Countdown – “Engine Will Not Restart in 500 Miles / 800 km”

One of the most serious AdBlue-related warnings is a countdown to the point at which the engine can no longer be restarted.

The exact message varies depending on the vehicle manufacturer. Drivers commonly search for phrases such as:

• AdBlue no start in 500 miles,
• AdBlue no restart in 800 km,
• engine will not start in 1000 km,
• AdBlue countdown warning,
• SCR fault no restart,
• AdBlue start prevented,
• AdBlue no restart after refill,
• AdBlue warning after topping up,
• AdBlue countdown still active after refill.

Simply refilling the AdBlue tank does not always solve the problem. The cause may be a NOx sensor, AdBlue pump, injector, wiring fault, SCR pressure problem or another system fault stored in the ECU.

NOx Sensor Fault and AdBlue Problems

NOx sensors are an important part of the SCR system. A faulty sensor or loss of communication with its control module can trigger emission-related faults, the Check Engine light and AdBlue/SCR warnings.

Common customer reports include:

• NOx fault after replacing the sensor,
• NO communication with NOx sensor,
• NOx sensor fault returns after clearing,
• Check Engine and AdBlue warning together,
• AdBlue countdown despite the tank being full.

Have you replaced the NOx sensor but the fault is still present? Send us the diagnostic codes and vehicle details so we can check your specific case.

VW T6 – U029E00 “NOx Sensor 2 – No Communication”

A real example of an SCR system problem is a Volkswagen Transporter T6 we diagnosed. The ECU stored an active communication fault relating to the second NOx sensor.

Real VW T6 diagnostic example: U029E00 – NOx Sensor 2, no communication.

This is a good example of a situation where the driver may initially describe the issue simply as an AdBlue problem on a VW T6, while the diagnostic scan provides a more precise direction – no communication with NOx sensor 2.

Do you have a VW T6 with an NOx fault, SCR warning or AdBlue countdown? Send us a photo of the diagnostic screen together with the vehicle details.

AdBlue OFF – Fiat Ducato, Peugeot Boxer, Citroën Jumper and Iveco Daily

A significant number of the vehicles we work with are commercial vans and light commercial vehicles.

AdBlue problems are particularly common in vehicles covering high annual mileage, including:

View Available Engine ECUs

• Fiat Engine ECUs →
• Peugeot Engine ECUs →
• Citroën Engine ECUs →
• Iveco Engine ECUs →
• Volkswagen Engine ECUs →

AdBlue OFF for Passenger Cars and Commercial Vehicles

AdBlue is not limited to vans and commercial vehicles. We also work with many diesel passenger cars equipped with SCR systems.

We work with engine ECUs used in brands including:

View All Engine Control Units (ECUs) →

Which ECU Types Do We Support for AdBlue OFF?

The possibility and method of carrying out an AdBlue-related ECU service depends primarily on the exact ECU type and software version.

Examples of ECU families we work with include:

Cannot see your ECU on the list? That does not mean we cannot work with it. The list above only shows selected examples.

Send us a clear photo of the ECU label and we will check the part number and available options.

ECU Manufacturers

BMW AdBlue OFF – Bosch EDC17CP45 and Other BMW DDE ECUs

We also work with BMW diesel vehicles equipped with SCR/AdBlue systems.

Our experience includes Bosch EDC17CP45 and other BMW DDE engine control units.

For BMW vehicles, our services are not limited to ECU programming. We also offer BMW engine ECU repair and tested replacement engine control units.

One problem found in some BMW diesel vehicles is diesel fuel travelling through the wiring and entering the engine ECU connector. This can lead to communication faults and eventually damage the ECU.

BMW AdBlue, SCR, NOx or DDE ECU problem? Send us the ECU part number together with a photo of the diagnostic results.

How Much Does AdBlue OFF Cost?

The price depends on the vehicle and the exact engine ECU. There is no single price for all controllers because older and newer ECUs use different security systems, reading methods and programming procedures.

Prices shown above are indicative. The exact price is confirmed after checking the vehicle details or ECU part number.

AdBlue OFF at Our Workshop – Bring Your Vehicle to ECUSale

For supported vehicles, diagnostics and ECU programming can be carried out directly at our workshop in Poland.

Please contact us before travelling. Provide the vehicle model, year, engine and preferably the AdBlue/SCR diagnostic fault codes.

Send Your ECU to ECUSale – AdBlue OFF by Mail

You do not need to bring the complete vehicle. In many cases, the engine ECU can be removed and sent directly to ECUSale.

After receiving your ECU, we:

1. identify the ECU and software version,
2. read the required ECU data,
3. perform the previously agreed service,
4. check the ECU,
5. ship the controller back to the customer.

Please contact us before sending your ECU. This allows us to confirm whether the service is available for your controller and provide the price in advance.

Check ECUSale shipping and delivery information →

Buy a Prepared Engine ECU – Worldwide Shipping

If you do not want to send your original ECU, or your controller is damaged, in many cases we can supply a replacement engine ECU from our stock.

ECUSale stocks a large selection of engine control units for passenger cars and commercial vehicles. Before purchasing, always compare the numbers on the original ECU label.

Depending on the controller, we can prepare the required configuration and ship the ECU directly to the customer.

VIEW ENGINE CONTROL UNITS →

If you cannot find your exact ECU number in our online store, send us a clear photo of your original ECU and we will check our available stock.

What Information Should You Send for an AdBlue OFF Quotation?

You do not need to be a mechanic or know the exact ECU model. The more information you provide, the faster we can check the vehicle and controller.

AdBlue OFF – Frequently Asked Questions

AdBlue Problem? Contact ECUSale