P0739

TCM Engine Speed Output Circuit High

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$6–56 (est.)

Symptoms

Incorrect gear shifting
Enabling transmission emergency mode
Check Engine Light Illuminates
Reduced vehicle dynamics
Floating engine speed

Causes

Open or short circuit in engine output speed circuit
Engine speed sensor malfunction
Connector problems or contact corrosion
Transmission control module (TCM) internal malfunction
Wiring Harness Problems

How to Fix

Check the continuity of the motor output speed circuit
Inspect and clean connector contacts
Check the functionality of the engine speed sensor
Scan the transmission control unit for errors
Replace damaged components if necessary

Related codes

P0736 P0737 P0738