Injector Circuit Malfunction - Cylinder 8
P0208 indicates the PCM detected a malfunction in the fuel injector circuit for cylinder 8, meaning the injector is not operating correctly or the circuit has an electrical fault. This causes improper fuel delivery to that cylinder, resulting in misfires and rough engine operation.
What You Might Notice
- Engine misfire on cylinder 8
- Rough idle and rough running engine
- Poor acceleration and reduced power
- Check Engine Light (MIL) illuminated
- Possible fuel smell from exhaust
Most Common Causes
- 1
Faulty fuel injector
The cylinder 8 injector is stuck open, stuck closed, or internally damaged, preventing proper fuel atomization and delivery.
- 2
Open wiring to injector
Broken or disconnected wiring in the fuel injector circuit for cylinder 8 prevents the PCM from powering the injector.
- 3
Short in injector circuit wiring
Damaged insulation or shorted wires in the cylinder 8 injector circuit cause electrical faults detected by the PCM.
- 4
Faulty PCM or driver module
A defective engine control module or injector driver circuit fails to properly control the cylinder 8 injector.
How to Diagnose It
- 1
Check Faulty fuel injector — The cylinder 8 injector is stuck open, stuck closed, or internally damaged, preventing proper fuel atomization and delivery.
- 2
Check Open wiring to injector — Broken or disconnected wiring in the fuel injector circuit for cylinder 8 prevents the PCM from powering the injector.
- 3
Check Short in injector circuit wiring — Damaged insulation or shorted wires in the cylinder 8 injector circuit cause electrical faults detected by the PCM.
- 4
Check Faulty PCM or driver module — A defective engine control module or injector driver circuit fails to properly control the cylinder 8 injector.
How to Fix It
- 1
Replace fuel injector
Remove and replace the cylinder 8 fuel injector with a new or remanufactured unit. Inspect the injector seat and clean if necessary before installation.
- 2
Inspect and repair wiring
Check the entire wiring harness and connectors for cylinder 8 injector for damage, corrosion, or loose connections. Repair or replace damaged wiring and ensure secure connections.
- 3
Clean fuel injector
If the injector is not faulty, use fuel injector cleaner or have the injector professionally cleaned to remove carbon deposits that may be blocking fuel flow.
- 4
Test and replace PCM if needed
After ruling out injector and wiring issues, test the PCM injector driver circuit using a scan tool or oscilloscope. Replace the PCM if it is unable to provide proper control signals to the injector.
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