U041F: Invalid Data Received From Throttle Actuator B Control Module

What it means

A control module received data from Throttle Actuator B Control Module that it judged invalid or implausible. This code identifies the rejected data, but does not by itself identify the cause.

At a glance

• Usually lights the warning light of the system that lost communication
• Affects emissions; the car can fail an emissions test
• The engine or gearbox may go into limp mode

How it works

Throttle Actuator B Control Module controls or reports a designated throttle actuator channel, depending on the vehicle's design. U041F sets when another module receives data from that B module that fails its plausibility checks; it does not by itself identify a throttle motor failure.

Common causes

Most likely first.

1. Fault or implausible input at Throttle Actuator B Control Module
2. Damaged or loose network wiring or connector
3. Module power, ground, or programming issue

Symptoms

• Check-engine light may illuminate
• Engine power or throttle functions may be limited
• Other communication codes

How to diagnose it

1. Scan all modules and preserve freeze-frame data, throttle-related codes, and communication codes to identify whether the B module fault occurred with a voltage or network problem.
2. Check for reduced-power warnings, poor throttle response, or an engine that will not respond normally, and avoid assuming actuator A is the affected channel.
3. Inspect the B module's connector and wiring for loose terminals, corrosion, abrasion, heat damage, or water intrusion.
4. Check the B module's power and ground circuits under the manufacturer's test conditions before testing or replacing throttle parts.
5. Compare live data for throttle actuator B with related throttle and pedal data, then test its network and control circuits to the manufacturer's specification.
6. If circuits and supply pass, check for relevant software or calibration updates before considering module replacement.

Common fixes

• Reconnect or repair a loose or damaged throttle actuator B connector.
• Repair chafed or corroded wiring to the B control module.
• Correct a power or ground fault affecting the B module.
• Install an applicable software or calibration update.
• Replace the B control module if its supply and circuits are correct but its data remains implausible.

Can I keep driving?

If throttle response is reduced or unpredictable, avoid driving in traffic or attempting fast acceleration; arrange a safe stop if the vehicle cannot maintain speed reliably. Continuing to drive with limited throttle control can leave you unable to accelerate when needed.