Coolant Temperature Sensor - M12 x 1.5

Overview

The Haltech M12 x 1.5 coolant temperature sensor delivers precise engine temperature monitoring for your EFI conversion or performance build. This GM-calibrated sensor provides accurate 0-5V output to your Haltech ECU, enabling proper fuel and ignition mapping across all temperature ranges whilst protecting your engine from overheating damage.

Technical Specifications

• Part Number: HT-010300
• Thread Size: M12 x 1.5mm
• Output: 0-5V analogue signal
• Calibration File: Temperature - GM Coolant Sensor.cal
• Connector: Delphi plug with pins included
• Temperature Range: -40°C to +150°C operating

Why You Need This

Accurate coolant temperature monitoring is absolutely critical for any performance build or EFI conversion. Your Haltech ECU relies on this sensor data to calculate fuel enrichment during warm-up, adjust ignition timing for optimal power, and trigger cooling fan operation. Without proper temperature sensing, you'll experience cold-start issues, poor fuel economy, and risk catastrophic engine damage from overheating. The M12 x 1.5 thread size is perfect for LS swap builds, many Japanese engines including SR20DET and CA18DET applications, and European vehicles where the smaller thread pitch provides a secure seal in aluminium heads.

We see too many builders attempting to reuse old temperature sensors or fit incorrect thread pitches, leading to inaccurate readings, coolant leaks, and mapping headaches. This genuine Haltech sensor uses the proven GM temperature curve that's been validated across thousands of builds. The included Delphi connector ensures a reliable connection to your Haltech loom, whilst the compact design fits tight engine bay installations where larger sensors simply won't work.

ECU & System Compatibility

Compatible with the full Haltech Elite and Nexus range including Elite 550, 750, 1000, 1500, 2000, and 2500 ECUs, plus Nexus R3 and R5 systems. Uses standard analogue temperature input channels available on all Haltech ECUs. The pre-loaded GM calibration file eliminates setup complexity.

What's in the Box

• Haltech M12 x 1.5 coolant temperature sensor
• Delphi connector plug with pre-crimped pins
• Installation instructions with calibration file reference

Complete Your Build

Most customers completing an EFI conversion also add our Air Temperature Sensor M14x1.5 (HT-010200) for inlet air temperature compensation and GM 1 Bar MAP Sensor (HT-010100) for load sensing. This sensor trio provides your Haltech ECU with all the critical environmental data needed for precise fuel and ignition control. All three sensors are held in UK stock for immediate despatch, and our technical team can advise on the optimal sensor placement for your specific engine and application during pre-sales consultation.