AutoCodes – Generic – P00B1

P00B1 Code - Radiator Coolant Temperature Sensor Circuit

Quick Answer

The Radiator Coolant Temperature (RCT) sensor is a variable resistor that measures the temperature of the engine coolant in the radiator. Common causes include Faulty Radiator Coolant Temperature (RCT) Sensor, Radiator Coolant Temperature Sensor harness is open or shorted, Radiator 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: P00B1 indicates Radiator Coolant Temperature Sensor Circuit.
Common causes: Common causes include Faulty Radiator Coolant Temperature (RCT) Sensor, Radiator Coolant Temperature Sensor harness is open or shorted, Radiator 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 2,936

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 Sep 30, 2022

Description
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
Comments
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Code P00B1 Description

The Radiator Coolant Temperature (RCT) sensor is a variable resistor that measures the temperature of the engine coolant in the radiator. This diagnostic checks for an open, short to ground, or an intermittent circuit condition between the Engine Control Module (ECM) and RCT sensor. The Diagnostic Trouble Code (DTC) will be set when the ECM detects the RCT is out of factory specifications.

OBDII Code P00B1 - Radiator Coolant Temperature Sensor Circuit - AutoCodes.com — P00B1 Code - Radiator Coolant Temperature Sensor Circuit

What does this mean?

What are the Possible Causes of the DTC P00B1?

Faulty Radiator Coolant Temperature (RCT) Sensor
Radiator Coolant Temperature Sensor harness is open or shorted
Radiator Coolant Temperature Sensor circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P00B1?

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 does this mean?

Code Tech Notes

User Submitted Video

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P00B1 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.

Need more information about the P00B1 code?

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Information for Specific Makes

P00B1 Buick — Radiator Coolant Temperature Sensor Circuit
P00B1 Cadillac — Radiator Coolant Temperature Sensor Circuit
P00B1 Chevrolet — Radiator Coolant Temperature Sensor Circuit
P00B1 GMC — Radiator Coolant Temperature Sensor Circuit

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.