Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSTOYOTA2001HIGHLANDER BASE, 2.4 D, FWDREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROL SYSTEM SELF-DIAGNOSTICS - 4-CYLINDERDIAGNOSTIC TROUBLE CODE DEFINITIONS

2001 Toyota Highlander Base, 2.4 D, FWD

Diagnostic Trouble Code Definitions

2001 Toyota Highlander Base, 2.4 D, FWDSECTION Diagnostic Trouble Code Definitions

DIAGNOSTIC TROUBLE CODE DEFINITIONS

DTC ⁽¹⁾

Description

B2795 ⁽²⁾

Unmatched Key Code

B2796 ⁽²⁾

No Communication In Immobilizer System

B2797 ⁽²⁾

Communication Malfunction No. 1

B2798 ⁽²⁾

Communication Malfunction No. 2

P0100 ⁽³⁾

Mass Airflow Meter Circuit

P0101

Mass Airflow Meter Circuit Range/Performance

P0110 ⁽³⁾

Intake Air Temperature Sensor Circuit

P0115 ⁽³⁾

Engine Coolant Temperature Sensor Circuit

P0116

Engine Coolant Temperature Sensor Circuit Range/Performance

P0120 ⁽³⁾

Throttle Position Sensor Circuit

P0121

Throttle Position Sensor Circuit Range/Performance

P0125

Insufficient Coolant Temperature For Closed Loop Fuel Control

P0128

Thermostat Malfunction

P0136 ⁽⁵⁾

Heated Oxygen Sensor No. 2 Circuit (Bank No. 1)

P0141 ⁽³⁾⁽⁵⁾

Heated Oxygen Sensor No. 2 Heater Circuit (Bank No. 1)

P0156 ⁽⁵⁾

Heated Oxygen Sensor No. 2 Circuit (Bank No. 2)

P0161 ⁽³⁾⁽⁵⁾

Heated Oxygen Sensor No. 2 Heater Circuit (Bank No. 2)

P0171

System Too Lean (Bank No. 1)

P0172

System Too Rich (Bank No. 1)

P0174

System Too Lean (Bank No. 2)

P0175

System Too Lean (Bank No. 2)

P0300

Random Misfire Detected

P0301

Cylinder No. 1 Misfire Detected

P0302

Cylinder No. 2 Misfire Detected

P0303

Cylinder No. 3 Misfire Detected

P0304

Cylinder No. 4 Misfire Detected

P0325 ⁽³⁾

Knock Sensor Circuit

P0335

Crankshaft Position Sensor Circuit

P0340

Camshaft Position Sensor Circuit

P0420

Catalyst System Efficiency Below Threshold (Bank No. 1)

P0430

Catalyst System Efficiency Below Threshold (Bank No. 2)

P0440

Evaporative Emission Control System

P0441

Incorrect EVAP Purge Flow

P0442

Evaporative Emission Control System Leak Detected

P0446

EVAP Vent Control Circuit

P0450

EVAP Pressure Sensor Circuit

P0451

EVAP Pressure Sensor Range/Performance

P0500

Vehicle Speed Sensor Circuit

P0505

Idle Air Control System Circuit

P0710 ⁽⁷⁾

Transmission Fluid Temperature Sensor Malfunction

P0711 ⁽⁷⁾

Transmission Fluid Temperature Sensor Range/Performance

P0750 ⁽⁷⁾

Shift Solenoid A Malfunction (Shift Solenoid Valve SL1)

P0753 ⁽⁷⁾

Shift Solenoid A Electrical Malfunction (Shift Solenoid Valve SL1)

P0755 ⁽⁷⁾

Shift Solenoid B Malfunction (Shift Solenoid Valve SL2)

P0758 ⁽⁷⁾

Shift Solenoid B Electrical Malfunction (Shift Solenoid Valve SL2)

P0765 ⁽⁷⁾

Shift Solenoid D Malfunction (Shift Solenoid Valve S4)

P0768 ⁽⁷⁾

Shift Solenoid D Electrical Malfunction (Shift Solenoid Valve S4)

P0770 ⁽⁷⁾

Shift Solenoid E Malfunction (Shift Solenoid Valve DSL)

P0773 ⁽⁷⁾

Shift Solenoid E Electrical Malfunction (Shift Solenoid Valve DSL)

P1130 ⁽⁴⁾

Air/Fuel Sensor Circuit Range/Performance

P1133 ⁽⁴⁾

Air/Fuel Sensor Circuit Response

P1135 ⁽³⁾⁽⁴⁾

Air/Fuel Sensor Heater Circuit

P1150 ⁽⁶⁾

Air/Fuel Sensor Circuit Range/Performance

P1153 ⁽⁶⁾

Air/Fuel Sensor Circuit Response

P1155 ⁽³⁾⁽⁶⁾

Air/Fuel Sensor Heater Circuit

P1300 ⁽³⁾

Ignitor No. 1 Circuit Malfunction

P1305 ⁽³⁾

Ignitor No. 2 Circuit Malfunction

P1310 ⁽³⁾

Ignitor No. 3 Circuit Malfunction

P1315 ⁽³⁾

Ignitor No. 4 Circuit Malfunction

P1335 ⁽⁸⁾

Crankshaft Position Sensor Circuit

P1346

Variable Valve Timing Circuit Range/Performance

P1349

Variable Valve Timing System Malfunction

P1520

Stoplight Switch Signal Circuit

P1600

ECM BATT Circuit

P1645:

Body ECU Malfunction

P1656

Oil Control Valve Malfunction

P1725 ⁽⁷⁾

NT Revolution Sensor Circuit Malfunction (Input Turbine Speed Sensor)

P1730 ⁽⁷⁾

NT Revolution Sensor Circuit Malfunction (Counter Gear Speed Sensor)

P1760 ⁽⁷⁾

Shift Solenoid Valve SLT Malfunction

P1780

Park/Neutral Position Switch Circuit

⁽¹⁾	Some DTCs are two-trip detection logic DTCs. For more information, see TWO-TRIP DETECTION LOGIC under SELF-DIAGNOSTIC SYSTEM.

⁽²⁾	DTC applies to models equipped with engine immobilizer system. MIL will not illuminate if DTC exists. For testing procedures, see appropriate ENGINE IMMOBILIZER SYSTEMS article in ACCESSORIES & EQUIPMENT.

⁽³⁾	If this DTC is set, Engine Control Module (ECM) will enter fail-safe mode.

⁽⁴⁾	This DTC applies to bank No. 1 sensor No. 1.

⁽⁵⁾	This DTC applies to bank No. 1 sensor No. 2.

⁽⁶⁾	This DTC applies to bank No. 2 sensor No. 1.

⁽⁷⁾	DTC applies electronically controlled automatic transaxle. For testing procedures, see appropriate ELECTRONIC CONTROLS article in AUTOMATIC TRANSMISSIONS.

⁽⁸⁾	MIL will not illuminate.

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.