P02D1
Cylinder 3 Fuel Injector A Offset Learning At Max Limit
Fuel injectors
Generic OBD-II
High
What it means
P02D1 means the ECM's learned fuel-offset correction for the cylinder 3 injector has reached its maximum limit — it can no longer trim enough to compensate for that injector's drift. This usually points to a worn injector, missing or wrong calibration codes after an injector swap, or a wiring/control-module fault. Left alone, it tends to progress into rough running or a misfire.
High
Can I keep driving? Usually still drivable with the light on, but the injector is drifting out of calibration, so running and emissions can suffer — have it checked before it worsens.
Common symptoms
What you'll notice
- Check-engine light on
- Often no strong driving symptom early on
- Rough idle, slight power loss, or a cylinder-3 misfire as it worsens
- Faint smoke or a knock (diesel)
Common causes
Most likely first
- Worn or out-of-calibration cylinder 3 injectorLikely
- Incorrect or missing injector calibration codes after a swapCommon
- Wiring or connector fault to the injector or its control moduleCommon
- Faulty fuel injector control module (FICM)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and check for cylinder-3 misfire or contribution codes.
- Verify the injector's calibration/coding is correctly programmed for that cylinder.
- Inspect the injector and control-module wiring, connectors, and grounds.
- Test and, if needed, replace the cylinder 3 injector, then reprogram its codes.
- Clear the code and re-test.
FAQ
Quick answers
Is it safe to drive with P02D1?+
In the short term, usually yes, but the ECM has run out of room to correct for this injector, so performance and emissions will slowly degrade. Have it diagnosed before it turns into a misfire.
Can I just clear P02D1?+
It returns once the ECM relearns and again hits the limit. The injector or its calibration needs attention, not just a code clear.
Related codes
Often seen with P02D1
Read & clear P02D1 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