P02D4

Cylinder 5 Fuel Injector A Offset Learning At Min Limit

Q: Is it safe to drive with P02D4?

Usually yes for short trips — it's a fuel-injector learning limit, not a no-start. But a drifting injector can worsen, so have it diagnosed.

Q: Can I just clear P02D4?

It returns once the offset again hits its minimum limit. The injector or its control circuit needs correcting first.

Fuel injector control Generic OBD-II High

What it means

P02D4 means the module's learned fuel-offset correction for the cylinder-5 injector has hit its minimum allowed limit — it can't trim the injector any lower to keep it balanced with the others. This usually points to a worn injector, a wiring/connection issue, or a control-module supply problem. Often the check-engine light is the main symptom, though the cylinder may run slightly rough.

High

Can I keep driving? Often the only sign is the warning light, though cylinder 5 may run slightly rough; the engine keeps running, but have the injector and its control circuit checked.

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 P02D4 scans

P009Ain 100.0% of scans

P0116in 100.0% of scans

P0128in 100.0% 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
Slightly rough idle or minor power loss (may be unnoticeable)
Cylinder-5 injector balance/contribution fault logged
Occasional hesitation

Common causes

Most likely first

Worn or out-of-tolerance injector on cylinder 5 needing more correction than allowedLikely
Poor connection or open/shorted wiring at the injector control circuitCommon
Faulty injector control module (FICM) supply or groundCommon
Injector deposits or fuel-quality issues skewing the learned offsetLess often

How to diagnose & fix

Work through it in order

Read freeze-frame data and review the cylinder-5 injector offset/balance values.
Inspect the injector connector and wiring for a poor connection, open, or short.
Check the injector control module (FICM) supply voltage and ground circuits.
Test the cylinder-5 injector against the others; clean or replace it if out of tolerance.
Clear the learned values and re-run the relearn, then re-test.

FAQ

Quick answers

Is it safe to drive with P02D4?+

Usually yes for short trips — it's a fuel-injector learning limit, not a no-start. But a drifting injector can worsen, so have it diagnosed.

Can I just clear P02D4?+

It returns once the offset again hits its minimum limit. The injector or its control circuit needs correcting first.

Read & clear P02D4 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