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An injector circuit code points to wiring or a driver fault. Cylinder 8 only exists on V6, V8, or larger engines - this code won't appear on inline-4s. Swap the injector connector with an adjacent cylinder; if the code follows the connector, you've found a wiring or PCM driver issue. See top-rated scanners on Amazon ↑
🗺️ Where Is the Problem?
Blueprint view - P0208 fault localized to cylinder #8 injector circuit (wiring or driver)
These are statistical causes across ALL vehicles - your exact car may rank differently
For example, on a Honda 4-cyl the downstream O2 sensor causes P0208 64% of the time, but on a GM 5.3L V8 the catalytic converter is the cause 71% of the time. Get a probability ranking built specifically for your year, make, model, and mileage.
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🎯 Top Causes & Probability
50%
#1 - Most Likely
Broken or Chafed Injector Wire (Cylinder 8)
A broken, corroded, or chafed wire between the injector and the PCM is the most common cause. Cylinder 8 sits at the back of V8/V6 engines, where harnesses get heat-baked and brittle. Inspect for chewed insulation, melted boots, or pulled-out pins.
🔩 Part
$5–$25
👨🔧 Labor
$60–$180
⚡ DIY Difficulty
Medium
30%
#2 - Check First
Failed Fuel Injector (Cylinder 8)
The injector solenoid coil has burned open internally. A multimeter check across the injector terminals will show infinite resistance instead of the normal 12–16 ohms. Replacement injector for one cylinder is straightforward but the part can be pricey.
🔩 Part
$40–$250
👨🔧 Labor
$80–$200
⚡ DIY Difficulty
Medium
20%
#3 - Less Common
Failed PCM Injector Driver
The transistor inside the engine computer that fires this specific injector has failed. This is rare but does happen on older PCMs. Confirm by swapping the connector to a known-good cylinder - if the code now follows the wiring back to the same PCM pin, the driver is bad.
🔩 Part
$200–$700
👨🔧 Labor
$100–$300
⚡ DIY Difficulty
Hard
🚗 Most Affected Vehicles
🔧 Step-by-Step Diagnosis
- Check the injector connector at cylinder 8 - pop off the connector and inspect for green corrosion, bent pins, or melted plastic. Re-seat firmly; clear the code and rescan.
- Resistance test the injector - with key off, measure across the injector's two terminals. Expect 12–16 ohms on most engines. Infinite resistance = blown injector coil.
- Voltage test the harness - key on, engine off, backprobe the connector. One pin should show 12V from the relay. No 12V means a broken supply wire upstream.
- Swap connectors with an adjacent cylinder - if the code moves to the other cylinder, the injector is bad. If P0204 stays, the wiring or PCM is the issue.
- Inspect the harness along its run - cylinder 8 wires often run along hot manifolds. Look for melted insulation or rubbed-through spots near brackets.
📍 Find a Trusted Shop Near You
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Tips for Choosing a Shop
- Ask if they charge a diagnostic fee and whether it applies toward the repair
- Request a written estimate before approving any work
- Ask specifically about the part brand - OEM vs. aftermarket matters for this code
- Check Google reviews for recent mentions of the specific repair you need