P1477 — Leakage Diagnostic Pump Reed Switch Did Not Open

What Does P1477 Mean?

P1477 is a manufacturer-specific diagnostic trouble code: Leakage Diagnostic Pump Reed Switch Did Not Open. This code applies to BMW, VOLKSWAGEN, OTHER, DODGE, JEEP vehicles. Unlike generic OBD-II codes, manufacturer-specific codes are defined by the vehicle maker and may only apply to certain makes and models.

Symptoms of P1477

⚠️ Check Engine Light (MIL) illuminated
⚠️ Leakage Diagnostic Pump Reed Switch Did Not Open not functioning as expected
⚠️ Related system may be in fail-safe mode
⚠️ Reduced engine performance

Common Causes

🔍 Faulty Leakage Diagnostic Pump Reed Switch Did Not Open
🔍 Wiring or connector issue in Leakage Diagnostic Pump Reed Switch Did Not Open circuit
🔍 Related mechanical or electrical fault
🔍 ECM/PCM issue (rare)

Frequently Asked Questions

What does P1477 mean?

P1477 indicates: Leakage Diagnostic Pump Reed Switch Did Not Open. The vehicle's computer has detected that the Leakage Diagnostic Pump Reed Switch Did Not Open is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P1477?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P1477 for extended periods may cause additional problems.

How much does it cost to fix P1477?

Repair costs for P1477 typically range from $80 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 Leakage Diagnostic Pump Reed Switch Did Not Open and related wiring
🔧 Replace faulty Leakage Diagnostic Pump Reed Switch Did Not Open

1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

P1477: Leakage Diagnostic Pump Reed Switch Did Not Open