TESLA Network

Tesla THC Alert Codes

THC reference page with 19 Tesla alert codes, 14 detailed descriptions, severity counts, and diagnostic context.

0
Critical
12
Warning
0
Caution
7
Info

What the THC system covers

THC alerts belong to Tesla's proprietary diagnostic alert system and are grouped under the network category.

Read all active alerts together instead of diagnosing a single code in isolation.
Check recent service, firmware updates, and low-voltage battery condition.
Use Tesla Service or a qualified EV technician for safety-critical systems.

Alert type breakdown

Warning 12 Diagnostic 4 Unknown 3

Tesla THC code list

Rows with a linked code have a dedicated detail page.

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Code Severity Type Description
THC_d0004
THC_d0004_pumpPT
Info Diagnostic
THC_d0004 - pump PT

Tesla diagnostic code in the THC (THC) module. The coolant pump DTC is set on the Thermal Controller (THC) if the following alerts occur repeatedly over a specific time frame. THC_w0039_pumpPTLimp is set for 300 seconds or 100 times with less than 30 minutes between each occurrence. THC_w0040_pumpPTStop is set for 120 seconds or 10 times with less than 30 minutes between each occurrence. THC_w0044_sanityPumpPT is set for 120 seconds or 100 times with less than 30 minutes between each occurrence. THC_w0045_pumpPTFaultMax is set for 300 seconds or 100 times with less than 30 minutes between each occurrence. Diagnose the pump condition by investigating the relevant pump alert article(s) under Possible Causes.

THC_d0005
THC_d0005_pumpBat1
Info Diagnostic
THC_d0005 - pump Bat1

Tesla diagnostic code in the THC (THC) module. The coolant pump DTC is set on the Thermal Controller (THC) if the following warnings occur repeatedly over a specific time frame. THC_w0039_pumpPTLimp is set for 300 seconds or 100 times with less than 30 minutes between each occurrence. THC_w0040_pumpPTStop is set for 120 seconds or 10 times with less than 30 minutes between each occurrence. THC_w0044_sanityPumpPT is set for 120 seconds or 100 times with less than 30 minutes between each occurrence. THC_w0045_pumpPTFaultMax is set for 300 seconds or 100 times with less than 30 minutes between each occurrence. Diagnose the pump condition by investigating the relevant pump alert article(s) under Possible Causes.

THC_d0006
THC_d0006_pumpBat2
Info Diagnostic
THC_d0006 - pump Bat2

Tesla diagnostic code in the THC (THC) module. The coolant pump DTC is set on the Thermal Controller (THC) if the following warnings occur repeatedly over a specific time frame. THC_w0039_pumpPTLimp is set for 300 seconds or 100 times with less than 30 minutes between each occurrence. THC_w0040_pumpPTStop is set for 120 seconds or 10 times with less than 30 minutes between each occurrence. THC_w0044_sanityPumpPT is set for 120 seconds or 100 times with less than 30 minutes between each occurrence. THC_w0045_pumpPTFaultMax is set for 300 seconds or 100 times with less than 30 minutes between each occurrence. Diagnose the pump condition by investigating the relevant pump alert article(s) under Possible Causes.

THC_d0018
THC_d0018_activeAero
Info Diagnostic
THC_d0018 - active Aero

Tesla diagnostic code in the THC (THC) module. User Description: Toolbox can be used to resync the aero shutters.

THC_u0002
THC_u0002_frontDefrostLimited
Info Unknown
THC_u0002 - front Defrost Limited

Tesla unknown code in the THC (THC) module. The front defrost is limited because of low battery power.

THC_u0003
THC_u0003_cabinHVACLimited_HV
Info Unknown
THC_u0003 - cabin HVAC Limited HV

Tesla unknown code in the THC (THC) module related to cabin hvac limited hv.

THC_u0005
THC_u0005_cabinHVACLimited_PT
Info Unknown
THC_u0005 - cabin HVAC Limited PT

Tesla unknown code in the THC (THC) module. The cabin HVAC cooling is limited due to other vehicle side demands, such as HV battery cooling during supercharging.?

