What Does P20CE Mean?
The PCM has detected abnormally high voltage in the exhaust aftertreatment fuel injector control circuit. This indicates a short to voltage or an open ground circuit preventing proper injector operation.
Common Causes
35%
Open ground circuit or poor ground connection for injector
25%
Wiring harness short to voltage (rubbed through to power wire)
20%
Failed exhaust fuel injector with internal open circuit
15%
Corroded or damaged injector connector causing high resistance
5%
PCM injector driver circuit failure stuck high
Diagnostic Steps
1
Step 1: Check ground circuit continuity from injector ground pin to chassis ground (should be less than 1 ohm)
2
Step 2: Disconnect injector and measure voltage on control wire with key on; should show battery voltage or controlled ground signal
3
Step 3: Inspect injector connector for corrosion, bent pins, or damage that could cause high resistance
4
Step 4: Measure injector coil resistance with connector disconnected (typically 2-10 ohms); infinite resistance indicates open coil
5
Step 5: Check for damaged wiring that may be contacting battery voltage sources along harness routing
Estimated Repair Cost
$150 - $1,600
Parts + labor, varies by vehicle and location
The PCM has detected abnormally high voltage in the exhaust aftertreatment fuel injector control circuit. This indicates a short to voltage or an open ground circuit preventing proper injector operation.
The most common cause of P20CE (Exhaust Aftertreatment Fuel Injector "A" Control Circuit High) is: Open ground circuit or poor ground connection for injector
Typical repair costs for P20CE range from $150 to $1,600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe for short-term driving but prevents DPF regeneration from functioning properly. Prolonged neglect will result in DPF restriction and eventual engine power limitation.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P20CE 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
OBD2 Scanner
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