P02D3

Cylinder 4 Fuel Injector A Offset Learning At Max Limit

Q: Is it safe to drive with P02D3?

Short-term yes, but the ECM can no longer trim cylinder 4's fueling correctly, so the engine may run rough. Get it repaired before it worsens.

Q: Can I just clear P02D3?

It returns once the learned offset hits its limit again. This reflects a real injector or circuit fault, not a passing glitch.

Fuel injection Generic OBD-II High

What it means

P02D3 means the ECM's learned fueling offset for the cylinder 4 injector has reached its maximum limit — the computer can no longer compensate for how that injector is behaving. It usually points to a worn or faulty injector, or a wiring/control-module fault, causing rough running until the injector or circuit is repaired.

High

Can I keep driving? Usually driveable, but the injector fueling on cylinder 4 is off; expect rough running and fix it before it worsens or fouls the cylinder.

Real-world scan data

Seen in

scans in the past year

Found in

<0.1%

of scans

<0.1%

of scans that found faults

Appears alongside · share of P02D3 scans

P02D1in 82.3% of scans

P0191in 78.8% of scans

P02CFin 78.8% of 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
Rough idle or uneven running
Hesitation or reduced power
Possible knock or a slight misfire on cylinder 4

Common causes

Most likely first

Worn or faulty cylinder 4 fuel injector (out of its learnable range)Likely
Damaged wiring or a corroded connector at the injectorCommon
Poor connection or fault in the injector control module (FICM) supply/groundCommon
Fuel-pressure or fuel-quality issue affecting injector characterizationLess often

How to diagnose & fix

Work through it in order

Read freeze-frame data and inspect the cylinder 4 injector wiring and connector.
Check the injector control module's supply voltage and ground circuits.
Test the injector against spec and compare to the other cylinders.
Replace the worn injector and, where required, re-code/re-learn injector offsets. Clear and re-test.

FAQ

Quick answers

Is it safe to drive with P02D3?+

Short-term yes, but the ECM can no longer trim cylinder 4's fueling correctly, so the engine may run rough. Get it repaired before it worsens.

Can I just clear P02D3?+

It returns once the learned offset hits its limit again. This reflects a real injector or circuit fault, not a passing glitch.

Read & clear P02D3 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX