What Does P212A Mean?
The PCM has detected a malfunction in throttle position sensor 'G' circuit. This sensor monitors actual throttle blade position on the throttle body and is part of the redundant sensor array for electronic throttle control systems.
Safety Warning
Vehicle may enter limp mode, stall, or experience unpredictable throttle response. Not safe to drive until diagnosed.
Common Causes
40%
Faulty throttle position sensor on throttle body
25%
Damaged wiring or connector at throttle body
20%
Carbon buildup or contamination affecting throttle plate movement
10%
Corroded or loose connector terminals
5%
PCM internal fault
Diagnostic Steps
1
Step 1: Inspect throttle body connector for corrosion, damage, or moisture infiltration
2
Step 2: Backprobe throttle position sensor 'G' circuit and verify 5V reference and ground signals
3
Step 3: Monitor TPS 'G' voltage while manually opening throttle blade; should sweep smoothly from ~0.5V to ~4.5V
4
Step 4: Remove throttle body and inspect for carbon buildup or binding; clean if necessary
5
Step 5: Check wiring continuity between throttle body and PCM; verify no shorts to ground or voltage
Estimated Repair Cost
$200 - $800
Parts + labor, varies by vehicle and location
The PCM has detected a malfunction in throttle position sensor 'G' circuit. This sensor monitors actual throttle blade position on the throttle body and is part of the redundant sensor array for electronic throttle control systems.
The most common cause of P212A (Throttle Position Sensor/Switch "G" Circuit) is: Faulty throttle position sensor on throttle body
Typical repair costs for P212A range from $200 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle may enter limp mode, stall, or experience unpredictable throttle response. Not safe to drive until diagnosed.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P212A to identify the root cause.
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Quick Info
Category
Powertrain
System
Electronic Throttle Control
Difficulty
Type
Generic (SAE)
Recommended Tools
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