P2799

Electric/Auxiliary Transmission Fluid Pump A Control Circuit High

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

Check Engine light comes on
The car goes into emergency gearbox mode
Difficult or harsh gear shifting
Reduced transmission efficiency
Unusual noises from the transmission area

Causes

Short circuit in pump control circuit
Transmission fluid auxiliary pump malfunction
Problems with the pump circuit relay or fuse
Broken or damaged wiring
Transmission control module (TCM) malfunction

How to Fix

Check fuses and relays associated with the pump
Inspect the wiring harness for damage
Check resistance and voltage in the pump circuit
Test the operation of the auxiliary pump
If necessary, replace the pump or wiring

Related codes

P2797 P2798 P2800