P20DA: Exhaust Aftertreatment Fuel Supply Control Circuit High

Severity

Medium

System

Powertrain

Last reviewed: Jan 1, 0001 Last updated: Jan 1, 0001

Methodology: We combine code standards with complaint and reliability patterns, then review for clear, vehicle-first diagnosis steps.

Sources: SAE/OBD-II definitions, manufacturer service information, and public reliability reports (including NHTSA where applicable).

Limits: Guidance is informational and may not match every model-year or revision. Confirm with the official manual and diagnostics before replacing parts. For safety-critical or electrical work, use a qualified technician.

What Does P20DA Mean?

P20DA is a diagnostic trouble code indicating: Exhaust Aftertreatment Fuel Supply Control Circuit High. This code relates to the powertrain system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of P20DA

⚠️ Check Engine Light (MIL) illuminated
⚠️ Exhaust Aftertreatment Fuel Supply reading stuck at maximum value
⚠️ Related system operating erratically or in default mode
⚠️ Reduced engine performance

Common Causes

🔍 Short to voltage in Exhaust Aftertreatment Fuel Supply wiring harness
🔍 Corroded or water-damaged Exhaust Aftertreatment Fuel Supply connector
🔍 Faulty Exhaust Aftertreatment Fuel Supply outputting maximum voltage
🔍 Damaged wiring rubbing against metal components
🔍 ECM/PCM internal fault (rare)

Frequently Asked Questions

What does P20DA mean?

P20DA indicates: Exhaust Aftertreatment Fuel Supply Control Circuit High. The vehicle's computer has detected that the Exhaust Aftertreatment Fuel Supply is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P20DA?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P20DA for extended periods may cause additional problems.

How much does it cost to fix P20DA?

Repair costs for P20DA typically range from $20 to $300, depending on the root cause. Simple wiring or connector repairs are on the lower end, while component replacement costs more. A proper diagnosis ($80–$150 at most shops) will identify the exact cause before committing to expensive parts.

What To Do Next

Possible Fixes

🔧 Inspect and repair Exhaust Aftertreatment Fuel Supply wiring for short to voltage
🔧 Clean or replace corroded Exhaust Aftertreatment Fuel Supply connector
🔧 Replace faulty Exhaust Aftertreatment Fuel Supply

1
Find your vehicle above
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2
Check for recalls
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3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.