Skip the auto shop - Our mechanics make house calls

P0263 OBD-II Trouble Code: Cylinder Number 1 Contribution/Balance Fault

Check Engine Light

P0263 code definition

Cylinder Number 1 Contribution/Balance Fault

What the P0263 code means

P0263 is an [OBD-II diagnostic trouble code] which indicates that the engine control module (ECM) detected the cylinder number 1 having low contribution to the running of the engine; low power.

What causes the P0263 code?

  • The number one cylinder injector is not spraying in enough fuel or no fuel at all.

  • The number one injector is open or shorted electrically (other trouble codes would be present).

  • The fuel pressure is low or has low volume due to a clogged fuel filter or defective pump.

  • The compression in number 1 cylinder is low due to rockers, lifters, cam, rings or cylinder head gasket problems.

  • The injector O-ring is leaking compression.

What are the symptoms of the P0263 code?

How does a mechanic diagnose the P0263 code?

  • Scans codes and documents the freeze frame data in order to verify the problem.

  • Clears the engine and ETC codes to verify whether the concern comes back

  • Runs an injector electrical self test

  • Checks the fuel pressure and volume to specifications

  • Performs a crankcase pressure test

  • Checks cylinder compression and repairs as needed

  • Checks the injector O-rings and seals then replaces the injector if needed

Common mistakes when diagnosing the P0263 code?

  • Failing to verify the code returns after scanning and deleting code
  • Failing to check fuel pressure volume during diagnosis before replacing injector

How serious is the P0263 code?

A misfiring cylinder can cause the engine to run lean on the failed cylinder if it is an injector and cause the engine to blow black smoke if it has low compression in the cylinder.

What repairs can fix the P0263 code?

  • Replacing the injector and injector seals
  • Replacing the fuel filter and fuel pump
  • Repairing the engine for low compression in the cylinder

Additional comments for consideration regarding the P0263 code

Code P0263 is triggered when the crankshaft sensor does not get an acceleration of the crankshaft from cylinder number 1 power stroke indicating that the cylinder is not contributing to engine power. The injector could also be shorted or open and will cause additional codes that would go with the code P0263 pointing to the injection failure.

Need help with a P0263 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

How Long Does a Throttle Return Spring Last?
Not all vehicles on the road feature an electronic throttle control (ETC), which is also called drive-by-wire. For vehicles that don't offer this system, they have a throttle cable instead that...
Symptoms of a Bad or Failing Flexible Clutch Hose
Common signs include difficulty shifting, low clutch fluid, and feeling no resistance at the clutch pedal.
P0121 OBD-II Trouble Code: TPS "A" Circuit Range Performance Problem
P0121 code definition Throttle Pedal Position Sensor/Switch (TPS) A Circuit Range Performance Problem...


Related questions

Q: what causes a P0174 bank2 combustion too lean

You will need to have the system inspected thoroughly to see why the vehicle is going lean. The possible causes are that you are loosing fuel pressure or fuel volume. If fuel pressure gets too low it will cause the...

Q: Check Engine Light with code P0740

There are a number of symptoms that may accompany a P0740 code, it may be that your car will stall at stop lights, or have trouble shifting, or you may not notice anything at all except your gas mileage is...

Q: My truck runs for about 20 minutes and then dies. After few minutes starts back up. Changed fuel pump and few other things

Try cleaning the mass air flow sensor as these sometimes get dirty which can cause it to not run well or at all in some cases. Without additional detail as to what else has been changed, it is tough to...