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1986-1995 Corvette C4 ACDelco Manifold Air Temperature (MAT) Sensor

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product image
Brand Logo ACDelco
Item ID: 611-040
GM Part #: 15326386
Availability: Out of Stock
Fits Years:
  • 1986-1995
  • Description

1986-1995 C4 ACDelco Manifold Air Temperature (MAT) Sensor - OEM Number(s) (15326386)

This essential component delivers precise data to your Corvette's Engine Control Module (ECM). Designed to provide real-time data on incoming air or fuel/air mixture temperature, this variable resistance sensor goes by many names: Charge Temperature Sensor, Air Charge Temperature Sensor, or Air Thermo Sensor.

Crafted with accuracy and reliability in mind, this sensor ensures your engine operates at its optimal temperature range, maximizing efficiency and power output. Count on this advanced technology to fine-tune your C4's performance, delivering a driving experience that's both smooth and powerful.

ACDelco GM Original Equipment sensors are designed, engineered, and tested to rigorous standards, and are backed by General Motors. ACDelco GM Original Equipment parts are the true OE parts installed during the production of or validated by General Motors for GM vehicles.

  • Fits 1986-1991 Corvettes (L98 Only)
  • Fits 1990-1995 Corvettes (LT5 Only)
  • Mushroom Style (Black) Oval Connector
  • Provides ECM with Incoming Air or Fuel/Air Mixture Temperature
  • Variable Resistance Sensor
  • Length: 2.8"
  • Width: 1.2"
  • Height: 0.8"
  • Resistance: 82 Ohms
  • Terminal Quantity: 2
  • Threaded End Diameter: 8.3mm
  • Connector Gender: Female
  • Terminal Gender: Male
  • Terminal Type: Blade
  • Direct OE Replacement
  • Instructions Included

Common Related Engine Fault Codes/Diagnostic Trouble Codes:

  • Code 23 - MAT Sensor - Usually Caused by an Open Circuit
  • Code 25 - MAT Sensor - Usually Caused by Low Circuit Voltage

NOTE: There are 2 designs of Manifold or Air Charge Temperature Sensors used in Corvette production between 1985-1995. The sensor and signal are the same but the Packard connector style (color) changed over a period of time during 1986 production.  Confirm the connector style (color) in your Corvette engine before ordering, etc. The “hamburger” shaped style (gray) was used in early style 1985-1986. The later style 1986-1995 used a “mushroom” shaped style (black) connector.


The chart below gives some of the Typical C4 Corvette Tuned Port Engine Malfunction Codes.

Typical C4 Tuned Port Engine Malfunction Codes
Abrv Fault Code Malfunction
Code 12 ECM system check. It is not a fault code
O2 Code 13 O2 Sensor circuit open or shorted
CTS Code 14 Coolant Sensor temperature circuit voltage low (High temperature indicated)
CTS Code 15
Coolant Sensor temperature circuit voltage high (Low temperature indicated)
TPS Code 21 Throttle Position Sensor circuit (Voltage High)
TPS Code 22
Throttle Position Sensor circuit (Voltage Low)
MAT Code 23 MAT Sensor
VSS Code 24
Vehicle Speed Sensor fault
MAT Code 25
MAT Sensor
EGR Code 32
MAF Code 33 MAF Sensor Manifold absolute pressure sensor (Voltage Low)
MAF Code 34
MAF Sensor Manifold absolute pressure sensor (Voltage High)
Code 36
Burn-Off Function Fault
Code 41
Cylinder Select
EST Code 42
Electronic Spark Timing fault
ESC Code 43
Electronic Spark Control fault
O2 Code 44
Lean Exhaust Indication (Low O2 Sensor Voltage)
O2 Code 45
Rich Exhaust Indication(High O2 Sensor Voltage)
Code 46
Vehicle Anti-Theft Fault
Code 51 MEM/CAL PROM Fault (programable read only memory)
Code 53
System Over Voltage
Code 54
Fuel Pump Voltage Low
ECM Code 55
ECM fault (electronic control module)

Also known under these part numbers: (For reference only)

  • 213-928
  • 021625192819
  • 12001
  • 15326386
  • 213-928
  • TS10077
Prop 65