THC_w0016
THC_w0016_compOverheatWarning
Warning Warning
THC_w0016 - comp Overheat Warning

Tesla warning code in the THC (THC) module. None

THC_w0026
THC_w0026_DASCanTmo
Warning Warning
THC_w0026 - DAS CAN Tmo

Tesla warning code in the THC (THC) module related to das can tmo.

THC_w0042
THC_w0042_tempAuxHvacEvapRange
Warning Warning
THC_w0042 - temp Aux Hvac Evap Range

Tesla warning code in the THC (THC) module. The THC_w0042_tempAuxHvacEvapRange alert shall be set if:The value of the auxiliary HVAC evaporator temperature sensor is <= 100�C OR >= -40�C,The Thermal Controller (THC) is initialized.The THC_w0042_tempAuxHvacEvapRange alert shall be cleared if:The value of the auxiliary HVAC evaporator temperature sensor is > 100�C AND < -40�C.The Thermal Controller (THC) is uninitialized.

THC_w0105
THC_w0105_coolantBottleLowLevel
Warning Warning
THC_w0105 - coolant Bottle Low Level

Tesla warning code in the THC (THC) module. The level sensor in the coolant bottle is reading that the coolant level is too low. This alert will disable battery coolant heater.

THC_w0148
THC_w0148_refrigerantLow
Warning Warning
THC_w0148 - refrigerant Low

Tesla warning code in the THC (THC) module. The THC_w0148_refrigerantLow? warning was first released in FW 2017.24+ The THC_w0148_refrigerantLow alert shall be set if the following conditions are met for 60 seconds: THC is initialized The ambient temperature sensor is not faultedThe ambient temperature > 0 deg C Refrigerant discharge temp > 0 deg CThere are no refrigerant discharge temperature alerts (THC_a0137_rfrgDisTemp or THC_a0138_rfrgDisTempRange) There are no refrigerant suction temperature alerts (THC_a0142_rfrgSuctPress) or THC_a0145_rfrgSuctPressRange) The refrigerant discharge pressure < 0.25 bar The THC_w0148_refrigerantLow alert shall be cleared if the following conditions are met for 30 seconds: THC is initialized The ambient temperature sensor is not faulted The ambient temperature > 0 deg C Refrigerant discharge temp > 0 deg C There are no refrigerant discharge temperature alerts (THC_a0137_rfrgDisTemp or THC_a0138_rfrgDisTempRange) There are no refrigerant suction temperature alerts (THC_a0142_rfrgSuctPress) or THC_a0145_rfrgSuctPressRange) The refrigerant discharge pressure > 1.5 bar? Note: This warning will be customer facing in 2017.50.

THC_w0160
THC_w0160_compOvervoltage
Warning Warning
THC_w0160 - comp Overvoltage

Tesla warning code in the THC (THC) module related to comp overvoltage.

THC_w0190
THC_w0190_compShortCircuit
Warning Warning
THC_w0190 - comp Short Circuit

Tesla warning code in the THC (THC) module related to comp short circuit.

THC_w0237
THC_w0237_PTC_LeftCoreTempSensor
Warning Warning
THC_w0237 - PTC Left Core Temp Sensor

Tesla warning code in the THC (THC) module. This alert indicates the high voltage cabin heater has an internal temperature sensor problem.

THC_w0238
THC_w0238_PTC_RtCoreTempSensor
Warning Warning
THC_w0238 - PTC Rt Core Temp Sensor

Tesla warning code in the THC (THC) module. This alert indicates the high voltage cabin heater has an internal temperature sensor problem.

THC_w0242
THC_w0242_exvSelfError
Warning Warning
THC_w0242 - exv Self Error

Tesla warning code in the THC (THC) module. The THC_w0242_exvSelfError alert is set if the following is true: The EXV_Diagnosis signal has separately indicated an error 5 times since the thermal controller (THC) has powered on. The EXV_Diagnosis signal continuously indicates an error for 30 seconds.

THC_w0243
THC_w0243_aqsLinTmo
Warning Warning
THC_w0243 - aqs Lin Tmo

Tesla warning code in the THC (THC) module. None

THC_w0254
THC_w0254_radFanProblem
Warning Warning
THC_w0254 - rad Fan Problem

Tesla warning code in the THC (THC) module related to rad fan problem.