What Does B2106 Mean?
This code indicates the Body Control Module (BCM) has detected a voltage signal from the throttle position sensor or input circuit that exceeds the expected maximum threshold. The BCM monitors throttle position as part of body control functions like cruise control, traction control integration, or engine immobilizer systems. This high voltage reading suggests either a short to voltage in the wiring, a faulty sensor, or an internal BCM issue with signal processing.
Common Causes
35%
Throttle position sensor internal failure or contamination causing erratic high voltage output
30%
Wiring harness short to voltage or chafed insulation in TPS signal circuit
20%
Poor electrical connection or corrosion at TPS connector causing intermittent high resistance
15%
Body Control Module internal fault or calibration issue with TPS input processing
Diagnostic Steps
1
Step 1: Perform visual inspection of throttle position sensor connector and wiring harness for physical damage, corrosion, bent pins, or evidence of moisture intrusion. Check for proper connector seating and locking mechanism engagement.
2
Step 2: Using a digital multimeter, backprobe the TPS signal wire at the sensor connector with key on engine off (KOEO) and measure voltage. Expected range is typically 0.5-4.5V; readings above 4.8V confirm high input condition. Compare reference voltage (typically 5V) and ground circuits for proper voltage.
3
Step 3: Disconnect TPS connector and measure resistance across sensor terminals while manually moving throttle blade from closed to wide open throttle. Resistance should change smoothly without spikes or dropouts (typically 1-5k ohms range). Erratic readings indicate sensor failure.
4
Step 4: With TPS disconnected, inspect wiring from sensor to BCM for chafing, pinch points, or routing near high-heat sources. Use multimeter to check for continuity to ground or voltage on signal wire (should show infinite resistance when disconnected).
5
Step 5: If wiring and sensor test normal, substitute a known-good TPS or clear codes and monitor live data during throttle movement to verify if code returns. Consistent high voltage with new sensor suggests BCM input circuit fault.
6
Step 6: After repair, clear codes, perform drive cycle including throttle movements from idle to wide open throttle, and verify code does not return. Monitor TPS voltage in live data to confirm readings stay within normal parameters (0.5-4.5V).
Estimated Repair Cost
$120 - $650
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected a voltage signal from the throttle position sensor or input circuit that exceeds the expected maximum threshold. The BCM monitors throttle position as part of body control functions like cruise control, traction control integration, or e...
The most common cause of B2106 (Throttle Position Input Out of Range High) is: Throttle position sensor internal failure or contamination causing erratic high voltage output
Typical repair costs for B2106 range from $120 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is generally safe to drive with reduced functionality, but may experience issues with cruise control, traction control intervention, or transmission shift quality. Repair within a few days to avoid potential drivability issues or triggering additional fault codes.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B2106 to identify the root cause.
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Quick Info
Category
Body
System
Body Control System / Throttle Position Monitoring
Difficulty
Type
Generic (SAE)
Recommended Tools
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