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P2051 is a diagnostic trouble code (DTC) for "Reductant Injector Circuit Low Bank 1 Unit 1". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
Reductant injector circuit low bank 1 unit 1
This trouble code indicates that the powertrain control module has noticed a malfunction with the reductant injector air circuit.
Some potential causes of this trouble code would include:
The symptoms that the driver with this trouble code may experience would be occasional black smoke coming from the tailpipe and the Check Engine Light being illuminated.
A visual inspection of the exhaust system to check the injector air sensor and its wiring would be a wise place for a mechanic to start. If the issue is not found, the mechanic would then ensure that the vehicle has the correct exhaust system and that no leaks exist.
Once this has been confirmed, if the problem still exists, the powertrain control module would be tested using the manufacturer’s recommended procedure. Any malfunctioning parts that were found during this inspection would be noted and relayed to the customer to make a repair decision.
A common mistake that could be made during the diagnosis of this issue would be to replace parts without properly testing them. This mistake can apply to any Check Engine Light diagnosis. Most manufacturers offer a diagnostic procedure for all Check Engine Light codes, so it is important to follow these procedures.
Considering that this trouble code does not cause any drivability issues, I would consider this to be low on the seriousness scale. Though, it would be unpleasant to have people behind you getting angry all the time due to the excess emissions from your car. Just like with any Check Engine Light, it is best to resolve the problem as soon as possible.
Repairs that can fix this trouble code would include:
Repairing or replacing wiring that is in the exhaust temperature/pressure circuit
Replacing the exhaust temperature/pressure sensor
Replacing an aftermarket exhaust system with an exhaust system that meets the manufacturer’s specifications
Repairing a large exhaust leak upstream of the exhaust temperature/pressure sensor
When this trouble code is stored on your vehicle, be sure to run the engine in well ventilated areas as much as possible due to the excess gasses that come out of the tailpipe and pollute the air.
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