What Does P20CC Mean?
The exhaust aftertreatment fuel injector is not performing to expected parameters. The PCM detects that fuel delivery volume, timing, or spray pattern does not match commanded values, but no specific electrical fault exists.
Common Causes
35%
Clogged or partially restricted exhaust fuel injector nozzle
25%
Weak or failing injector with degraded internal components
20%
Low fuel pressure to aftertreatment injector from supply pump
15%
Carbon buildup on injector tip restricting spray pattern
5%
Faulty injector control module or driver circuit in PCM
Diagnostic Steps
1
Step 1: Monitor live data for commanded vs actual injector duty cycle and fuel delivery volume during regeneration event
2
Step 2: Check fuel supply pressure to aftertreatment injector and compare to specifications (typically 40-80 psi)
3
Step 3: Remove and visually inspect injector for carbon buildup, clogging, or physical damage to nozzle
4
Step 4: Test injector operation using bidirectional controls or injector test bench if available
5
Step 5: Check for fuel quality issues or contamination that may cause injector fouling
Estimated Repair Cost
$300 - $1,800
Parts + labor, varies by vehicle and location
The exhaust aftertreatment fuel injector is not performing to expected parameters. The PCM detects that fuel delivery volume, timing, or spray pattern does not match commanded values, but no specific electrical fault exists.
The most common cause of P20CC (Exhaust Aftertreatment Fuel Injector "A" Control Performance) is: Clogged or partially restricted exhaust fuel injector nozzle
Typical repair costs for P20CC range from $300 to $1,800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive temporarily but will prevent successful DPF regeneration. Extended driving without repair will cause DPF clogging and eventual engine power reduction.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P20CC to identify the root cause.
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Quick Info
Category
Powertrain
System
Emissions Control - Diesel Particulate Filter Regeneration
Difficulty
Type
Generic (SAE)
Recommended Tools
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