Network, generic

U061F Lost Communication With Exhaust Gas Temperature Sensor Bank 1 Sensor 1

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modeNo

Many current exhaust temperature sensors are active: a thermocouple probe, often type N, feeds a small electronics module that turns the reading into SENT or CAN messages, as in the Sensience 22J sensor. U061F means valid messages from the bank 1, position 1 sensor (normally the most upstream one) have stopped. GM's 2025 diesel tables (25OBDG04A and 25OBDG04B) define it for a SENT sensor: any message fault, or messages that are too old, counted in 19 of 25 samples taken every 100 ms once the sensor start-up delay has passed and the engine is not cranking; Type A, so the MIL lights in the first trip. GM also stores a second code tied to the controller input the sensor is wired to. Bentley saw it with U0621 on 2020-on V8 Continental and Flying Spur cars whose harness chafed on a wheel-arch bracket.

Likely causes

Sensor harness rubbing through on a bracket or subframe edge (Bentley V8)

Connector or module of the sensor damaged by exhaust heat

Internal fault of the active sensor that shuts its SENT output off

Missing 5 V supply or ground from the controller

Symptoms

Check engine or emission warning lamp
Further codes for the controller input or the second bank
Particulate filter regeneration may be postponed

Repair estimate

DifficultyMediumDIY possible

Parts and labour€60–450

Time0.5–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

egt sensor bank 1 sensor 1sensor wiring

References: gsi.ext.gm.com, gsi.ext.gm.com, static.nhtsa.gov, sensience.com.