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U0402 fault code: what it means

U0402: Implausible/invalid data from the TCM, logged by the engine computer (Cherokee, Renegade). Usually cleared by FCA PCM/TCM software.

Network (communication between modules) · Minor

Usual causes, most likely first

  1. PCM/TCM software
  2. TCM fault
  3. CAN fault

U0402 by make

Jeep

Implausible/invalid data from the TCM, logged by the engine computer (Cherokee, Renegade). Usually cleared by FCA PCM/TCM software.

Usual causes: PCM/TCM software; TCM fault; CAN fault

Not sure what U0402 means on your car? Ask Credov.

Before you clear it

Write the code down or photograph the scanner first. A code that comes straight back after clearing points to a fault that is still there. A car whose codes were cleared just before you arrived may be hiding one: the scanner's readiness monitors show "not ready" for a while after codes are cleared.

Researched by Credov from manufacturer and workshop sources. A fault code points to where a fault may be; a workshop confirms it with a diagnosis. Browse all fault codes.