All codes/U016B

U016B

Lost Communication With A/C Compressor Control Module

Moderate severity

ECU lost CAN communication with the A/C compressor control module (electric A/C compressor on hybrids/EVs).

Common causes

Module unpowered
One of the most commonly reported causes for this code — check this first.
high
Typical part cost: $170-1650
Gateway module routing CAN messages incorrectly
Less common, but worth ruling out after the more likely causes.
low
Typical part cost: $170-1650
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First things to check

1Confirm the code with a scan tool and check for additional related codes.
2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.

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Related codes

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Frequently asked questions

What does U016B mean?

U016B means "Lost Communication With A/C Compressor Control Module". It is a generic OBD-II code that points to a fault in the network / communication.

What are the most common causes of U016B?

module unpowered; gateway module routing can messages incorrectly; can terminating resistor (120 ω) drifted out of spec — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.

Can I keep driving with this code?

The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical. Use the Wrenchify app for a full diagnosis specific to your vehicle.

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