What Does P02CE Mean?
The ECM has detected that Cylinder 2 fuel injector offset learning correction has reached its minimum allowable limit. The PCM is subtracting the maximum permissible fuel quantity from Cylinder 2 to balance inter-cylinder fueling, but the needed correction exceeds the adaptive range. Cylinder 2 is delivering more fuel than commanded, indicating an injector that flows too richly or a mechanical condition causing over-fueling.
Common Causes
40%
Leaking or stuck-open Cylinder 2 fuel injector delivering excess fuel beyond the ECM adaptive correction capability
25%
Mismatched or incorrect replacement fuel injector installed in Cylinder 2 with higher flow rate than specification
20%
Elevated fuel rail pressure from a failing pressure regulator causing disproportionate over-delivery at Cylinder 2
15%
Injector tip deposits or carbon buildup on Cylinder 2 injector altering spray pattern and volumetric flow
Diagnostic Steps
1
Step 1: Review fuel injector offset learning values for all cylinders using a bidirectional scan tool. Identify whether Cylinder 2 shows the most negative correction compared to other cylinders, confirming it is over-fueling.
2
Step 2: Perform a cylinder power balance test and monitor individual cylinder fuel trim contributions at idle and 2500 RPM to quantify Cylinder 2 imbalance.
3
Step 3: Swap the Cylinder 2 fuel injector with a known-good cylinder. Clear adaptive values and perform a relearn drive cycle. If the code follows the injector, it confirms a faulty injector requiring replacement.
4
Step 4: Verify fuel rail pressure is within manufacturer specification using a mechanical gauge. Check for pressure regulator leakage by inspecting vacuum line for fuel contamination (port injection systems).
5
Step 5: If the injector tests within specification, perform a compression and leak-down test on Cylinder 2 to rule out mechanical causes such as valve sealing issues that could affect combustion and skew offset learning.
Estimated Repair Cost
$150 - $600
Parts + labor, varies by vehicle and location
The ECM has detected that Cylinder 2 fuel injector offset learning correction has reached its minimum allowable limit. The PCM is subtracting the maximum permissible fuel quantity from Cylinder 2 to balance inter-cylinder fueling, but the needed correction exceeds the adaptive range. Cylinder 2 is d...
The most common cause of P02CE (Cylinder 2 Fuel Injector Offset Learning At Min Limit) is: Leaking or stuck-open Cylinder 2 fuel injector delivering excess fuel beyond the ECM adaptive correction capability
Typical repair costs for P02CE range from $150 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Persistent over-fueling on Cylinder 2 can wash cylinder walls reducing lubrication, damage the catalytic converter from excess unburned hydrocarbons, and cause elevated emissions.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P02CE 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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