P0208
Injector Circuit/Open - Cylinder 8
When a vehicle powertrain module registers the fault code P0208, it points directly to an internal system malfunction identified as "Injector Circuit/Open - Cylinder 8". Operating your engine under this condition may degrade long-term fuel maps.
Driver's Summary
Storing code P0208 is your car's way of telling you something is wrong with the injector circuit/open - cylinder 8. You may notice v8 engine runs rough, lacks power, flashing mil, all of which are direct consequences of this malfunction. Stop driving as soon as it is safe to do so. This fault can lead to expensive secondary damage if left unaddressed.
Symptoms
V8 engine runs rough, lacks power, flashing MIL
Common Causes
- Dead fuel injector Cylinder 8
- Open circuit in control wire
- Damaged harness from engine heat
- Internal PCM fault
How to Fix
- 1 Replace Cylinder 8 injector
- 2 Repair control wire
- 3 Reroute and repair harness
- 4 Reprogram or replace PCM
Technical Explanation
To set P0208, the PCM samples the affected circuit multiple times per second, comparing live readings against manufacturer-programmed operating windows. Misfire rate is counted per cylinder over rolling windows and compared against two thresholds: a catalyst-damaging rate (triggers flashing MIL) and an emissions-exceeding rate (triggers solid MIL). The PCM logs which cylinder is misfiring based on crankshaft position at the time of each detected event. Once confirmed, the code is stored as a permanent DTC and the MIL is activated. The freeze frame snapshot — recording RPM, load, coolant temperature, and fuel trim at fault detection — is also saved and is critical for accurate diagnosis.
Is It Safe to Drive?
An active P0208 code under high-severity conditions means the affected system is operating outside safe parameters. Continued driving — especially under load or at highway speeds — significantly increases the risk of secondary damage to components like open circuit in control wire.
Mechanic's Pro Tip
Before replacing any component on P0208, spend 5 minutes inspecting the wiring harness and connector first — corrosion, chafed insulation, and backed-out pins cause the majority of these faults and cost nothing to fix. Use a multimeter to measure voltage drop across the connector pins under load; anything above 0.1V indicates excessive resistance that will cause intermittent failures even after replacing the sensor.
Injector replacement: $200 - $450