P02D2
Cylinder 4 Fuel Injector A Offset Learning At Min Limit
Fuel injection / injector control
Generic OBD-II
High
What it means
P02D2 means the ECM's learned fuel-injection correction for cylinder 4's injector has reached its minimum allowed limit — it can no longer trim that injector any further to keep delivery balanced. This often points to an injector that's drifted out of spec (or needs its calibration code re-entered), or a fault in the injector control-module wiring. The engine usually keeps running but may feel slightly rough.
High
Can I keep driving? Usually drivable — the ECM's fuel-trim learning for cylinder 4 has hit its limit; the engine may run slightly rough but keeps running.
Common symptoms
What you'll notice
- Check-engine light on (often the only obvious sign)
- Slightly rough running or reduced power from cylinder 4
- Possible faint misfire under load
Common causes
Most likely first
- Cylinder 4 injector out of specification or needing re-coding/replacementLikely
- Open or shorted wiring in the injector control-module circuitCommon
- Poor electrical connection at the injector control module (FICM) or injectorCommon
- Faulty fuel injector control module (FICM)Less often
- Weak module supply voltage or a poor groundLess often
How to diagnose & fix
Work through it in order
- Scan and read freeze-frame data, then review cylinder 4's injector correction/offset values.
- Inspect the injector control module wiring and connectors for opens, shorts, and corrosion.
- Verify the control module's supply voltage and ground circuits are solid.
- Test or replace the cylinder 4 injector and enter its calibration code if the vehicle requires one.
- Only after wiring and injector check out, consider the control module. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P02D2?+
Usually yes for short trips, but the injector correction is at its limit and running quality may suffer. Have it checked soon.
Can I just clear P02D2?+
It returns until the underlying injector, wiring, or calibration issue on cylinder 4 is corrected.
Related codes
Often seen with P02D2
Read & clear P02D2 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