P0C23

Electric/Auxiliary Transmission Fluid Pump Control Module Circuit/Open

Severity

🔴 High

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$89–278 (est.)

Symptoms

Hard gear shifting
Transmission transition to emergency mode
Fault indication on the instrument panel
Reduced efficiency of the hybrid system (for hybrids)
Increased transmission noise

Causes

Open or short circuit in wiring
Auxiliary pump control module malfunction
Poor contact in connectors
Problems with the pump circuit relay or fuse
Transmission control module (TCM) malfunction

How to Fix

Check the integrity of the wiring and connectors in the pump circuit
Check voltage and ground on the pump module
Test the pump motor winding resistance
Diagnose the transmission control unit for errors
Replace faulty pump control module if necessary

Related codes

P0C24 P0C25 P0C26