Toyota Tundra The 5 Most Common OBD DTCs

by erwincsalarda · April 15, 2023

Table of Contents

Toyota Tundra The 5 Most Common OBD DTCs

After extensive research, I have identified the top 5 most common diagnostic trouble codes (DTCs) for Toyota Tundra vehicles. These frequently encountered codes include C1201 (Engine Control System Malfunction), P1604 (Startability Malfunction), P2440 (Secondary Air Injection System Switching Valve Stuck Open), P0456 (Evaporative Emission System Leak Detected — Very Small Leak), and U0100 (Lost Communication with ECM/PCM). Understanding and addressing these common issues can help maintain optimal vehicle performance and prevent potential damage.

Toyota Tundra DTC C1201

Description: Engine Control System Malfunction. This code indicates that the Engine Control Module (ECM) has detected a malfunction within the engine control system.

Symptoms:

Check engine light
Traction control light
Poor engine performance
Reduced power mode
Stalling or hesitation
Reduced fuel efficiency

Cause: This code can be caused by a variety of issues, including sensor malfunctions, wiring issues, or problems within the ECM itself.

Possible Location: ECM, ABS control module, engine sensors, wiring harnesses

How to Fix the Problem:

Check for other DTCs that may provide more information about the specific issue.
Inspect wiring and connections for damage or corrosion.
Test individual engine sensors (such as the throttle position sensor, mass airflow sensor, etc.) for proper operation.
If necessary, reprogram or replace the ECM.

How Difficult to Fix: Difficulty varies depending on the underlying issue. Some fixes may be simple and require minimal effort, while others may require professional assistance.

Can You Drive With This Code: It is not recommended to drive with this code, as it may result in poor performance and potential damage to the engine.

How to Clear the Code: Use an OBD-II scanner to clear the code after resolving the issue. Disconnecting the battery may reset the ECM, but it is not the recommended method due to the potential loss of important settings and information.

Tools Needed to Use:

OBD-II scanner: To read and clear the codes
Multimeter: To test sensor and wiring integrity
Scan tool with reprogramming capability: If ECM reprogramming is necessary

Toyota Tundra DTC P1604

Description: Startability Malfunction. This code indicates that the ECM has detected a problem with the vehicle’s ability to start.

Symptoms:

Difficulty starting the vehicle
Intermittent starting issues
Check engine light

Cause: This code can be caused by several factors, including a weak battery, faulty starter, malfunctioning sensors, or problems with the ECM.

Possible Location: Battery, starter, engine sensors, ECM

How to Fix the Problem:

Check the battery voltage and condition. Replace if necessary.
Inspect the starter and its connections for wear or damage. Replace if necessary.
Test individual engine sensors (such as the crankshaft position sensor) for proper operation.
If necessary, reprogram or replace the ECM.

How Difficult to Fix: Difficulty varies depending on the underlying issue. Some fixes may be simple and require minimal effort, while others may require professional assistance.

Can You Drive With This Code: While the vehicle may still be drivable, it is not recommended to drive with this code, as it may result in difficulty starting the vehicle or potential engine damage.

Tools Needed to Use:

OBD-II scanner: To read and clear the codes
Multimeter: To test sensor and wiring integrity
Battery tester: To check battery condition
Scan tool with reprogramming capability: If ECM reprogramming is necessary

Description: Secondary Air Injection System Switching Valve Stuck Open Bank 1. This code indicates a problem with the secondary air injection system’s switching valve.

Symptoms:

Check engine light
Poor engine performance
Increased emissions

Cause: This code can be caused by a stuck or damaged switching valve, a malfunctioning air pump, or problems with the wiring or vacuum lines.

Possible Location: Secondary air injection switching valve, air pump, wiring, vacuum lines

How to Fix the Problem:

Inspect the switching valve for damage or signs of sticking. Replace if necessary.
Check the air pump for proper operation. Replace if necessary.
Inspect wiring and vacuum lines for damage or leaks. Repair or replace if necessary.

How Difficult to Fix: Moderate difficulty. Some repairs may require professional assistance.

Can You Drive With This Code: While driving with this code may not cause immediate issues, it can contribute to increased emissions and reduced engine performance.

Tools Needed to Use:

OBD-II scanner: To read and clear the codes
Multimeter: To test wiring integrity
Vacuum gauge or pump: To check vacuum lines for leaks

DTC P0456 Toyota Tundra

Description: Evaporative Emission System Leak Detected (Very Small Leak). This code indicates a small leak in the vehicle’s evaporative emission control (EVAP) system.

Symptoms:

Check engine light
Fuel odor

Cause: This code can be caused by a loose or damaged gas cap, a cracked or leaking EVAP hose, or a malfunctioning purge valve or vent valve.

Possible Location: Gas cap, EVAP hoses, purge valve, vent valve

How to Fix the Problem:

Inspect and tighten the gas cap. Replace if damaged or worn.
Check EVAP hoses for cracks or leaks. Repair or replace if necessary.
Test the purge valve and vent valve for proper operation. Replace if necessary.

How Difficult to Fix: Easy to moderate difficulty, depending on the location of the leak or malfunction.

Can You Drive With This Code: Driving with this code should not cause immediate issues, but it may contribute to increased emissions and fuel odor.

Tools Needed to Use:

OBD-II scanner: To read and clear the codes
Smoke machine: To help locate leaks in the EVAP system
Multimeter: To test valve operation

Toyota Tundra U0100

Description: Lost Communication with ECM/PCM. This code indicates that the vehicle’s communication network has lost contact with the Engine Control Module (ECM) or Powertrain Control Module (PCM).

Symptoms:

Check engine light
Transmission shifting issues
Poor engine performance
Stalling or hesitation
No start condition

Cause: This code can be caused by a malfunctioning ECM or PCM, damaged wiring, or a faulty communication module.

Possible Location: ECM, PCM, wiring, communication module

How to Fix the Problem:

Check for other DTCs that may provide more information about the specific issue.
Inspect wiring and connections between the ECM/PCM and communication module for damage or corrosion.
Test the communication module for proper operation.
If necessary, reprogram or replace the ECM or PCM.

How Difficult to Fix: Difficulty varies depending on the underlying issue. Some fixes may be simple and require minimal effort, while others may require professional assistance.

Can You Drive With This Code: It is not recommended to drive with this code, as it may result in poor performance, transmission issues, and potential damage to the engine or drivetrain.

Tools Needed to Use:

OBD-II scanner: To read and clear the codes
Multimeter: To test wiring integrity and communication module operation
Scan tool with reprogramming capability: If ECM/PCM reprogramming is necessary

WORDS BY ERWIN SALARDA

Being aware of the top 5 most common OBD diagnostic trouble codes for the Toyota Tundra can help you prevent potential damage, reduce costly repairs, and maintain your vehicle’s overall performance. Addressing these issues promptly and effectively is crucial to enjoying a reliable and efficient driving experience. Remember that regular maintenance, proper diagnostic tools, and professional assistance when needed can go a long way in preserving the health of your Toyota Tundra.