P2054 OBD-II Trouble Code: Reductant Injector Circuit Low Bank 1 Unit 2

Our certified mechanics come to you · 12-month, 12,000-mile warranty

SCHEDULE P2054 DIAGNOSTIC Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

Cost of diagnosing the P2054 code

P2054 is a diagnostic trouble code (DTC) for "Reductant Injector Circuit Low Bank 1 Unit 2". 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.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$20.00
Toyota$20.00
BMW$20.00
SCHEDULE P2054 DIAGNOSTIC Get a fair and transparent estimate upfront

P2054 trouble code definition

Reductant Injector Circuit Low Bank 1 Unit 2

What the P2054 code means

This code indicates a problem with the circuit that controls the reductant injector. The terms “circuit low” refers to a lower than expected voltage in the reductant control circuit. This injector injects DEF (Diesel Exhaust Fluid) into the exhaust stream of a diesel motor to reduce the emissions of NOx (Oxides of Nitrogen, aka Nitrogen Oxide).

What causes the P2054 code?

The most likely cause of this code is a shorted reductant injector. The wiring harness to the reductant injector should be inspected closely, being under the vehicle and attached to the hot exhaust system, the possibility of damage is something that should be considered.

What are the symptoms of the P2054 code?

  • Higher than normal NOx emissions
  • Check engine light
  • Though this system should not affect the smooth running of the vehicle, there are reports that some systems are designed to affect the way the system runs. For what reason it is still unclear, as these systems are new to the diesel emissions market.

How does a mechanic diagnose the P2054 code?

  • A technician should first connect a scanner to the vehicle for monitoring and to command on the DEF system.

  • After it has been confirmed that the system isn’t operating as expected, a multimeter should be used to test the resistance of the injector solenoid.

  • If the solenoid resistance is within spec, power and ground should be applied to the solenoid to test it further.

  • If nothing is found wrong with the injector solenoid, the wiring harness should be thoroughly inspected visually and if necessary, continuity of the wiring harness from the PCM to the solenoid should be checked.

  • If everything checks out to this point, the reductant injector should be removed from the exhaust system and checked for clogging, as DEF is corrosive and is a common problem with this system. Although it should be noted this code is designed to detect a fault in the electrical part of this system.

Common mistakes when diagnosing the P2054 code

  • Failure to inspect the wiring harness and connector thoroughly.

  • Failure to confirm the PCM is able to command the system on.

  • Failure to remove and inspect the nozzle for clogging. This code is an indicator of the condition of the electrical circuit, but a clogged reductant injector can cause the sensor to read incorrectly.

How serious is the P2054 code?

Other than contributing to global warming, because the system isn’t working properly, this system in of itself doesn’t affect the vehicle at all. There are reports that some vehicles exhibit drivability issues when this system is failing.

These systems are new to diesel technology, so much is unknown about how each manufacturer's programming will affect the smooth running of the vehicle. Outside of the programming choices the manufactures make when integrating the DEF system into the exhaust stream of a vehicle, this system has no adverse effects on the vehicle.

What repairs can fix the P2054 code?

  • Replacing the reductant injector
  • Repairing wiring to the injector
  • Replacing the PCM (uncommon)

Additional comments for consideration regarding the P2054 code

This code isn’t very common. There are several other codes used by different manufacturers to test this system in the same fashion. The codes numbers all seem to fall into the P2xxx category and differ per manufacturer. Regardless the procedures and operational dynamics are consistent from vehicle to vehicle and utilize the same engineering designs across the board.

Without a doubt, the most common failure is the reductant injector itself. This injector injects a corrosive solution into the exhaust stream that tends to corrode and clog the injector nozzle. The manufacturer’s are still working out the most effective methods of implementing this system design to reduce the emission of NOx. As with any new system to the consumer market, it will take time for the auto industry to discover the lowest maintenance design. Until then, this system is a common thorn in the side of anyone who owns a newer diesel vehicle.

Need help with a P2054 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.

P2054
trouble codes
Check Engine Light

Fast and easy Check Engine Light is on Inspection service at your home or office.

SCHEDULE P2054 DIAGNOSTIC
Get a fair and transparent estimate upfront

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.8/5

Number of Reviews

4,860

Rating Summary
4,473
187
48
28
124
4,473
187
48
28
124

Albert

13 years of experience
22 reviews
Albert
13 years of experience
Ford Fusion - Check Engine Light is on - Riverside, California
Albert showed up early, was very professional and informative, would definitely recommend to family and friends

William

15 years of experience
9 reviews
William
15 years of experience
Ford Crown Victoria - Check Engine Light is on - Denver, Colorado
William was such a great help on helping me not only diagnose my vehicle but also helped me better understand my own Car! Such a great experience for my first time using Your Mechanic

Joseph

25 years of experience
498 reviews
Joseph
25 years of experience
Chevrolet Camaro - Check Engine Light is on - Katy, Texas
Joseph was early for my appointment! He explained everything that was easy for me to understand! I would highly recommend Joseph and Yourmechanic to everyone I know! Thanks, Joseph!

Omar

10 years of experience
279 reviews
Omar
10 years of experience
Toyota Camry - Check Engine Light is on - Fort Lauderdale, Florida
Omar arrived right on time. He was thorough in running through all of the points of the inspection, and when he found the cause of the check engine light, he explained it in detail. Thankfully, it was a minor issue and easy remedy. He noticed a few things that I needed to pay attention to and sent me an estimate for them. He was friendly, polite, and knowledgeable. I would recommend him highly.

More related articles

B1905 OBD-II Trouble Code: Air Bag Crash Sensor #2 Feed/Return Circuit Short to Battery
B1905 means there is a circuit error with the airbag crash sensor #2, likely due to a bad sensor or defective electrical components.
P0825 OBD-II Trouble Code: Gear Lever Push-Pull Switch (Switch Anticipate)
P0825 means there is a circuit issue with the gear lever push-pull switch, likely due to a damaged switch or defective electrical components.
P0721 OBD-II Trouble Code: Output Speed Sensor Range/Performance
P0721 code means the transmission control module (TCM) isn't properly converting incoming pulse signals often due too poor, wiring or sensor.

Related questions

My car want accelerate and my engine light is constantly blinking on and off

Hello. A misfire under load is typically caused by a problem in the secondary ignition system (i.e. plugs, wires, coil pack). This will also cause your Check Engine Light to flash. The powertrain control module (PCM) directly controls coil operation,...

Code p0128

Your vehicle does not have a coolant sensor and uses the cylinder head temperature sensor to do both jobs. The system uses this sensor to sense both the coolant and head temperature. If your vehicle fan is running all the...

Car refuses to drive once dash lights turn on.

I would have a second opinion by a different mechanic to confirm. The Check Engine Light and Coolant Light may be an indication of another problem, and the computer may go into a failure mode and will limit throttle and...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1-800-701-6230 · hi@yourmechanic.com