C0181

Throttle Reduction Motor Circuit Malfunction

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

Unstable idle
Power dips during acceleration
Check Engine light comes on
Difficulty starting the engine

Causes

Open or shorted wiring harness
Throttle reduction motor malfunction
Problems with the ECU
Oxidized or damaged contacts

How to Fix

Check the wiring harness for opens and shorts
Test the throttle reduction motor
Check contacts and connections
Replacing the reduction motor or repairing the wiring harness
Resetting the error and re-diagnosis

Related codes

P0121 P0122 P0123