P1278
PPowertrainCylinder 8 Injector High to Low Side Open
What does this code mean?
Severity : HighP1278 reports an open circuit between the high side (supply) and low side (control) of the cylinder 8 injector. The module sees no current flowing in this injector circuit, so the injector cannot fire. This is a manufacturer-specific code: the exact meaning depends on the manufacturer.
Symptoms
- Check engine light on.
- Misfires and a shaking engine.
- Loss of power.
- Possible hard start.
Possible causes
- Open coil in the cylinder 8 injector.
- Unplugged or corroded injector connector.
- Broken wire in the injector harness.
- Damaged harness under the valve cover, depending on the engine.
- Faulty driver stage in the control module.
Diagnosis and repair
- Inspect the cylinder 8 injector connector and wiring.
- Measure injector resistance with a multimeter and compare with other cylinders.
- Check wire continuity between the module and the injector.
- Repair the wiring or replace the injector, then program its coding if required.
- Clear the code and road test.
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Code
P1278
Category
Powertrain
Prefix
P
Standard
OBD-II / SAE J2012