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.

2003 Toyota Highlander Limited, AWDFACTORY OEM SERVICE PROCEDURE

Diagnostic Trouble Code Definitions

DIAGNOSTIC TROUBLE CODE DEFINITIONS

DTC ⁽¹⁾
0

Description

B2796 ⁽²⁾⁽³⁾

No Communication In Immobilizer System

B2797 ⁽²⁾⁽³⁾

Communication Malfunction No. 1

B2798 ⁽²⁾⁽³⁾

Communication Malfunction No. 2

Camshaft Position "A" Actuator Circuit (Bank No. 1)

Camshaft Position "A" - Timing Over - Advanced Or System Performance (Bank No. 1)

Camshaft Position "A" - Timing Over - Retarded (Bank No. 1)

Crankshaft Position - Camshaft Position Correlation (Bank No. 1 Sensor "A")

Crankshaft Position - Camshaft Position Correlation (Bank No. 2 Sensor "A")

Camshaft Position "A" Actuator Circuit (Bank No. 2)

Camshaft Position "A" - Timing Over - Advanced Or System Performance (Bank No. 2)

Camshaft Position "A" - Timing Over - Retarded (Bank No. 2)

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

P0100 ⁽⁴⁾

Mass Air Flow Circuit Malfunction

Mass Air Flow Circuit Range/Performance Problem

P0110 ⁽⁴⁾

Intake Air Temperature Circuit Malfunction

P0115 ⁽⁴⁾

Engine Coolant Temperature Circuit Malfunction

Engine Coolant Temperature Circuit Range/Performance Problem

P0120 ⁽⁴⁾

Throttle/Pedal Position Sensor/Switch "A" Circuit Malfunction

Throttle/Pedal Position Sensor/Switch "A" Circuit Range/Performance Problem

Insufficient Coolant Temperature For Closed Loop Fuel Control

Thermostat Malfunction

Oxygen Sensor Circuit No Activity Detected (Bank No. 1 Sensor No. 1)

P0135 ⁽⁴⁾

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

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

Oxygen Sensor Circuit No Activity Detected (Bank No. 2 Sensor No. 1)

P0155 ⁽⁴⁾

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

System Too Lean (Fuel Trim, Bank No. 1)

System Too Rich (Fuel Trim, Bank No. 1)

System Too Lean (Bank No. 2)

System Too Lean (Bank No. 2)

Random/Multiple Cylinder 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

P0325 ⁽⁴⁾

Knock Sensor No. 1 Circuit Malfunction (Bank No. 1 Or Single Sensor)

P0330 ⁽⁴⁾

Knock Sensor No. 2 Circuit Malfunction (Bank No. 2)

Crankshaft Position Sensor "A" Circuit Malfunction

Crankshaft Position Sensor "A" Circuit Intermittent

Camshaft Position Sensor Circuit Malfunction

Camshaft Position Sensor "A" Circuit Range/Performance (Bank No. 1 Or Single Sensor)

Camshaft Position Sensor "A" Circuit (Bank No. 2)

Camshaft Position Sensor "A" Circuit Range/Performance (Bank No. 2)

P0351 ⁽⁴⁾

Ignition Coil "A" Primary/Secondary Circuit

P0352 ⁽⁴⁾

Ignition Coil "B" Primary/Secondary Circuit

P0353 ⁽⁴⁾

Ignition Coil "C" Primary/Secondary Circuit

P0354 ⁽⁴⁾

Ignition Coil "D" Primary/Secondary Circuit

P0355 ⁽⁴⁾

Ignition Coil "E" Primary/Secondary Circuit

P0356 ⁽⁴⁾

Ignition Coil "F" Primary/Secondary Circuit

Catalyst System Efficiency Below Threshold (Bank No. 1)

EVAP System Incorrect Purge Flow

EVAP System Leak Detected (Small Leak)

EVAP System Vent Control Malfunction

EVAP System Pressure Sensor Malfunction

EVAP System Pressure Sensor Range/Performance

EVAP System Leak Detected (Very Small Leak)

Vehicle Speed Sensor Malfunction

Idle Control System Malfunction

Idle Air Control Circuit

P0513 ⁽²⁾⁽³⁾

Incorrect Immobilizer Key

System Voltage

Brake Switch "B" Circuit High

Park/Neutral Position Switch Malfunction

Body ECU Malfunction

Oxygen Sensor Signal Stuck Lean (Bank No. 1 Sensor No. 1)

Oxygen Sensor Signal Stuck Rich (Bank No. 1 Sensor No. 1)

Oxygen Sensor Signal Stuck Lean (Bank No. 2 Sensor No. 1)

Oxygen Sensor Signal Stuck Rich (Bank No. 2 Sensor No. 1)

Oxygen Sensor Pumping Current Circuit/Open For A/F Sensor (Bank No. 1 Sensor No. 1)

Oxygen Sensor Pumping Current Circuit/Open For A/F Sensor (Bank No. 2 Sensor No. 1)

A/F Sensor Circuit Slow Response (Bank No. 1 Sensor No. 1)

A/F Sensor Circuit Slow Response (Bank No. 2 Sensor No. 1)

⁽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⁾	MIL will not illuminate.

⁽⁴⁾	If this DTC is set, engine control module (ECM) will enter fail-safe mode.

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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