P27A5

Electric/Auxiliary Transmission Fluid Pump B Control Circuit High

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$6–167 (est.)

Symptoms

Check Engine Light Is On
Possible problems with gear shifting
Reduced transmission efficiency
Transmission fluid overheating
Noise or humming from the transmission area

Causes

Short circuit in pump control circuit
Broken or damaged wiring
Pump solenoid valve malfunction
Problems with the transmission control unit

How to Fix

Check control circuit for short circuit
Inspect wiring and plug connections
Test the operation of the transmission fluid pump
Check transmission control unit
Replace the faulty pump if necessary

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