OBD Guide

P0A01

Motor Electronics Coolant Temperature Sensor A Circuit Range/Performance

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$6–28 (est.)

Symptoms

  • Check Engine light comes on
  • Increased fuel consumption
  • Reduced engine power
  • Problems starting in cold weather
  • Unstable engine operation at idle

Causes

  • Coolant temperature sensor malfunction
  • Open or short circuit in the sensor circuit
  • Poor contact in the sensor connector
  • Sensor contact corrosion
  • Engine ECU malfunction

How to Fix

  1. Check the condition of the coolant temperature sensor
  2. Check the integrity of the sensor circuit and connectors
  3. Clean the sensor contacts from corrosion
  4. Replace the coolant temperature sensor if necessary
  5. Check the operation of the engine ECU

Related codes

Error P0A01 by Vehicle Brand