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.

2000 Toyota Sienna XLEFACTORY OEM SERVICE PROCEDURE

Diagnostic Trouble Code Definitions

DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION

DTC ⁽¹⁾

Description

B2785 ⁽²⁾

Ignition Switch On Malfunction

B2786 ⁽²⁾

Ignition Switch Off Malfunction

B2791 ⁽²⁾

Key Unlock Warning Switch Off Malfunction

B2795 ⁽²⁾

Unmatched Key Code

B2796 ⁽²⁾

No Communication In Immobilizer System

B2797 ⁽²⁾

Communication Malfunction No. 1

B2798 ⁽²⁾

Communication Malfunction No. 2

Mass Airflow (MAF) Meter Circuit

Mass Airflow (MAF) Meter Circuit Range/Performance

Intake Air Temperature (IAT) Sensor Circuit

Engine Coolant Temperature (ECT) Sensor Circuit

Engine Coolant Temperature (ECT) Sensor Circuit Range/Performance

Throttle Position (TP) Sensor Circuit

Throttle Position (TP) Sensor Circuit Range/Performance

Insufficient Coolant Temperature For Closed Loop Fuel Control (Except Calif. Emissions)

Insufficient Coolant Temperature For Closed Loop Fuel Control (Calif. Emissions)

P0130 ⁽⁴⁾

Heated Oxygen Sensor No. 1 Circuit (Except Calif. Emissions)

P0133 ⁽⁴⁾

Heated Oxygen Sensor No. 1 Circuit Slow Response (Except Calif. Emissions)

P0135 ⁽³⁾⁽⁴⁾

Heated Oxygen Sensor No. 1 Heater Circuit (Except Calif. Emissions)

P0136 ⁽⁵⁾

Heated Oxygen Sensor No. 2 Circuit

P0141 ⁽³⁾⁽⁵⁾

Heated Oxygen Sensor No. 2 Heater Circuit

P0150 ⁽⁶⁾

Heated Oxygen Sensor No. 1 Circuit (Except Calif. Emissions)

P0153 ⁽⁶⁾

Heated Oxygen Sensor No. 1 Circuit Slow Response (Except Calif. Emissions)

P0155 ⁽³⁾⁽⁶⁾

Heated Oxygen Sensor No. 1 Heater Circuit (Except Calif. Emissions)

System Too Lean (Except Calif. Emissions)

System Too Lean (Calif. Emissions)

System Too Rich (Except Calif. Emissions)

System Too Rich (Calif. Emissions)

Random Misfire Detected

Cylinder No. 1 Misfire Detected

Cylinder No. 2 Misfire Detected

Cylinder No. 3 Misfire Detected

Cylinder No. 4 Misfire Detected

Cylinder No. 5 Misfire Detected

Cylinder No. 6 Misfire Detected

Knock Sensor No. 1 Circuit

Knock Sensor No. 2 Circuit

Crankshaft Position (CKP) Sensor Circuit

Camshaft Position (CMP) Sensor Circuit

Catalyst System Efficiency Below Threshold (Except Calif. Emissions)

Catalyst System Efficiency Below Threshold (Calif. Emissions)

Evaporative Emission Control System

Incorrect EVAP Purge Flow

EVAP Vent Control Circuit

EVAP Pressure Sensor Circuit

EVAP Pressure Sensor Range/Performance

Vehicle Speed Sensor Circuit

Idle Air Control (IAC) System Circuit

P0710 ⁽⁷⁾

Transmission Fluid Temperature Sensor Malfunction

P0750 ⁽⁷⁾

Shift Solenoid Valve No. 1 Malfunction

P0753 ⁽⁷⁾

Shift Solenoid Valve No. 1 Electrical Malfunction

P0755 ⁽⁷⁾

Shift Solenoid Valve No. 2 Malfunction

P0758 ⁽⁷⁾

Shift Solenoid Valve No. 2 Electrical Malfunction

P0770 ⁽⁷⁾

Lock-Up Solenoid Malfunction

P0773 ⁽⁷⁾

Lock-Up Solenoid Circuit Electrical Malfunction

P1130 ⁽⁴⁾

Air/Fuel Sensor Circuit Range/Performance (Calif. Emissions)

P1133 ⁽⁴⁾

Air/Fuel Sensor Circuit Response (Calif. Emissions)

P1135 ⁽⁴⁾

Air/Fuel Sensor Heater Circuit (Calif. Emissions)

P1150 ⁽⁶⁾

Air/Fuel Sensor Circuit Range/Performance (Calif. Emissions)

P1153 ⁽⁶⁾

Air/Fuel Sensor Circuit Response (Calif. Emissions)

P1155 ⁽⁶⁾

Air/Fuel Sensor Heater Circuit (Calif. Emissions)

Ignitor Circuit

P1335 ⁽⁸⁾

Crankshaft Position (CKP) Sensor Circuit

Stoplight Switch Signal Circuit (A/T)

ECM BATT Circuit

Park/Neutral Position (PNP) Switch Circuit (A/T)

⁽¹⁾	Some codes are two-trip detection logic code(s). For more information, see TWO-TRIP DETECTION LOGIC in SELF-DIAGNOSTICS - INTRODUCTION article.

⁽²⁾	These codes are for models equipped with engine immobilizer system. MIL will not illuminate. For testing procedures, see appropriate ENGINE IMMOBILIZER SYSTEMS article in ACCESSORIES & EQUIPMENT.

⁽³⁾	If this code is set, ECM will enter fail-safe mode.

⁽⁴⁾	This code applies to bank No. 1, sensor No. 1.

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

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

⁽⁷⁾	These codes only apply to models with electronically controlled transmissions. For testing procedures, see appropriate ELECTRONIC CONTROLS article in AUTOMATIC TRANSMISSIONS.

⁽⁸⁾	MIL will not illuminate.

Factory Service Tools

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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.

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