Faulty throttle position sensor or accelerator pedal position sensor (sensor F or G); Wiring damage such as chafed, corroded, or broken wires in the sensor circuit; Loose or corroded electrical connectors at the sensor or ECM; Poor ground connection for the sensor circuit; Failed ECM (rare but possible); Aftermarket electronic throttle controller or piggyback module interfering with signals

DTC codes / P21xx · Fuel and air metering / P212F

P212FThrottle/Pedal Position Sensor/Switch F/G Voltage Correlation

P212F indicates that the engine control module (ECM) has detected a voltage correlation error between throttle or pedal position sensor/switch F and sensor/switch G. The ECM compares the two signals as a plausibility check, and when their voltages do not track within the expected range, it stores this code and typically illuminates the check engine light.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering

Symptoms you may notice

Check engine light illuminated, often with no other noticeable symptoms
Reduced engine power or limp mode, limiting acceleration
Hesitation or stumble when pressing the accelerator pedal
Unresponsive or delayed throttle response
Rough idle or erratic engine speed
Cruise control may become inoperative

Common causes, most likely first

Faulty throttle position sensor or accelerator pedal position sensor (sensor F or G)
Wiring damage such as chafed, corroded, or broken wires in the sensor circuit
Loose or corroded electrical connectors at the sensor or ECM
Poor ground connection for the sensor circuit
Failed ECM (rare but possible)
Aftermarket electronic throttle controller or piggyback module interfering with signals

How to diagnose and fix it

Scan all modules and record freeze-frame data to understand when the code sets
Visually inspect the throttle body and pedal sensor connectors for corrosion or damage
Check sensor reference voltage and ground at the sensor F and G connectors with a multimeter
Perform a wiggle test on the harness while monitoring sensor voltages to find intermittent faults
Compare live sensor F and G voltages on a scan tool while slowly pressing the pedal; they should track proportionally
If wiring and connectors are good, replace the faulty sensor or the throttle body assembly as required
Clear codes and perform a throttle relearn or idle relearn procedure if applicable

What the correlation code really means

This code is a plausibility fault, not a hard circuit failure, so the sensors may still produce believable voltages individually while failing to agree with each other.
A dirty throttle body or carbon buildup can cause the blade to stick slightly, making sensor F and G signals diverge under certain conditions without any sensor being electrically defective.
Aftermarket throttle controllers or pedal boosters that modify pedal signals are a common cause of correlation codes on otherwise healthy vehicles.
Intermittent harness rub-through near the throttle body or pedal assembly often sets this code only on rough roads or during temperature swings, so a static meter test may pass.
Do not replace the ECM based on this code alone; verify sensor signal integrity and ground quality first, because ECM failure is extremely rare.

Can I keep driving with P212F?

You can usually drive the vehicle to a repair shop, but expect reduced power and avoid heavy acceleration or highway merging until the fault is repaired. If the vehicle enters limp mode or the throttle becomes unresponsive, stop driving and have it towed.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.