What Does P212D Mean?
The PCM has detected an abnormally high voltage signal from Throttle Position Sensor G circuit. This indicates a circuit open condition or voltage signal exceeding normal operating range.
Safety Warning
Vehicle will likely enter limp mode with severely restricted throttle operation. May cause sudden power loss in traffic creating dangerous conditions.
Common Causes
35%
Throttle body position sensor internal failure or open circuit within sensor
30%
Open circuit in TPS signal wire or poor connection at connector
20%
Corroded or damaged connector terminals causing high resistance
10%
Loss of sensor ground causing reference voltage pull-up
5%
Failed PCM with internal pull-up circuit malfunction
Diagnostic Steps
1
Step 1: Inspect throttle body connector for corrosion, pushed-out pins, or loose connection; wiggle test while monitoring live data
2
Step 2: Backprobe TPS G signal wire and verify voltage (should show 5V with connector disconnected if circuit is open)
3
Step 3: Check sensor ground circuit continuity and verify less than 0.5 ohms resistance to battery negative
4
Step 4: Test 5V reference voltage supply to throttle body (should be stable 4.8-5.2V with key on, engine off)
5
Step 5: If wiring and power/ground are good, replace throttle body assembly
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
The PCM has detected an abnormally high voltage signal from Throttle Position Sensor G circuit. This indicates a circuit open condition or voltage signal exceeding normal operating range.
The most common cause of P212D (Throttle Position Sensor/Switch "G" Circuit High) is: Throttle body position sensor internal failure or open circuit within sensor
Typical repair costs for P212D range from $150 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle will likely enter limp mode with severely restricted throttle operation. May cause sudden power loss in traffic creating dangerous conditions.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P212D 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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