P0272 DTC Code


The P0272 Diagnostic Trouble Code (DTC) is a generic powertrain code that appears when there is a malfunction in cylinder 4 injector circuit and the Engine Control Module (ECM) detects an inconsistency in the injector’s electrical signal. This code specifically indicates that the ECM has detected a low voltage condition in the fuel injector circuit for cylinder 4.

Symptoms of P0272 DTC Code

When the P0272 DTC code is triggered, you may experience the following symptoms:

  • Engine misfire in cylinder 4
  • Reduced engine power
  • Decreased fuel efficiency
  • Rough idling
  • Illuminated Check Engine Light

Causes of P0272 DTC Code

The P0272 code can be caused by various factors. Some of the common causes include:

  1. Faulty fuel injector: A faulty fuel injector can cause a low voltage condition, leading to the triggering of the P0272 code.
  2. Wiring issues: Problems with the wiring harness connected to the fuel injector can cause electrical signals to be disrupted, resulting in the code.
  3. ECM malfunction: If the ECM is not functioning properly, it may misinterpret signals from the fuel injector and trigger the P0272 DTC.

Trouble Code Diagnosis

To diagnose and repair the P0272 DTC, follow these steps:

1. Scan for other codes

First, use an OBD-II scanner to check if any other codes are present. Dealing with other codes might help determine the root cause of the P0272 code.

2. Inspect the fuel injector

Inspect the fuel injector for any signs of damage or clogging. A visual inspection can help identify a faulty injector that needs replacement.

3. Check the wiring harness

Examine the wiring harness connected to the fuel injector. Look for any signs of electrical damage, loose connections, or corrosion. Repair or replace any damaged wires or connectors.

4. Test the fuel injector resistance

Measure the resistance of the fuel injector using a multimeter. Compare the obtained reading with the manufacturer’s specifications. If the resistance is out of range, replace the injector.

5. Inspect the ECM

Check the ECM for any signs of damage or water intrusion. An ECM malfunction can cause erroneous low voltage readings. If necessary, replace or reprogram the ECM.

6. Clear the code

After addressing the underlying issue, clear the P0272 code with an OBD-II scanner. This will reset the Check Engine Light.

Frequently Asked Questions (FAQs)

Q: Can I continue driving my vehicle with the P0272 code?

A: It is not recommended to continue driving your vehicle when the P0272 code is triggered. This code signifies a fault in cylinder 4 injector, which can lead to engine misfires and decreased performance. It is advisable to have the issue diagnosed and repaired as soon as possible to prevent further damage.

Q: How much does it cost to fix the P0272 DTC code?

A: The cost of repairing the P0272 code can vary depending on the root cause, vehicle make/model, and the labor rates of your local mechanic. In general, the cost can range from $100 to $500, including parts and labor.

Q: How can I prevent the P0272 trouble code from recurring?

A: To prevent the recurrence of the P0272 code, ensure regular maintenance of your vehicle, including scheduled fuel injector cleaning and inspections. Avoid using low-quality fuel, as it can contribute to injector issues. Additionally, promptly address any engine-related trouble codes to prevent further damage to components.

In conclusion, the P0272 DTC code indicates a low voltage condition in the fuel injector circuit for cylinder 4. It is crucial to diagnose and repair the underlying issue promptly to prevent engine misfires and reduced performance. Follow the diagnostic steps and consider seeking professional help if needed. Regular maintenance and care can also aid in preventing the recurrence of this trouble code in the future.

About author


Meet Sam Mitchell, your experienced and reliable guide in the complex world of car fault codes. With a robust career spanning over 15 years as a professional car mechanic, John has the skills, knowledge, and practical experience to help you navigate car fault issues with confidence.


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