Skip the auto shop - Our mechanics make house calls

P0270 OBD-II Trouble Code: Cylinder 4 Injector Circuit Low

Check Engine Light

P0270 code definition

Cylinder 4 Injector Circuit Low

What the P0270 code means

This diagnostic trouble code indicates that the powertrain control module has detected a lower reference voltage from the fuel injector on the number 4 cylinder than what was specified by the vehicle manufacturer.

What are the causes of the P0270 code?

  • The wiring or connector that is associated with the fuel injector on the number 4 cylinder has been damaged in some way.

  • The internal return spring inside the fuel injector on the number 4 cylinder may not be performing properly.

  • The powertrain control module could be malfunctioning.

What are the symptoms of the P0270 code?

How does a mechanic diagnose the P0270 code?

  • The first step a mechanic would take would be to locate the fuel injector on the number 4 cylinder. This may require the removal of a plastic engine cover in order to gain access.

  • The mechanic would then test the fuel injector using the service information provided by the manufacturer for proper function.

  • Next, the mechanic would ensure that the wiring and connector associated with the fuel injector on the number 4 cylinder are in good condition.

If the cause of this trouble code has not been discovered after these two tests have been performed:

  • The mechanic would then test the powertrain control module for faults using a high tech scan tool.

When a mechanic takes the time to go through all the proper steps necessary to diagnose an issue such as this one, the customer will be able to make a much more informed repair decision.

Common mistakes when diagnosing the P0270 code

A common mistake would be to test the wrong fuel injector. To prevent this from happening, it is imperative that an engine diagram is used that shows the correct cylinder order. Testing the wrong fuel injector can lead to misdiagnosis, wasted time, and wasted money.

How serious is the P0270 code?

Considering that this trouble code can cause the engine to misfire and therefore run poorly, this code would be considered serious. It is not in the best interest of the engine to drive for long periods of time with a misfire; it can cause damage to the catalytic converters as well as the engine. For best results, have this issue diagnosed and repaired at the earliest possible moment.

What repairs can fix the P0270 code?

  • Repairing or replacing wiring or connectors that are associated with the fuel injector on the number 4 cylinder.

  • Replacing the fuel injector that is associated with the number 4 cylinder.

  • Replacing the powertrain control module

Additional comments regarding the P0270 code

Wildlife such as rats, squirrels, chipmunks, and even birds can nest up under your engine cover or in other areas of the engine bay. These animals will oftentimes chew on the insulation that covers the wiring for important electrical components of the vehicle. The fuel injectors are very vulnerable to this sort of damage due to their location. Checking for evidence of wildlife during this inspection is a great idea.

Need help with a P0270 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

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
The Traveler’s Guide to Driving in Malaysia
CraigBurrows / Shutterstock.com Malaysia is a popular destination for many tourists today. The country has amazing sights and attractions that you will want to explore....
P2159 OBD-II Trouble Code: Vehicle Speed Sensor B Range/Performance
Diagnostic Trouble Code (DTC): P2159 P2159 code definition Vehicle Speed Sensor B Range/Performance Related Trouble Codes: P2158: Vehicle Speed Sensor B P2160: Vehicle Speed Sensor B Circuit Low P2161:...


Related questions

Q: Car won't let me accelerate.

Hello there, A continued oxygen sensor and voltage code is a sign there is still a problem with your 2002 Pontiac Firebird. You did not say if you replaced the oxygen sensor in question or not. I am going to...

Q: Check engine Light appears

Hello. The P0440 code you are getting is for an EVAP system problem. This code is generic so the system needs to be checked. Most of the time it is because of a system leak such as a fuel cap...

Q: How long and what is the process to replace a fuel pressure sensor?

A professional mechanic would require roughly 5 hours. (If just the regulator is replaced that takes about 1 hour). Some parts, as noted below, cannot be re-used, you need a precision inch pound torque wrench, FSM instructions (and TSB updates...