P212F: Throttle/Pedal Position Sensor/Switch F/G Voltage Correlation

What it means

Channels F and G of the throttle/pedal position sensor disagree by more than the allowed tolerance. Drive-by-wire system has lost redundancy and may force limp mode.

At a glance

• Usually lights the check-engine light
• Affects emissions; the car can fail an emissions test
• The engine or gearbox may go into limp mode

How it works

Channels F and G are paired throttle or pedal position signals that let the control module cross-check driver demand or throttle angle. P212F sets when the F and G readings disagree beyond the permitted correlation, which can cause the drive-by-wire system to restrict throttle as a safety response.

Common causes

Most likely first.

1. Worn or damaged sensor track in the throttle or pedal position sensor
2. Poor connector contact or damaged wiring
3. Sensor misalignment or mechanical wear
4. Fault in the throttle control module

Symptoms

• Check engine light on
• Reduced throttle response, possible limp mode
• Hesitation or surging
• Idle too high or too low

How to diagnose it

1. Use a scan tool to save freeze-frame data and graph F and G together while slowly operating the pedal or throttle to identify when their readings diverge.
2. Inspect the relevant pedal or throttle sensor connector and wiring for damaged insulation, loose terminals, corrosion, or moisture affecting either channel.
3. Check that the pedal or throttle assembly is securely mounted and moves freely, since looseness or mechanical wear can upset the relationship between F and G.
4. Test both F and G circuits for continuity, shorts, and poor terminal contact using the wiring diagram and manufacturer's procedure.
5. If the wiring and mechanical assembly pass, compare both sensor outputs with the manufacturer's specifications and follow its diagnostic steps before condemning the control module.

Common fixes

• Clean and secure connector contacts affecting the F and G circuits.
• Repair damaged or poorly connected wiring on either channel.
• Replace the worn pedal or throttle position sensor assembly if F and G fail to track together.
• Correct loose mounting or mechanical wear affecting sensor alignment.
• Repair or replace the throttle control module only if both channels and their circuits pass the manufacturer's checks.

Can I keep driving?

The system may sharply limit throttle or enter limp mode because its redundant position signals disagree. Avoid driving in fast or heavy traffic; if acceleration is restricted or erratic, stop safely and arrange repair.