What Does P212B Mean?
The PCM has detected that throttle position sensor 'G' circuit signal is outside expected range or not performing correctly relative to other throttle position sensors. This indicates correlation or rationality issues between redundant TPS circuits.
Safety Warning
Vehicle may experience erratic idle, stalling, or sudden limp mode activation. Reduced power and unpredictable behavior make driving hazardous.
Common Causes
35%
Failing throttle position sensor with drift or incorrect calibration
25%
Mechanical issues with throttle blade binding or sticking
20%
Intermittent wiring or connector issues
15%
Voltage reference or ground circuit problems
5%
Throttle body relearn procedure required after service
Diagnostic Steps
1
Step 1: Monitor all throttle position sensor voltages simultaneously; compare for proper correlation and ratio
2
Step 2: Remove intake duct and manually operate throttle blade; check for binding, carbon buildup, or rough spots
3
Step 3: Perform throttle body cleaning and relearn procedure per manufacturer specifications
4
Step 4: Check voltage stability on reference and ground circuits under various load conditions
5
Step 5: Compare actual throttle angle to commanded throttle angle; large discrepancies indicate mechanical or sensor issues
Estimated Repair Cost
$150 - $850
Parts + labor, varies by vehicle and location
The PCM has detected that throttle position sensor 'G' circuit signal is outside expected range or not performing correctly relative to other throttle position sensors. This indicates correlation or rationality issues between redundant TPS circuits.
The most common cause of P212B (Throttle Position Sensor/Switch "G" Circuit Range/Performance) is: Failing throttle position sensor with drift or incorrect calibration
Typical repair costs for P212B range from $150 to $850, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle may experience erratic idle, stalling, or sudden limp mode activation. Reduced power and unpredictable behavior make driving hazardous.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P212B to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
Electronic Throttle Control
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
