TCM Power Input Signal Intermittent

Severity

High

Can I keep driving?

Avoid extended driving; visit a service soon.

How is this code read?

This is a standard OBD-II code; any basic scanner reads it on vehicles built after 2004.

PPowertrain
0Generic code
8Transmission
84Sequence number

What does it mean?

The transmission control module (TCM) can be built into the engine control module or it can be a separate unit. Proper TCM operation is vital to vehicle function. The TCM receives input from several different sensors and uses that information to determine control of various outputs, such as the shift solenoids and torque converter clutch solenoid. An example of a transmission control module Code P0884 indicates the TCM has intermittently lost either power or ground.

Symptoms

Likely causes

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This information follows the generic OBD-II definition and does not replace a vehicle-specific diagnosis. The severity rating is rule-based; an authorised diagnostic reading is required for a definitive answer.