Toyota Tundra 30CL5200.cuw Engine Control Calibration

30CL5200.cuw is a Toyota Tundra engine control calibration associated with service bulletins for secondary air injection and engine-off timer diagnostic codes. The engine control module manages engine operation and monitors emissions-related systems, including the secondary air injection system. The calibration identifier in Toyota service records is 30CL5200.

Secondary air injection diagnostics

Toyota identifies 30CL5200 as an updated calibration in T-SB-0079-16 and T-TCI-4465, which address an illuminated malfunction indicator light with codes P2440 or P2442. These codes concern secondary air injection switching valves detected as stuck open. The system supplies air to the exhaust during appropriate operating conditions to help reduce emissions, particularly after a cold start.

A warning light and one of these codes point a technician toward the air injection system and its controls. They do not, by themselves, establish that a valve or the engine control module needs replacement. The bulletins document a calibration update associated with the condition rather than defining every change in the file.

Engine-off timer bulletin

For the 2014 Toyota Tundra, T-SB-0146-16 also lists 30CL5200 as an updated calibration for a malfunction indicator light with code P2610. This code concerns the engine control module's internal engine-off timer, which tracks elapsed time after the engine is switched off. That information supports control and diagnostic functions that depend on how long the engine has been stopped.

The air injection bulletins cover 2014–2016 Tundra models, while the P2610 bulletin covers the 2014 Tundra. Those model lists describe bulletin scope, not guaranteed applicability of this calibration to every vehicle in each range.