B2106 — Throttle Position Input Out of Range High #

Note: The description for DTC B2106 may vary depending on the vehicle manufacturer (OEM). Always refer to your OEM service documentation for the most accurate definition.

• B2106 — Throttle Position Signal High (Ford)
• B2106 — Throttle Position Circuit High Input (Nissan)
• B2106 — Throttle Position Sensor Signal High (Mazda)

Summary of Code B2106 #

DTC B2106 indicates that the Throttle Position Sensor (TPS) is sending a signal voltage to the vehicle’s Electronic Control Unit (ECU) that is higher than the expected range. The throttle position sensor monitors the angle of the throttle plate, translating pedal movement into an electrical signal. When this signal exceeds the specified limit, the ECU suspects a fault in the sensor circuit or related components. This code is primarily associated with drive-by-wire throttle systems, where electronic signals, rather than a physical cable, control the throttle. If left unchecked, B2106 can lead to erratic engine performance or limp mode activation to protect the engine.

Frequent Symptoms for Code B2106 #

A vehicle experiencing a B2106 code may display a variety of performance issues. Most commonly, these symptoms relate to the engine’s inability to accurately interpret driver input for acceleration, resulting in unpredictable operation.

• Check Engine Light or Service Engine Soon light illuminated
• Engine hesitation or stumbling upon acceleration
• Reduced throttle response or acceleration
• Erratic or high idle speed
• Limp home mode activation (reduced power)
• Failure to start in rare cases

Probable Causes for Code B2106 (Most to Least Common) #

Several issues can trigger a B2106 code. These range from simple electrical faults to more complex sensor or ECU failures. The causes are listed below in order of likelihood:

1. Faulty or failing Throttle Position Sensor (TPS)
2. Open, shorted, or corroded wiring/connectors in the TPS circuit
3. Poor electrical ground to the TPS
4. ECU receiving incorrect reference voltage
5. Defective ECU (rare)
6. Mechanical binding in the throttle body assembly

Step-by-Step Diagnostic for Code B2106 #

Diagnosing a B2106 code requires a methodical approach to avoid unnecessary part replacement. Follow these steps to pinpoint the root cause:

• Use a scan tool to confirm the presence of B2106 and note any related codes.
• Visually inspect the throttle position sensor and its wiring for damage, corrosion, or loose connections.
• Check the TPS connector for secure fit and any signs of moisture or contamination.
• With a multimeter, measure the TPS signal wire voltage at closed and open throttle; compare to OEM specs.
• Test for proper reference voltage (typically 5V) and ground at the TPS connector.
• If wiring and voltages are within spec, use a scan tool to graph the live TPS signal for erratic spikes or out-of-range readings.
• If all else checks out, suspect a faulty ECU or throttle body assembly. Follow OEM-specific tests to confirm.

Possible Repairs for Code B2106 #

Repairing a B2106 code depends entirely on the identified cause. Always address the root issue to prevent code recurrence:

• Replace the Throttle Position Sensor if found faulty.
• Repair or replace damaged TPS wiring or connectors.
• Clean electrical contacts and ensure secure connections.
• Restore proper ground to the TPS circuit.
• Correct reference voltage issues, such as repairing wiring between ECU and sensor.
• Replace or reprogram the ECU if deemed defective (rare).
• Clean or replace the throttle body if mechanical binding is found.

Is It Safe to Drive with Code B2106? #

Driving with code B2106 is generally not recommended. While some vehicles may continue to operate with limited throttle response, the risk of sudden loss of power, poor acceleration, or even stalling is significant. Additionally, the vehicle may enter limp mode, limiting speed and making highway driving unsafe. Immediate diagnosis and repair are advised to avoid further complications and ensure safe vehicle operation.

Vehicles Most Commonly Affected by Code B2106 #

While B2106 is a generic code, it is more frequently reported on certain makes and models—especially those using drive-by-wire throttle systems. The following vehicles are commonly associated with this DTC:

• Ford (Focus, Fusion, F-150, Escape, Explorer)
• Nissan (Altima, Sentra, Frontier, Xterra)
• Mazda (Mazda3, Mazda6, CX-5)
• Infiniti (G35, FX35, QX4)
• Toyota (Corolla, Camry, Tacoma — less commonly)

Common Mistakes & Best Practices for Code B2106 #

Misdiagnosis can lead to wasted parts and labor. To avoid common pitfalls when dealing with B2106:

• Don’t replace the TPS without first confirming power, ground, and reference voltage integrity.
• Avoid overlooking simple wiring or connector issues, which are often the real culprit.
• After any repair, always clear the code and perform a road test to verify resolution.
• Use OEM service info for pinouts and proper voltage ranges—aftermarket data may differ.
• Do not ignore related codes (e.g., P0120, P0220) that may provide more context for the root cause.

Quick FAQ: Code B2106 #

Q: Can a dirty throttle body cause B2106?
A: While rare, heavy carbon buildup can cause the throttle plate to stick, leading to abnormal TPS readings. However, most B2106 codes are due to electrical faults rather than mechanical issues.

Q: Will unplugging the battery clear B2106?
A: Disconnecting the battery may temporarily clear the code, but it will return if the underlying issue is not fixed. Always address the root cause before clearing codes.