OBD-II trouble code
P0264: Cylinder 2 Injector Circuit Low
SAE J2012 APR2002: cylinder 2 injector circuit low. On the 2009 Pontiac G3 that is injector 2's control open or shorted to ground. The printed pair is one injector.
Quick facts
- System
- Powertrain
- Category
- Fuel Injectors
- Severity
- Medium severity
- Drivable
- Usually safe to drive short-term
- Repair cost range
- $768 – $953 (one fuel injector replacement, parts and labor, RepairPal national average updated 3 September 2026; cylinder 2 wiring, the LY7 bank feed, and the ECM are outside this pair)
- DIY difficulty
- Shop recommended
Browse every code in P0200–P0299, or start from the full code library.
What does P0264 mean?
SAE J2012 APR2002 names P0264 Cylinder 2 Injector Circuit Low. The cylinder digit is not a location. The numbering diagram says which injector is 2. Circuit low is measured with that injector connected. P0265 is cylinder 2 circuit high. P0261 is cylinder 1's low code and is the wrong connector.
The 2009 Pontiac G3 fault table gives injector 2 its own row. A short to ground sets P0264 and P0300. An open or high resistance sets P0264 and P0300. A short to voltage sets P0265 and P0300. Ignition voltage feeds the injector. The ECM grounds the control circuit. Low-side switching means the short-to-ground test is on the control leg, terminal 1 on this chart, not on the ignition feed at terminal 2. The feed has its own lamp: terminal 2 to ground, key on, injector unplugged. No light repairs that feed for a short to ground or an open, and replaces the fuse if it opened. A dark feed lamp does not prove the control wire is shorted.
J 34730-405 between terminal 1 and terminal 2 should flash with the engine running. Always on: short to ground on the control wire, and the ECM only if the wire tests normal. Always off: short to voltage or open, which is the chart's shared sentence, while P0264's descriptor remains open or short to ground. Write the result you measured. Resistance is 11–14 ohms between terminal 2 and terminal 1, ignition off, unplugged, coolant 10–32°C (50–90°F). Those terminal numbers are the G3 injector connector. They are not cylinder 1's harness once you have moved to the wrong plug, and they are not the LY7 multi-way.
On the 3.6L LY7 low-voltage chart, P0264 sets together with P0270 and P0276 when that bank's ignition feed is shorted to ground. One P0264 by itself, on that chart, goes to the single control wire. Three together go to the shared feed. Disconnecting the LY7 multi-way sets the open-circuit injector codes, which that procedure tells you to expect. Do not treat those opens as the original fault.
RepairPal's injector replacement removes the intake on the engines it describes. Depressurize first. Disconnect the battery before fuel is opened. That page says the replacement is not a DIY repair.
Common causes
- On the G3 table, injector 2 control shorted to ground, filed as P0264 and P0300
- On that table, an open in injector 2's control, also filed as P0264 and P0300
- A dead ignition feed at terminal 2, which is a feed short or a feed open, not the control wire
- An always-on test lamp followed by an ECM replacement before the control wire's short-to-ground test
- A coil outside 11–14 ohms at 10–32°C on cylinder 2's connector
- P0264 with P0270 and P0276 on the LY7 chart, which is that bank's shared feed
- Cylinder 1's connector, which stores P0261 when it is the low fault
Symptoms
- P0264 stored
- P0300 stored with it on the G3 open and short-to-ground rows
- A test lamp that will not light at cylinder 2 terminal 2
- An injector lamp that stays on while cylinder 2 is commanded
- P0265 stored if the control is shorted to voltage instead
Diagnostic steps
- 1.Number the cylinders before anything is unplugged. Cylinder 2 is not the G3's cylinder 1 connector and not 'the front plug' unless the diagram says so.
- 2.Ignition off, unplug injector 2. Ignition on. Lamp from terminal 2 to ground. No light: feed short to ground or feed open, fuse if it opened. Do not jump from a dark feed lamp to the control wire.
- 3.Ignition off. J 34730-405 from terminal 1 to terminal 2. Engine running, the lamp flashes or it does not. Stay clear of the belt and the fan.
- 4.Always on: short-to-ground test of injector 2's control, both ends off, ignition off. ECM only if the wire is normal. Always off: short to voltage or open, as two tests. P0264's G3 descriptor is the open or the short to ground.
- 5.11–14 ohms, terminal 2 to terminal 1, coolant 10–32°C, ignition off. Replace injector 2 if the ohms are outside that and the circuits already passed. Do not ohm it at operating temperature; the G3 says the window is 10–32°C.
- 6.If the LY7 trio P0264, P0270, and P0276 is stored, test the shared ignition feed for a short to ground before three injectors are ordered. Expect open-circuit codes when that multi-way is disconnected.
- 7.Depressurize, battery disconnected, before the injector is removed. The dollar pair is one injector. The wire, the fuse, and the ECM are outside it.
- 8.Verify engine running, ignition voltage still inside 11–16 volts, P0264 not returning.
Repair cost
$768 – $953 (one fuel injector replacement, parts and labor, RepairPal national average updated 3 September 2026; cylinder 2 wiring, the LY7 bank feed, and the ECM are outside this pair)
RepairPal's fuel injector replacement, updated 3 September 2026, is $768–$953 (labor $304–$446, parts $464–$507). The printed pair is that national average for one injector, which is the part the G3 replaces when injector 2's circuits test normal and the coil is outside 11–14 ohms. Cylinder 2's access is not given a separate line on that national average. Other vehicle lines on the estimator are outside the pair. Wiring, a fuse, the LY7 shared feed, and an ECM are outside it. Diagnosis is $125–$183 labor and is separate.
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DIY vs shop
Leave this one to a qualified shop. The barrier here is high-pressure fuel components, where residual pressure remains after shutdown and escaping fuel can penetrate skin. DIY attempts often produce a more expensive problem than the original code.