“Friendly and efficient service, sorted out my adblue issue and did a stage 1 remap on my range rover. Would use again”
Dec Halford
3 Oct 2026
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P20BA is a generic diagnostic code meaning "Reductant heater A control circuit performance". It is recorded when the engine control system detects a problem with the AdBlue heater circuit. It is a shared code used by many manufacturers, so the cause varies by vehicle and has to be confirmed with a full diagnostic check.
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Emergency Mobile AdBlue Assistance. Additional emergency callout charge applies. Subject to availability.
01Understanding the service
Symptoms vary by vehicle. These are the most commonly reported:
These are possible causes, not a diagnosis. The code alone doesn't tell you which part has failed.
Every vehicle is checked before any work or price is agreed.
We confirm the fault first, then explain the options for your vehicle, including AdBlue Delete and Removal software where your vehicle is suitable. If a different kind of work is needed, we'll tell you honestly.
We are based in Slough and cover Heathrow, London and around 70 miles, plus wider areas through our technician network. Same-day and next-day appointments may be available, subject to technician availability.
From booking to completion, our experienced mobile technicians make the process straightforward.
We confirm your vehicle, location, service and appointment.
On the day, your technician calls with an estimated arrival time.
We connect diagnostic equipment, check the vehicle and identify relevant faults.
We read the original ECU software, prepare the AdBlue modification and apply it.
Final diagnostics, applicable fault-code resets and checks to confirm the agreed work is complete.
We take payment, provide a receipt and explain the applicable software warranty.
02Why choose Fix My AdBlue
An AdBlue-related fault code can have several possible causes. Our technicians can assess the diagnostic information, check your vehicle and advise on the appropriate next steps.
Customer questions
Still unsure? Send us your registration and a photo of the warning on WhatsApp.
Ask on WhatsAppP20BA means "Reductant heater A control circuit performance". The control system has detected a problem with the AdBlue heater circuit. The code tells you where the problem was detected, not which part has failed.
AdBlue freezes at around -11°C, so the heaters work hardest in cold weather and a heater fault often shows up then. The circuit still needs checking to confirm the cause.
On some vehicles, yes. Many diesel vehicles start a countdown or limit performance when an AdBlue fault stays active, but the response depends on the manufacturer and model.
A full fault scan, live data and checks on the AdBlue heater circuit. We look at the whole report, because related codes often show where the problem really is.
Yes, subject to technician availability. We are mobile, so we come to your home or workplace. Send your registration, postcode and the fault code to check coverage.
Yes. Our standard hours are Monday to Sunday, 8 AM to 8 PM. Emergency callouts are available 24 hours a day, 7 days a week, subject to location and availability. An additional emergency callout charge applies and is confirmed before dispatch.
Tell us your vehicle registration, fault code and postcode. We'll check compatibility, discuss the available options and help you arrange an appointment.
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