P27A1: Electric/Auxiliary Transmission Fluid Pump A Stuck On
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 P27A1 Mean?
P27A1 is a diagnostic trouble code indicating: Electric/Auxiliary Transmission Fluid Pump A Stuck On. This code relates to the powertrain system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.
Symptoms of P27A1
- ⚠️ Check Engine Light (MIL) illuminated
- ⚠️ Electric/Auxiliary Transmission Fluid Pump A remains active when it should be off
- ⚠️ Related system running continuously
- ⚠️ Reduced engine performance
Common Causes
- 🔍 Electric/Auxiliary Transmission Fluid Pump A mechanically stuck in active position
- 🔍 Short circuit holding Electric/Auxiliary Transmission Fluid Pump A control on
- 🔍 Faulty Electric/Auxiliary Transmission Fluid Pump A driver circuit in ECM/PCM
Frequently Asked Questions
What does P27A1 mean?
Can I drive with code P27A1?
How much does it cost to fix P27A1?
What To Do Next
Possible Fixes
- 🔧 Inspect Electric/Auxiliary Transmission Fluid Pump A for mechanical binding or debris
- 🔧 Replace stuck Electric/Auxiliary Transmission Fluid Pump A
- 🔧 Check Electric/Auxiliary Transmission Fluid Pump A control circuit for short
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1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
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Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
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Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.