What Does P02D6 Mean?
The ECM has detected that Cylinder 6 fuel injector offset learning correction has reached its minimum allowable limit. The adaptive strategy is subtracting the maximum fuel from Cylinder 6, but the over-fueling exceeds the correction range. Cylinder 6 is delivering more fuel than commanded, commonly seen on V6 and V8 engines where this is typically the last cylinder on Bank 2.
Common Causes
40%
Leaking or stuck-open Cylinder 6 fuel injector delivering excess fuel beyond the ECM adaptive learning range
25%
Mismatched replacement injector installed in Cylinder 6 with a flow rate higher than the other injectors in the set
20%
Elevated fuel rail pressure from a faulty pressure regulator causing disproportionate over-delivery at Cylinder 6
15%
Carbon deposits or varnish on Cylinder 6 injector nozzle altering spray pattern and increasing effective fuel delivery
Diagnostic Steps
1
Step 1: Retrieve injector offset learning values for all cylinders. Confirm Cylinder 6 has the most negative correction, indicating maximum fuel subtraction by the ECM.
2
Step 2: Monitor cylinder-specific fuel contribution and short-term fuel trims at idle and 2500 RPM to quantify the Cylinder 6 rich bias.
3
Step 3: Swap Cylinder 6 injector with an adjacent cylinder on the same bank. Clear adaptations and perform a relearn drive cycle to determine if the fault follows the injector.
4
Step 4: Measure fuel rail pressure at idle and under load. On systems with returnless fuel rails, verify the fuel pressure sensor reading matches a mechanical gauge.
5
Step 5: If injector tests within specification, perform a compression and leak-down test on Cylinder 6 to check for mechanical conditions that could affect combustion efficiency.
Estimated Repair Cost
$150 - $600
Parts + labor, varies by vehicle and location
The ECM has detected that Cylinder 6 fuel injector offset learning correction has reached its minimum allowable limit. The adaptive strategy is subtracting the maximum fuel from Cylinder 6, but the over-fueling exceeds the correction range. Cylinder 6 is delivering more fuel than commanded, commonly...
The most common cause of P02D6 (Cylinder 6 Fuel Injector Offset Learning At Min Limit) is: Leaking or stuck-open Cylinder 6 fuel injector delivering excess fuel beyond the ECM adaptive learning range
Typical repair costs for P02D6 range from $150 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Over-fueling Cylinder 6 can cause catalytic converter damage from excess unburned hydrocarbons, cylinder wall washing, and elevated tailpipe emissions.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P02D6 to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel Injection System
Difficulty
Type
Generic (SAE)
Recommended Tools
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