AutoCodes – Generic – P0A02

P0A02 Code - Motor Electronics Coolant Temperature Sensor Circuit Low

Quick Answer

The power management control Electronic Control Unit (ECU) detects HV coolant temperature using the coolant temperature sensor built into the inverter with converter assembly. Common causes include Faulty Motor Electronics Coolant Temperature Sensor, Motor Electronics Coolant Temperature Sensor harness is open or shorted, Motor Electronics Coolant Temperature Sensor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P0A02 indicates Motor Electronics Coolant Temperature Sensor Circuit Low.
Common causes: Common causes include Faulty Motor Electronics Coolant Temperature Sensor, Motor Electronics Coolant Temperature Sensor harness is open or shorted, Motor Electronics Coolant Temperature Sensor circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 3,250

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Feb 22, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P0A02 Description

The power management control Electronic Control Unit (ECU) detects HV coolant temperature using the coolant temperature sensor built into the inverter with converter assembly. The power management control ECU uses signals from the coolant temperature sensor to check the effectiveness of the inverter cooling system. If necessary, the power management control ECU will limit inverter output to help prevent inverter overheating. The power management control ECU also detects malfunctions in the sensor based on the HV coolant temperature sensor values. The inverter with converter assembly detects malfunctions in the HV coolant temperature sensor and its wiring.

OBDII Code P0A02 - Motor Electronics Coolant Temperature Sensor Circuit Low - AutoCodes.com — P0A02 Code - Motor Electronics Coolant Temperature Sensor Circuit Low

What does this mean?

What are the Possible Causes of the DTC P0A02?

Faulty Motor Electronics Coolant Temperature Sensor
Motor Electronics Coolant Temperature Sensor harness is open or shorted
Motor Electronics Coolant Temperature Sensor circuit poor electrical connection

How to Fix the DTC P0A02?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0A02 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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Information for Specific Makes

P0A02 Buick — Starter/Generator Control Module Coolant Temperature Sensor 1 Circuit Low Voltage
P0A02 Cadillac — Starter/Generator Control Module Coolant Temperature Sensor 1 Circuit Low Voltage
P0A02 Chevrolet — Starter/Generator Control Module Coolant Temperature Sensor 1 Circuit Low Voltage
P0A02 Dodge — Motor Electronics Coolant Temperature Sensor Circuit Low
P0A02 GMC — Starter/Generator Control Module Coolant Temperature Sensor 1 Circuit Low Voltage
P0A02 Lexus — Motor Electronics Coolant Temperature Sensor Circuit Low
P0A02 Saturn — Starter/Generator Control Module Coolant Temperature Sensor 1 Circuit Low Voltage
P0A02 Toyota — Motor Electronics Coolant Temperature Sensor Circuit Low

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.