Skip the auto shop - Our mechanics make house calls

P2059 OBD-II Trouble Code: Reductant Injection Air Pump Control Circuit/Open

Check Engine Light

P2059 code definition

Reductant Injection Air Pump Control Circuit/Open

What the P2059 code means

P2059 is an OBD-II generic code indicating that the Engine Control Module (ECM) detects that the reductant injection air pump control circuit has an open in the circuit.

What causes the P2059 code?

  • The ECM controls the reductant injection air pump. The ECM can detect open circuits or high resistance in the control circuit and will turn on the Check Engine Light if it detects a fault.

  • A broken wire in the control circuit from the ECM to the reductant injector air pump.

What are the symptoms of the P2059 code?

  • The Check Engine Light will be illuminated and the code set in ECM memory as a fault.

  • The exhaust emission may be richer than expected.

  • The vehicle will fail any emission tests due to the Check Engine Light being on.

How does a mechanic diagnose the P2059 code?

  • Scans and documents the codes in the ECM; looks at the corresponding freeze frame data for failure

  • Checks the air pump wiring connections for problems with loose or corroded connections

  • Checks the air pump for the proper resistance

  • Follows the manufacturer pinpoint tests for the diagnosis and replacement of the reductant injector and air pump

Common mistakes when diagnosing the P2059 code?

  • Clearing ECM memory codes before checking the freeze frame data for the main failure problem, so the failure may be duplicated and repaired.

  • Failing to clear the ECM codes after the codes are fixed so the ECM will enable the system to normal again.

How serious is the P2059 code?

Code P2059 is a code that may not cause any drive complaints but will put on the Check Engine Light and cause a vehicle to fail an emission test.

What repairs can fix the P2059 code?

Additional comments for consideration regarding the P2059 code

Code P2059 is for an open circuit for the reductant injector air pump. This is a code only used by a couple of different manufacturers; meanings may be different from your vehicle than this article implies. Follow the pinpoint test for the vehicle you are working on to determine if your vehicle uses the reductant injection system. In some vehicles, this code is used for O2 sensor problems.

Need help with a P2059 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
P0222 OBD-II Trouble Code: Throttle/Pedal Position Switch/Sensor B Circuit Low Input
P0222 code definition Throttle/Pedal Position Switch/Sensor B Circuit Low Input What the P0222...
How to Buy Fuel Treatments
Adding a fuel additive to your gas tank when you fill up is one way to clean vital engine parts of deposits, improve the performance of your engine,...


Related questions

Q: Will not accelarate over 20mph and has a P0430 code

Hello and thank you for contacting Your Mechanic. The code P0430 means that the catalyst system efficiency is below threshold on bank 2. This is in relation to the catalytic converter not functioning correctly, but this code will not make...

Q: Always trying to figure out why warning lights are on, what’s actually wrong?

The first thing I would recommend is to have YourMechanic come to you since you cannot go over 40 mph and do a thorough diagnostic check for the issues you are having. The lights on the dash all have a...

Q: rough idle, heavy missing, fault codes P0301 and P0456. lack of power, where do i start to diagnose this?

Hi there. From the description you have provided, for the P0301 rough idle and heavy misfire and P0456 evaporative small leak detected, the problems are unrelated. The P0301 is a #1 cylinder misfire code. It could be, a spark plug...