P2037 to P2064: AdBlue (diesel exhaust fluid) injection system
A part of the system that injects AdBlue, also called diesel exhaust fluid or reductant, into the exhaust has a fault: an injector (unit 1 or 2 on bank 1 or 2), the reductant temperature sensor, the injection air pressure sensor, the air pump or the reductant supply.
SeverityModerateUsually not urgent today, but it can get worse if left.
Can you keep driving?Drive gently, check it soonWhat does P2037 mean?
Diesels with SCR catalysts spray AdBlue, a solution of urea in water, into the exhaust, where it turns the harmful nitrogen oxides into nitrogen and water. A pump, heaters, sensors and an injector deliver exactly the right amount. AdBlue freezes in the cold and leaves white crystals when it dries, so blocked injectors and lines are common. Emission rules require the car to warn the driver and, if the fault is not fixed, to block the engine from restarting once a countdown runs out.
What causes P2037?
- An empty, contaminated or diluted AdBlue tank
- AdBlue crystals blocking the injector or a supply line
- A failed AdBlue pump or heater, often in the tank unit
- A failed temperature or pressure sensor in the system
- A damaged wire or connector to the AdBlue pump or heater under the car
What to check first for P2037
- Check the AdBlue level and that only proper AdBlue has been added
- Look at the injector on the exhaust for white crystal buildup
- Note whether the car shows a countdown to a restart block
- Have the dosing test run with a scan tool to see whether the pump and injector deliver
Can you drive with P2037?
Usually you can drive to a workshop. Watch the countdown on the dash, and have the system repaired before it reaches zero, because the engine may then not restart until it is fixed.
Clear a code only after the fault is fixed. A code that comes back means the cause is still there, and a warning light left on can hide a second fault behind the first.
Codes on this page
28
- P2037Reductant Injection Air Pressure Sensor Circuit
- P2038Reductant Injection Air Pressure Sensor Circuit Range/Performance
- P2039Reductant Injection Air Pressure Sensor Circuit Low Input
- P2040Reductant Injection Air Pressure Sensor Circuit High Input
- P2041Reductant Injection Air Pressure Sensor Circuit Intermittent
- P2042Reductant Temperature Sensor Circuit
- P2043Reductant Temperature Sensor Circuit Range/Performance
- P2044Reductant Temperature Sensor Circuit Low Input
- P2045Reductant Temperature Sensor Circuit High Input
- P2046Reductant Temperature Sensor Circuit Intermittent
- P2047Reductant Injector Circuit/OpenBank 1 Unit 1
- P2048Reductant Injector Circuit LowBank 1 Unit 1
- P2049Reductant Injector Circuit HighBank 1 Unit 1
- P2050Reductant Injector Circuit/OpenBank 2 Unit 1
- P2051Reductant Injector Circuit LowBank 2 Unit 1
- P2052Reductant Injector Circuit HighBank 2 Unit 1
- P2053Reductant Injector Circuit/OpenBank 1 Unit 2
- P2054Reductant Injector Circuit LowBank 1 Unit 2
- P2055Reductant Injector Circuit HighBank 1 Unit 2
- P2056Reductant Injector Circuit/OpenBank 2 Unit 2
- P2057Reductant Injector Circuit LowBank 2 Unit 2
- P2058Reductant Injector Circuit HighBank 2 Unit 2
- P2059Reductant Injection Air Pump Control Circuit/Open
- P2060Reductant Injection Air Pump Control Circuit Low
- P2061Reductant Injection Air Pump Control Circuit High
- P2062Reductant Supply Control Circuit/Open
- P2063Reductant Supply Control Circuit Low
- P2064Reductant Supply Control Circuit High
Related codes
Checked on · Rafael Soares
These are the generic meanings every manufacturer shares. Each brand adds its own detail, so your car's handbook, its service information and a qualified mechanic have the last word. OdoKeep has no connection with any manufacturer, and the app does not read codes from the car.
