What Does P02D8 Mean?
The ECM has detected that Cylinder 7 fuel injector offset learning correction has reached its minimum allowable limit. The adaptive strategy is subtracting the maximum fuel from Cylinder 7, but the over-fueling condition exceeds the correction range. This code applies to V8 and larger engines, indicating Cylinder 7 is delivering excess fuel that the ECM cannot compensate for through normal offset learning.
Common Causes
40%
Leaking or stuck-open Cylinder 7 fuel injector delivering excess fuel beyond adaptive correction capability
25%
Incorrect replacement injector installed in Cylinder 7 with a higher flow rate than the matched injector set
20%
Elevated fuel rail pressure on the bank feeding Cylinder 7 from a faulty pressure regulator or fuel pump
15%
Injector nozzle deposits on Cylinder 7 altering spray characteristics and increasing net fuel delivery
Diagnostic Steps
1
Step 1: Retrieve injector offset learning values for all cylinders. Confirm Cylinder 7 has the most negative offset, indicating the ECM is maximally reducing fuel to that cylinder.
2
Step 2: Monitor per-cylinder fuel contribution at idle and 2500 RPM. Compare Cylinder 7 behavior to other cylinders on the same bank to isolate the problem.
3
Step 3: Swap Cylinder 7 injector with an adjacent cylinder on the same fuel rail, clear adaptive values, and drive through a complete relearn cycle to determine if the fault follows the injector.
4
Step 4: Measure fuel rail pressure with a mechanical gauge on the bank feeding Cylinder 7. Verify pressure is within specification and stable across all operating conditions.
5
Step 5: If injector tests within flow specification, perform a compression test and cylinder leak-down test on Cylinder 7 to identify mechanical conditions affecting combustion.
Estimated Repair Cost
$150 - $650
Parts + labor, varies by vehicle and location
The ECM has detected that Cylinder 7 fuel injector offset learning correction has reached its minimum allowable limit. The adaptive strategy is subtracting the maximum fuel from Cylinder 7, but the over-fueling condition exceeds the correction range. This code applies to V8 and larger engines, indic...
The most common cause of P02D8 (Cylinder 7 Fuel Injector Offset Learning At Min Limit) is: Leaking or stuck-open Cylinder 7 fuel injector delivering excess fuel beyond adaptive correction capability
Typical repair costs for P02D8 range from $150 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Over-fueling on Cylinder 7 can damage the catalytic converter, wash cylinder walls, and increase tailpipe emissions. Prolonged operation risks catalyst overheating and potential engine damage.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P02D8 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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