P02D1

Cylinder 3 Fuel Injector A Offset Learning At Max Limit

Q: 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.

Q: 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.

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.

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 P02D1 scans

P02CDin 74.7% of scans

P02CFin 73.7% of scans

P02D3in 73.7% 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
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.

Read & clear P02D1 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