Cylinder 4 Fuel Injector A Offset Learning At Min Limit
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.
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.
Real-world scan data
Appears alongside · share of P02D2 scans
Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.
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?+
Can I just clear P02D2?+
Related codes
Read & clear P02D2 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.