What Does P20DA Mean?
The PCM detects voltage on the aftertreatment fuel injector control circuit is higher than expected. This electrical fault prevents proper injector control and fuel delivery.
Common Causes
35%
Open circuit in injector ground or control wiring
30%
Corroded or disconnected connector at injector
25%
Failed aftertreatment fuel injector with open coil
8%
Shorted to voltage wiring in control circuit
2%
PCM driver circuit failure
Diagnostic Steps
1
Step 1: Check voltage at injector connector with key on, should show battery voltage on power supply
2
Step 2: Verify ground circuit continuity from injector to PCM or chassis ground
3
Step 3: Inspect all connectors for looseness, corrosion, or pushed-out terminals
4
Step 4: Measure injector coil resistance for open circuit condition
5
Step 5: Test for short to voltage using DVOM on control circuit with injector disconnected
Estimated Repair Cost
$200 - $1,200
Parts + labor, varies by vehicle and location
The PCM detects voltage on the aftertreatment fuel injector control circuit is higher than expected. This electrical fault prevents proper injector control and fuel delivery.
The most common cause of P20DA (Exhaust Aftertreatment Fuel Supply Control Circuit High) is: Open circuit in injector ground or control wiring
Typical repair costs for P20DA range from $200 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle may enter limp mode with reduced power output. Failure to repair can result in DPF clogging and expensive aftertreatment system damage.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P20DA to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
Emissions Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
