What Does P02D5 Mean?
The ECM has detected that Cylinder 5 fuel injector offset learning correction has reached its maximum allowable limit. The PCM is adding the maximum fuel to Cylinder 5 but cannot compensate for the under-fueling condition. Cylinder 5 is delivering significantly less fuel than commanded, typically indicating a restricted or failing injector on a V6, V8, or inline-5 engine.
Common Causes
40%
Partially clogged Cylinder 5 fuel injector with internal deposits or debris restricting fuel flow
25%
Failing Cylinder 5 injector solenoid with increased coil resistance reducing pintle travel and fuel volume
20%
Low fuel rail pressure on Bank 2 from a degraded fuel pump or restricted fuel supply line
15%
Vacuum leak at Cylinder 5 intake runner or gasket introducing unmetered air and creating a localized lean condition
Diagnostic Steps
1
Step 1: Review injector offset learning values for all cylinders. Confirm Cylinder 5 has the most positive offset, indicating the ECM is adding maximum fuel to compensate for under-delivery.
2
Step 2: Perform an injector flow bench test comparing Cylinder 5 output to the other injectors. Flow deviation greater than 5% from the set average indicates a restricted injector.
3
Step 3: Swap Cylinder 5 injector with an adjacent cylinder on the same bank, clear adaptations, and complete a relearn drive cycle. If the lean bias follows the injector, replace or ultrasonically clean it.
4
Step 4: Smoke test the intake manifold area around Cylinder 5 for vacuum leaks. On V-engines, check the valley gasket area and any crossover passages.
5
Step 5: Verify fuel rail pressure and pump volume on the bank feeding Cylinder 5. Ensure pressure is within specification at idle and under wide-open throttle load.
Estimated Repair Cost
$150 - $650
Parts + labor, varies by vehicle and location
The ECM has detected that Cylinder 5 fuel injector offset learning correction has reached its maximum allowable limit. The PCM is adding the maximum fuel to Cylinder 5 but cannot compensate for the under-fueling condition. Cylinder 5 is delivering significantly less fuel than commanded, typically in...
The most common cause of P02D5 (Cylinder 5 Fuel Injector Offset Learning At Max Limit) is: Partially clogged Cylinder 5 fuel injector with internal deposits or debris restricting fuel flow
Typical repair costs for P02D5 range from $150 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Under-fueling Cylinder 5 causes lean misfires, elevated exhaust temperatures, and potential catalytic converter damage. Drivability symptoms include rough running and loss of power.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P02D5 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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