What Does P212C Mean?
The PCM has detected an abnormally low voltage signal from Throttle Position Sensor G circuit. This sensor provides redundant throttle position data for Electronic Throttle Control (ETC) system validation.
Safety Warning
Vehicle may enter limp mode with reduced power and limited throttle response. May cause unexpected throttle behavior creating a safety hazard.
Common Causes
35%
Throttle body position sensor internal failure or short to ground
30%
Damaged wiring harness or connector pins corroded/backed out between sensor and PCM
20%
Short to ground in TPS signal circuit wiring
10%
Failed PCM unable to properly read sensor voltage
5%
Poor ground connection at throttle body or PCM
Diagnostic Steps
1
Step 1: Inspect throttle body connector for corrosion, damage, or moisture; check pin tension and repair if needed
2
Step 2: Using a DVOM, backprobe the TPS G circuit and verify voltage is within specification (typically 0.5-4.5V at varying throttle positions)
3
Step 3: Check for short to ground by disconnecting throttle body connector and measuring resistance between signal wire and ground (should be infinite/OL)
4
Step 4: Inspect wiring harness from throttle body to PCM for chafing, pinching, or damage near moving components
5
Step 5: If all wiring and connections test good, replace throttle body assembly and retest
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
The PCM has detected an abnormally low voltage signal from Throttle Position Sensor G circuit. This sensor provides redundant throttle position data for Electronic Throttle Control (ETC) system validation.
The most common cause of P212C (Throttle Position Sensor/Switch "G" Circuit Low) is: Throttle body position sensor internal failure or short to ground
Typical repair costs for P212C range from $150 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle may enter limp mode with reduced power and limited throttle response. May cause unexpected throttle behavior creating a safety hazard.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P212C to identify the root cause.
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Quick Info
Category
Powertrain
System
Electronic Throttle Control (ETC)
Difficulty
Type
Generic (SAE)
Recommended Tools
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