Open or damaged wiring in the injector circuit (broken wire, corroded connector, or chafed harness); Failed fuel injector with an open internal coil; Loose or corroded electrical connector at the injector; Faulty PCM driver for that injector circuit (rare but possible); Rodent damage or water intrusion affecting the injector harness

DTC codes / P02xx · Fuel and air metering (injector circuits) / P0210

P0210Injector Circuit/Open - Cylinder 10

Q: What does code P0210 mean?

Injector Circuit/Open - Cylinder 10. P0210 indicates that the powertrain control module (PCM) has detected an open circuit or excessive resistance in the fuel injector circuit for cylinder 10, meaning the electrical path to that injector is broken or compromised. The PCM monitors injector circuit voltage and current; when the expected electrical load is absent, it sets this code and may disable the injector to protect the driver circuitry.

P0210 indicates that the powertrain control module (PCM) has detected an open circuit or excessive resistance in the fuel injector circuit for cylinder 10, meaning the electrical path to that injector is broken or compromised. The PCM monitors injector circuit voltage and current; when the expected electrical load is absent, it sets this code and may disable the injector to protect the driver circuitry.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering (injector circuits)

Symptoms you may notice

Rough idle or misfire, especially noticeable at low speeds
Engine hesitation or stumble during acceleration
Reduced power and poor fuel economy
Check engine light illuminated, often flashing if the misfire is severe
Often no symptoms besides the warning light, particularly if the misfire is subtle at higher RPMs

Common causes, most likely first

Open or damaged wiring in the injector circuit (broken wire, corroded connector, or chafed harness)
Failed fuel injector with an open internal coil
Loose or corroded electrical connector at the injector
Faulty PCM driver for that injector circuit (rare but possible)
Rodent damage or water intrusion affecting the injector harness

How to diagnose and fix it

Perform a visual inspection of the injector harness and connector for damage, corrosion, or looseness
Use a noid light or test light to check for injector pulse at the connector while cranking the engine
Measure the resistance of the injector with a multimeter and compare to the manufacturer's specification
Check continuity and resistance of the wiring between the PCM and the injector, looking for opens or shorts
If the injector coil is open, replace the faulty injector
If wiring is damaged, repair or replace the affected section of the harness
Clear the code and verify the repair with a test drive, ensuring the injector circuit operates correctly

Don't overlook the injector harness

A common mistake is replacing the injector without first checking the wiring; a simple continuity test can save unnecessary parts replacement.
The code can be set by a poor connection at the injector connector that looks fine visually but has high resistance when warm.
On some vehicles, a failed injector on one cylinder can cause the PCM to shut down the entire bank, leading to multiple codes and misleading symptoms.
Rodent damage to injector wiring is more common than many technicians expect, especially in vehicles parked outdoors for extended periods.
P0210 can sometimes be caused by a faulty PCM driver, but this should only be suspected after all wiring and injector tests have passed.

Can I keep driving with P0210?

Driving with P0210 is generally not recommended because the misfire can damage the catalytic converter over time and reduce engine performance. If the check engine light is flashing, stop driving immediately and seek repair; otherwise, drive cautiously to a repair shop, avoiding heavy loads and high speeds.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.