P0294 OBD-II Trouble Code: Cylinder 12 Injector Circuit Low

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

SCHEDULE P0294 DIAGNOSTIC Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0294 code

P0294 is a diagnostic trouble code (DTC) for "Cylinder 12 Injector Circuit Low". 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 P0294 DIAGNOSTIC Get a fair and transparent estimate upfront

P0294 code definition

P0294 is the universal OBD-II code for Cylinder 12 Injector Circuit Low.

What the P0294 code means

The fuel injector’s job is to deliver the right mixture of fuel and air to the engine. If this mixture is off balance, such as when there is a malfunction in the injector or its circuitry, the oxygen sensor sends a message to the PCM telling it that there is a lean mixture. Trouble code P0294 means that the number 12 cylinder in the firing order is experiencing either reduced or non-existent fuel delivery.

If the PCM gets the signal that there is a lean mixture in one of the cylinders, it automatically sends a message to the other cylinders telling them to deliver a richer fuel mixture. This series of events can impact multiple vehicle systems.

What causes the P0294 code?

Possible causes of this fault code may include:

  • A bad fuel injector
  • A clogged or dirty fuel injector
  • A short or open in the fuel injector wiring or harness
  • A malfunction in the PCM’s fuel injector driver
  • A damaged or loose connector at the fuel injector

What are the symptoms of the P0294 code?

Likely signs of this fault include an illuminated Check Engine Light, reduced power, and decreased fuel economy. In addition, you may notice the engine running rough.

How does a mechanic diagnose the P0294 code?

The technician may take the following steps to diagnose this issue:

  • Verify any set codes using a scanner, recording the freeze frame data and clearing the codes to see if they return

  • Visually inspect the fuel injector connectors and wiring

  • Observe the cylinder number 12 fuel injector while the engine is running to check for a faint clicking sound (to indicate normal function)

  • Test the resistance and voltage of the fuel injector connector

  • Testing the harness connector terminals

  • Remove the fuel injector from the engine in order to visually observe the fuel spray

Common mistakes when diagnosing the P0294 code

A common error when trying to identify a cylinder 12 fuel injector problem is to replace the PCM without fully inspecting all other involved components. PCM failure is rare, so performing the full diagnostic procedure is vital to making an accurate diagnosis.

How serious is the P0294 code?

While a cylinder 12 fuel injector malfunction will not prevent the vehicle from running, the problem can affect the way the entire engine runs, compromising fuel economy and causing the engine to run rough. It’s wise to have this issue addressed by a professional as soon as possible.

What repairs can fix the P0294 code?

The following solutions may be required for this issue:

Most fuel injector problems are the result of corrosion in the connectors or wiring, a bad injector, or a clogged injector.

Additional comments for consideration regarding the P0294 code

There are fuel injector flushing kits available for home use, in case you want to try cleaning it out yourself, however the correct procedure must be followed. The fuel return line must be plugged so that the cleaner does not travel back to the fuel tank.

If you want to listen to the fuel injector to make sure it’s functioning (as evidenced by a clicking noise), hold a screwdriver tip to the injector with the handle at your ear. This helps to amplify the sound so that you can hear it more easily.

If all attempts at home repair fail, don’t hesitate to contact a trained technician. Engine problems can spiral out of control quickly if not properly repaired, so a P0294 code is something you want to attend to as soon as possible in order to prevent more serious damage.

Need help with a P0294 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 1-800-701-6220.

trouble codes
Check Engine Light
P0294

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

SCHEDULE P0294 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

4,810

Rating Summary
4,424
187
47
28
124
4,424
187
47
28
124

Joel

19 years of experience
741 reviews
Joel
19 years of experience
Acura RL - Check Engine Light is on - Jacksonville, Florida
very knowledgeable and precise. able to fix electrical issues in my car. Right on time for the appointment.

Christopher

15 years of experience
41 reviews
Christopher
15 years of experience
Honda Accord - Check Engine Light is on - Fairburn, Georgia
Christopher was excellent! He explained everything in detail to make sure I understood. He was professional and provided me with the next course of actions to resolve my care issues. I'm glad he was sent to service my car.

Alexander

18 years of experience
58 reviews
Alexander
18 years of experience
Saab 9-7x - Check Engine Light is on - Kissimmee, Florida
He was very friendly and very helpful . I felt like it was being around a close friend , also gave me so very good advice on my car & future advice about it . Highly recommend mechanic, would use his services again .

Matthew

31 years of experience
639 reviews
Matthew
31 years of experience
Jeep Patriot - Check Engine Light is on - Norfolk, Virginia
Matthew was on time which was a relief, he is very knowledgeable and was easy to understand what was wrong and what was being done. I am recommending to friends and family due to the great experience Matthew gave me. Extremely professional 10/10

More related articles

P0390 OBD-II Trouble Code: Camshaft Position Sensor “B” Circuit (Bank 2)
Trouble code P0390 means the PCM does not detect the camshaft position sensor B signal and is very similar to trouble code P0345.
P0342 OBD-II Trouble Code: Camshaft Position Sensor Circuit Low Input
P0342 means that the camshaft position sensor circuit on engine bank 1 is sending a reading that is outside the manufacturer's settings.
P0797 OBD-II Trouble Code: Pressure Control Solenoid C Stuck On
P0797 means that there is a problem in one of the electronic pressure control solenoids or circuits due to a faulty solenoid, or low or dirty fluid.

Related questions

Emission control leak.

This code may be caused by the canister purge solenoid is leaking or you did not tighten the gas cap. Either way the leak should be cleared first and do a physical inspection of the fuel system. Then to check...

2002 duramax went into limp mode after fluid ad filter change

Hello, I can help you with this! When doing a transmission service for this vehicle, you will set a (DTC) trouble code for a low pressure condition with transmission. This is a normal condition when replacing the filter and fluid....

My engine light came on approximately 10 months ago. I had a diagnostic test ran on it. It stated that I needed a TCM.

Hi there, thanks for writing in. The traction control module is a part of the ECM, but usually is a separate component from the main control module. The best way to solve the issue is to have a professional mechanic...

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