P02D7

What it means

P02D7 means the engine control unit has found that the learned offset for the cylinder 6 fuel injector (circuit or bank A) has reached its maximum adjustment limit. The ECU trims each injector to match its actual delivery, and it saw that the correction needed is more than it is allowed to apply. This points to an injector delivering differently from its nominal value, or a fault that makes the injector or its supply behave abnormally. The exact learning method and the meaning of 'A' vary by engine and manufacturer.

Symptoms

• Engine management light on
• Rough idle or uneven running, especially when cold
• Misfire or hesitation on cylinder 6 under load
• Increased fuel consumption
• Hard starting or extended cranking
• Reduced power or the car entering limp mode

Possible causes

• Cylinder 6 fuel injector worn, sticking, leaking or partly blocked so its delivery is outside the correctable rangelikely
• Wiring or connector fault on the cylinder 6 injector circuit, such as high resistance, corrosion or a poor pin fitpossible
• Fuel pressure or fuel quality problem affecting delivery, such as a weak pump, a restricted filter, a pressure regulation fault or contaminated fuelpossible
• Mechanical fault on cylinder 6 that the ECU is trying to compensate for, such as low compression or an air leak at that runnerpossible
• Injector replaced or disturbed without the new correction values being coded or learned correctlypossible
• Fault in the injector driver within the ECU or an outdated ECU calibration, where the manufacturer has identified onerare

How to diagnose

1. Read all stored and pending codes and the freeze frame data, noting engine temperature, load and fuel trims when the fault set
2. Check for other related codes such as misfires, fuel pressure, injector circuit or lean/rich faults, and diagnose those first
3. Inspect the cylinder 6 injector connector and wiring for damage, corrosion, heat damage and a tight pin fit
4. Review live data for injector correction values on all cylinders and compare cylinder 6 with the others
5. Check fuel pressure against the manufacturer's specification at idle and under load, and inspect the fuel for contamination
6. Check for induction air leaks and carry out a compression or cylinder balance test if cylinder 6 is running poorly
7. Test the injector electrical resistance and waveform, and carry out a leak-down or flow comparison as the manufacturer specifies
8. Check for any manufacturer service bulletins or calibration updates for the engine in question

How to fix

• Replace the cylinder 6 injector if testing shows it is faulty, then code or learn the new correction value as the manufacturer requires
• Repair or replace damaged wiring or connectors on the injector circuit
• Correct fuel supply faults, such as replacing a restricted filter or repairing a faulty pump or pressure regulation, and drain and replace contaminated fuel
• Repair any mechanical fault or air leak affecting cylinder 6
• Apply a manufacturer calibration update only where an outdated calibration is a documented cause, then clear the code and road test to confirm it does not return

Can I keep driving?

Nearby codes

• P02D6GenericCylinder 6 Fuel Injector A Offset Learning At Min Limit
• P02D8GenericCylinder 7 Fuel Injector A Offset Learning At Min Limit