What Does P02DA Mean?
The ECM has detected that Cylinder 8 fuel injector offset learning correction has reached its minimum allowable limit. The adaptive fuel strategy is subtracting the maximum fuel from Cylinder 8, but the over-fueling condition exceeds the allowable correction range. This code applies to V8 and larger engines, indicating Cylinder 8 is delivering excess fuel that cannot be compensated through normal offset learning.
Common Causes
40%
Leaking or stuck-open Cylinder 8 fuel injector delivering excess fuel beyond the ECM adaptive correction window
25%
Mismatched or incorrect replacement injector at Cylinder 8 with a higher flow rate than the factory specification
20%
Elevated fuel rail pressure on the bank feeding Cylinder 8 from a malfunctioning pressure regulator
15%
Carbon deposits or varnish on Cylinder 8 injector nozzle increasing effective fuel delivery volume
Diagnostic Steps
1
Step 1: Review all cylinder injector offset learning values. Confirm Cylinder 8 shows the most negative offset, meaning the ECM is subtracting maximum fuel from that cylinder.
2
Step 2: Perform a cylinder power balance test and monitor per-cylinder fuel contribution data at idle and 2500 RPM to quantify the Cylinder 8 rich condition.
3
Step 3: Swap Cylinder 8 injector with an adjacent cylinder on the same bank, clear adaptations, and perform a complete relearn drive cycle to isolate the fault.
4
Step 4: Measure fuel rail pressure at idle and under load with a mechanical gauge. Verify the pressure regulator is maintaining correct pressure and not causing bank-wide over-pressurization.
5
Step 5: If the injector tests within flow specification, perform a compression and leak-down test on Cylinder 8 to check for mechanical conditions such as valve or ring sealing issues.
Estimated Repair Cost
$150 - $650
Parts + labor, varies by vehicle and location
The ECM has detected that Cylinder 8 fuel injector offset learning correction has reached its minimum allowable limit. The adaptive fuel strategy is subtracting the maximum fuel from Cylinder 8, but the over-fueling condition exceeds the allowable correction range. This code applies to V8 and larger...
The most common cause of P02DA (Cylinder 8 Fuel Injector Offset Learning At Min Limit) is: Leaking or stuck-open Cylinder 8 fuel injector delivering excess fuel beyond the ECM adaptive correction window
Typical repair costs for P02DA range from $150 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Persistent over-fueling on Cylinder 8 can wash cylinder walls, damage the catalytic converter from unburned hydrocarbons, and cause elevated emissions and reduced fuel economy.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P02DA to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel Injection System
Difficulty
Type
Generic (SAE)
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