P0202
Cylinder 2 Injector A Circuit
Fuel injector circuit
Generic OBD-II
High
What it means
P0202 means the ECM has detected an electrical fault in the control circuit for the cylinder 2 fuel injector. If the circuit opens, cylinder 2 stops firing and the engine misfires, runs rough, and loses power. The usual cause is a wiring or connector problem at the injector, or a failed injector itself.
High
Can I keep driving? Drive as little as possible — an electrical fault in the cylinder 2 injector circuit can kill that cylinder, causing a heavy misfire, rough running and possible stalling.
Common symptoms
What you'll notice
- Check-engine light on
- Misfire, rough idle, or shaking from a dead or weak cylinder 2
- Reduced power and hesitation on acceleration
- Rough running and, on some engines, stalling
Common causes
Most likely first
- Corroded, loose, or damaged connector at the cylinder 2 injector (most common)Likely
- Open or shorted wiring in the injector control circuitCommon
- Failed fuel injector (open or shorted coil)Common
- Faulty ECM injector driver (rare)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame and confirm the misfire/injector fault is on cylinder 2.
- Inspect the injector connector and wiring for corrosion, damage, or a break; wiggle-test while watching for a change.
- Measure the injector coil resistance against spec and compare with a known-good cylinder.
- Swap the suspect injector with a neighbouring one; if the fault follows, replace the injector.
- Verify the ECM is pulsing the injector before condemning the driver, then clear and re-test.
FAQ
Quick answers
Is it safe to drive with P0202?+
Keep it brief. A dead cylinder 2 means a heavy misfire that wastes fuel and can overheat the catalytic converter, so get it fixed promptly.
Can I just clear P0202?+
It returns as soon as the ECM sees the injector-circuit fault again. Repair the wiring or injector first, then clear it.
Related codes
Often seen with P0202
Read & clear P0202 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX