P0267
Cylinder 3 Injector Circuit Low
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The P0267 code indicates the PCM has detected lower-than-expected voltage in the electrical circuit that controls the cylinder 3 fuel injector. This means there's an electrical fault preventing the injector from receiving its proper control signal, which can cause a misfire on cylinder 3 and overall rough engine operation.
As with other injector circuit low codes, the most common causes are straightforward electrical issues. Start by checking the connector at the cylinder 3 injector — wiggle it to check for looseness and inspect for corrosion on the pins. Then examine the wiring harness for signs of chafing, melting, or physical damage. On some vehicles, cylinder 3 injector wiring may run close to exhaust components, making it more susceptible to heat damage.
Measuring the injector coil resistance with a multimeter is a quick diagnostic step. If resistance is significantly below specification, the injector coil is shorted and the injector needs replacement. Individual fuel injectors are relatively affordable and accessible on most engines. If you're replacing one injector, consider having all injectors tested — if one has failed, others may be near the end of their service life as well.
Severity
Symptoms
- •Engine misfires or runs rough, especially at idle
- •Noticeable loss of power during acceleration
- •Check Engine Light is on or flashing
- •Poor fuel economy
- •Rough idle with possible engine stalling
Likely Causes
The connector at the cylinder 3 injector may be loose, corroded, or damaged from heat and vibration exposure. This is the most common cause of low-circuit conditions on fuel injectors.
Wiring between the PCM and the cylinder 3 injector can short to ground due to chafed insulation, heat exposure near the exhaust, or physical damage, pulling the circuit voltage below specification.
An internal short circuit in the cylinder 3 injector solenoid coil reduces its resistance below specification, causing excessive current draw that the PCM identifies as a low-circuit condition.
The PCM's internal driver circuit for cylinder 3 may be damaged or leaking current to ground, creating a false low-circuit reading even when the injector and wiring are functioning normally.
Estimated Cost
Professional Repair
Includes parts + labor
Common Fixes
- Clean and reseat the cylinder 3 fuel injector electrical connector
- Repair or replace damaged wiring in the injector circuit
- Replace the cylinder 3 fuel injector
- Test and verify the PCM injector driver output