Code
P02D9
Generic
P — Powertrain
Cylinder 7 Fuel Injector A Offset Learning At Max Limit
Views:
UK: 26
EN: 35
RU: 30
AI status
Completed
Completed
100%
Causes
- Faulty or clogged fuel injector on cylinder 7
- Injector electrical problem (open, short, high resistance, poor connector)
- Damaged wiring or poor ground to injector circuit
- Low or fluctuating fuel rail pressure or fuel delivery issue
- Cylinder mechanical problems (low compression, valve issues)
- Contamination in injector (carbon, varnish) or internal leakage
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Rough idle or vibration
- Misfire specifically on cylinder 7 (P0307 may be present)
- Reduced engine performance and hesitation under load
- Poor fuel economy
- Hard starting or increased crank time
What to check
- Read complete DTC list and freeze frame data; note fuel rail pressure and engine conditions when fault set
- Check for related codes (misfire, fuel pressure sensor, injector circuit codes)
- Inspect connector and wiring at cylinder 7 injector for corrosion, loose pins, or damage
- Measure injector resistance and compare to factory spec
- Scan for learned injector offset/adaptation values and observe if cylinder 7 is at limit
- Monitor short-term and long-term fuel trims and individual cylinder trim (if available)
Signal parameters
- Injector pulse width (commanded) vs actual (when available)
- PCM learned injector offset / correction value for cylinder 7
- Short-term and long-term fuel trims
- Cylinder-specific misfire counters (cyl 7)
- Fuel rail pressure and fuel pump demand
- Injector coil resistance (ohms)
Diagnostic algorithm
- Record all DTCs and freeze frame data. Note driving conditions and fuel rail pressure when the code stored.
- Clear codes and perform a controlled road test or IDLE test to see if P02D9 returns and to capture live data.
- Visually inspect the injector connector, wiring harness, and ground for cylinder 7. Repair any damage or corrosion.
- Compare injector coil resistance (cold) to specification. Replace if out of tolerance.
- With a noid light or oscilloscope, verify injector drive signal (pulse presence, duration, shape) while cranking/running.
- Check fuel rail pressure (static and under load) to ensure proper fuel supply. Repair fuel pump/regulator as needed.
- If wiring and fuel pressure are OK, swap the cylinder 7 injector with a known-good injector from another cylinder and see if the adaptation/limiting fault follows the injector after clearing codes.
- If fault follows injector, clean or replace the injector. If fault stays with cylinder, continue diagnosing wiring and PCM side circuits.
- Perform compression or cylinder leak-down test on cylinder 7 to rule out mechanical issues causing abnormal fueling correction.
- After repair or replacement, clear codes, perform relearn/adaptation procedure if required by manufacturer, then verify via test drive and re-scan.
- If problem persists, check for PCM software updates or consult manufacturer technical service information; consider PCM evaluation.
Likely causes
- Injector on cylinder 7 delivering incorrect flow (clogged, stuck, leaking)
- Poor electrical connection or high resistance in injector circuit for cylinder 7
- Fuel pressure out of specification affecting injector flow
Fault status
Status
Cylinder 7 injector A offset learning reached maximum limit—PCM unable to adapt. Inspect injector, wiring, fuel delivery, and cylinder condition.
Repair difficulty: Medium
Diagnostic time: 1.5 - 3.5 hours
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