U028A

Lost Communication With Transmission Fluid Pump Module B

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–278 (est.)

Symptoms

Check Engine Light Is On
Gear shifting problems
Unusual noises from the transmission
Reduced vehicle dynamics
Transmission transition to emergency mode

Causes

Open or short circuit in the communication circuit
Poor contact in module connectors
Transmission fluid pump module malfunction
Problems with module power or grounding
Transmission ECU malfunction

How to Fix

Check the integrity of the communication circuit between the ECU and the module
Inspect and clean connector contacts
Check power supply and grounding of the module
Test or replace pump module
Check the condition of the transmission ECU

Related codes

U0289 U028B U028C