Throttle/Pedal Position Sensor "B" Maximum Stop Performance
P2164 indicates that the throttle or pedal position sensor B is reading at or beyond its maximum calibrated value, suggesting the sensor is stuck at wide-open-throttle position or has failed. This causes the engine control module to lose accurate throttle input data, resulting in driveability issues.
What You Might Notice
- Lack of throttle response
- Limited or no acceleration
- Engine stall at idle
- Hesitation when accelerating
- Cruise control inoperative
Most Common Causes
- 1
Defective throttle position sensor B
The sensor is internally damaged or has failed, causing it to send a maximum voltage signal constantly. This is the most common cause of this code.
- 2
Throttle body malfunction
The throttle plate may be stuck in the open position or the throttle body may have internal damage preventing proper sensor operation.
- 3
Wiring or connector issues
Corroded, damaged, or loose wiring harness connections to the throttle position sensor can cause maximum voltage readings.
- 4
Engine control module (ECM) failure
A faulty ECM may misinterpret sensor signals or have failed output circuits controlling the throttle position sensor circuit.
How to Diagnose It
- 1
Check Defective throttle position sensor B — The sensor is internally damaged or has failed, causing it to send a maximum voltage signal constantly. This is the most common cause of this code.
- 2
Check Throttle body malfunction — The throttle plate may be stuck in the open position or the throttle body may have internal damage preventing proper sensor operation.
- 3
Check Wiring or connector issues — Corroded, damaged, or loose wiring harness connections to the throttle position sensor can cause maximum voltage readings.
- 4
Check Engine control module (ECM) failure — A faulty ECM may misinterpret sensor signals or have failed output circuits controlling the throttle position sensor circuit.
How to Fix It
- 1
Replace throttle position sensor B
Remove and replace the defective throttle position sensor B with a new OEM or quality aftermarket sensor. Reconnect wiring and clear the trouble code after installation.
- 2
Inspect and clean throttle body
Remove the throttle body assembly and inspect for carbon buildup or mechanical damage. Clean thoroughly or replace if damaged, then reinstall and test sensor operation.
- 3
Repair wiring and connectors
Inspect the wiring harness and connector pins for corrosion, damage, or loose connections leading to the throttle position sensor. Repair or replace damaged wiring, and ensure secure connections.
- 4
Replace engine control module
If sensor and wiring are confirmed good, the ECM may be faulty. Reprogram or replace the ECM and recalibrate throttle position sensors according to manufacturer specifications.
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