No more adblue Volvo FH500 fault codes
Description of defects and solutions
The vehicle in question
It's a Volvo FH4 500, equipped with a D13K engine operating to Euro 6 standards. This means it is equipped with a DPFS, an AdBlue system and an EGR valve. It has 2 main ECUs to manage exhaust gas treatment. The ACM (post gas treatment unit) and the EMS, (engine control unit). These two units operate on the CANBUS network, exchanging data and transmitting information such as AdBlue fault codes.
Adblue defects on this Volvo FH500
We have 2 defects on this truck.
The usual P207F9A fault code: (it may also be due to other faulty components).
- Oxidation reducer fluid level too low: If the oxidation reducer fluid level is too low, this may result in insufficient NOx reduction and trigger error code P207F9A.
- Oxidation reducer fluid leak: An oxidation reducer fluid leak can lead to a drop in fluid level and cause the same problem as above.
- Insufficient quality of oxidation reducer fluid: If AdBlue is of poor quality or contains impurities, this may result in insufficient NOx reduction and trigger error code P207F9A.
- Oxidation reducer pressure sensor problem: This sensor is responsible for measuring the pressure of the oxidation reducer liquid. If it is malfunctioning or faulty, it may cause this error code to be triggered.
- Oxidation reducer pressure regulating valve problem: This valve is responsible for regulating the pressure of the oxidation reducer liquid. If it is malfunctioning or defective, it may cause this error code to be triggered.
Consequences of codes P207F9A & P20EE00 on the vehicle
Code P207F9A is present and active in the EMS. Engine control module. It therefore generates a message and light on the dashboard [Adblue in yellow/orange] concerning incorrect adblue quality. It also considerably reduces vehicle performance. Engine torque, then speed limited to 20km/h if no solution is found.
Code P207F9A is also related to code P20EE00.
Code P20EE00 indicates that the efficiency of the SCR NOx catalyst is below threshold. The SCR (Selective Catalytic Reduction) catalytic converter is used to reduce NOx emissions by using an oxidation reducer...
NOx catalytic converter fault diagnosed by Volvo
Knowing that the price of a complete NOx catalytic converter (since Volvo is changing the complete exhaust) is too high, our customer will resell the truck for export. The cost is around €8,000 on an FH4. So there's another solution, the one we came up with.
What is our Volvo FH4 fault and adblue removal solution?
The solution is effective. It involves reprogramming the two modules: ACM and EMS. By programming them, we deactivate the error codes linked to the gas post-treatment system. This deactivates NOx commands, AdBlue injection and error code feedback via the CAN network in the case of AdBlue. In the case of exhaust gas filtration (EGR), regeneration is now non-existent, and the particulate filter can be broken or eliminated. The EGR valve no longer opens or closes.
The engine torque and power limits have been permanently removed, as has the maximum speed of 20km/h. It is no longer possible to restrict engine performance due to a fault in the anti-pollution system. Although invisible at the Mines, it's a good idea to carry out this operation if you're exporting your truck to a country where emission standards differ from those in Europe.
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