P0141 on a GMC: Causes, Fixes & Repair Cost

🟢 Low severity · drivable

The truck or SUV stays drivable because the heater only affects sensor warm-up speed, not engine performance.

What P0141 means on a GMC

On a GMC, P0141 means the heater in the bank 1 rear oxygen sensor isn't working. The rear sensor monitors the catalytic converter and doesn't adjust fuel, so the truck or SUV keeps running normally.

Is P0141 common on GMCs?

Higher-mileage GMC models like the Sierra, Terrain, and Acadia get this code as rear sensors age. Corrosion in the connector or wiring is a common cause on trucks that see salt and moisture, so check that area before replacing the sensor.

Commonly reported on: Sierra, Terrain, Acadia, Yukon.

Symptoms

Check engine light is on
Emissions test may fail
Slightly reduced fuel economy
No drivability issues

Common causes

most common: Heater element burned out inside the rear sensor
common: Blown oxygen sensor heater fuse
common: Corroded wiring or connector from salt and moisture
less common: Damaged wiring from road debris

How to fix it

Fix	DIY?	Typical cost
Test the heater circuit with a multimeter to confirm the fault	Yes	$10–60
Replace the bank 1 rear oxygen sensor	Yes	$70–220
Repair corroded wiring or the sensor connector	Yes	$20–150
Have a shop replace the sensor including labor	Mechanic	$140–370