P0210 code: Injector Circuit/Open - Cylinder 10
P0210 means injector Circuit/Open - Cylinder 10. The code says where to look, not what failed — the fix depends on which cause your car actually has.
What P0210 means
The engine computer sets P0210 when the electrical circuit for the cylinder 10 fuel injector reads open, shorted, or outside the expected resistance range as the injector is pulsed. Since only V10 and V12 engines have a cylinder 10, this code is limited to those vehicles — typically heavy-duty trucks, certain vans, and high-end performance or luxury cars. Remember that this is a circuit code: it points to electricity not reaching or returning from the injector properly, which is a different failure from a clogged nozzle. Check the injector's connector first for corrosion or looseness, then the harness for chafed or heat-hardened wiring — long V-engine harnesses give wires plenty of places to rub — and finally the injector's internal winding. A failed injector driver in the computer is possible but rare. The paired misfire code is P0310, and the two often set together.
P0210 symptoms
- Cylinder 10 misfire, commonly stored with P0310
- Mildly rough idle — large engines partially mask a single dead cylinder
- Loss of power and refinement, especially under load
- Check-engine light, which may flash while misfiring
- Occasionally harder starting
What it costs to fix P0210
Typical range: $100–$600 · about ~0.5–2 hrs of labor
| If the cause is… | Part | Labor |
|---|---|---|
| Fuel injector (single) | $50–$300 | ~0.5–2 hrs |
| Wiring / connector repair | $10–$60 | ~0.5–1.5 hrs |
Only V10 and V12 engines carry a cylinder 10, and on several of them the injectors hide beneath intake plumbing that must come off, raising labor. These figures assume common gasoline injectors — diesel V10 injectors and exotic performance parts run far higher.
The price swings on which cause it turns out to be — so confirm the cause before paying. Diagnose P0210 for my exact vehicle →
How to fix P0210
Advanced — usually a shop job unless you’re well equipped
- Pin down cylinder 10 on a V10 or larger
Only V10, V12, and W12 engines have a tenth cylinder. On a V10 it is the highest-numbered cylinder, typically at the back of the engine; on a twelve its spot depends on whether the maker numbers bank by bank or alternates. Confirm on a diagram — the injectors look identical and a mislabelled wire costs hours.
- Inspect the connector clip and terminal seal
On long-service engines, injector plugs are often brittle enough that the latch snaps when pressed. Have a replacement pigtail ready before unplugging the cylinder 10 injector, and check the rubber seal and terminals for corrosion pushed in by water and engine-bay washing.
- Verify the pulse without risking the driver
On a port-injected engine, a noid light at the cylinder 10 plug while cranking shows whether power and the switching signal arrive. Many twelve-cylinder and some ten-cylinder engines are direct-injected, though, with high-voltage injector circuits — check the injection type first and follow the service manual's test instead of probing.
- Measure injector 10 and its control wire
Read the winding resistance and compare it to the rest of that bank, then use a wiring diagram to check the control wire's continuity to the engine computer. A good injector on an open wire narrows the fault to the harness run; a bad winding means the injector itself.
- Clear and confirm with a full drive
After the repair, clear the codes and drive through a full warm-up with some load. Big engines hide a dead cylinder well, so watch the cylinder 10 misfire counter rather than trusting the feel, and make sure P0310 does not reappear alongside.
DIY or shop? On some V10 trucks the injector plugs are reachable once a cover or the air intake ducting is off, and the testing steps are standard multimeter work. Twelve-cylinder cars are a different story: tight packaging, direct injection on many, and costly model-specific parts make injector replacement and harness repair a specialist job. Whatever the engine, an engine-computer fault should be confirmed and programmed by a shop.
Tools for the DIY steps: Noid light (port injection only) · Digital multimeter · Replacement injector connector pigtail · Wiring diagram · Scan tool with misfire counters
Not sure which step applies to your car? Get the likely cause for your exact vehicle before buying anything for P0210.
Start a case with P0210 and your car. Redline weighs these causes against what your car shows, and names the check that would settle it before you buy parts.
Can I drive with P0210?
Redline can’t determine from a symptom or code alone whether your car is safe to drive.
P0210: common questions
My scan tool shows P0210 but my car is a V6 — how?
A V6 has no cylinder 10, so a genuine P0210 shouldn't be possible. Suspect a misread, a code copied from another vehicle's session, or a glitch — clear it and re-scan. If it returns on an engine without ten cylinders, have the computer and tool checked.
How do I confirm whether the injector itself failed?
Unplug the cylinder 10 injector and measure resistance across its terminals, comparing with a neighboring injector — the values should be nearly identical. An open or badly mismatched reading means replace the injector; a normal one shifts the hunt to the connector, wiring, or computer.
Is P0210 safe to ignore for a while?
No — even if the engine feels smooth, a continuously misfiring cylinder sends raw fuel into the catalytic converter, and converter replacement on V10/V12 vehicles is a major bill. Deferring the repair for weeks is how that bill happens, and a flashing light means stop driving.
What should I budget for the fix?
Wiring or connector repairs are cheap. A single injector is a moderate part plus half an hour to two hours of labor, with the high end applying when intake components must come off for access — common on the large V engines this code lives on.
Related trouble codes
Don’t have a scanner yet? A ~$25 Bluetooth adapter reads codes like P0210 from your phone. See our guide to the best OBD2 Bluetooth adapters. Run a repair shop? See Redline for shops.
Generic OBD-II reference. Manufacturer-specific behavior varies. Confirm with a scan tool and, for safety-related codes, a professional inspection. Cost ranges are reference ranges, not quotes.
Seeing P0210 on your car?
Every problem becomes a Case. Tell Redline what the car is doing: it shows what the evidence supports, what’s still missing, and what to check next, before you approve a repair.
“Inner pad ~1 mm. Outer pad 3 mm.”
Next: check the slide pins move freely before buying parts.