U0402 — OBD-II trouble code

A network / communication OBD-II trouble code. Below are the vehicles and failure patterns where owners report it, drawn from NHTSA complaints.

In ProblemsByVin's analysis of the NHTSA owner-complaint record, owners cite U0402 across 12 vehicle failure patterns. Diagnostic codes in complaints are reported by owners and are unverified — they point to where this code shows up, not a confirmed diagnosis. Open a page below for the full pattern (symptoms, mileage, repair costs owners cite).

Vehicles where owners report U0402 12 patterns

2021 RAM 1500

powertrain — Unexpected stalling with automatic park shift and e-brake engagement

2019 RAM 1500

powertrain — Transmission dropping out of gear (falls into neutral while driving)

2018 Chrysler 300

electrical — Adaptive Cruise Control System Malfunction

2018 Jeep Renegade

powertrain — Complete engine shutdown/stalling while driving

2017 Jeep Cherokee

powertrain — Transmission Shift Malfunction – Failure to Engage, Harsh Shifts, and Jerking

2017 RAM 1500

steering — Electronic Power Steering (EPS) Loss of Assist / Complete Failure

2016 Jeep Renegade

powertrain — Transmission loss of power and delayed response

2015 Jeep Renegade

powertrain — Transmission shifting faults and loss of power

2014 Jeep Cherokee

powertrain — 9-Speed Transmission - Hesitation, Surging, and Erratic Shifting

2014 Jeep Cherokee

engine — Excessive oil consumption causing engine stall

2009 Dodge Caliber

powertrain — CVT Transmission Overheating and Limp Mode

2008 Dodge Caliber

powertrain — CVT Transmission Failure

Codes are pulled from what owners wrote in their NHTSA filings — they're allegations, not a shop diagnosis. Always confirm with a live scan. Browse all diagnostic codes →