P2127 Fault Code

Throttle/Pedal Position Sensor/Switch E Circuit Low

• What does that mean?
• Symptoms
• Causes
• Solutions

The P2127 code indicates that the Throttle/Pedal Position Sensor/Switch E Circuit has a low voltage condition. This sensor is crucial for monitoring the position of the throttle and ensuring optimal engine performance. When this code is triggered, it typically signifies a malfunction with the sensor, its wiring, or connectors, leading the engine control unit (ECU) to receive incorrect information about the throttle position.

• The throttle position sensor measures how far the throttle is open.
• It communicates this data to the ECU to adjust fuel delivery and ignition timing.
• A low voltage reading might be caused by a faulty sensor, damaged wiring, or poor connections.

What are the symptoms of the P2127 code?

Symptoms that may accompany the P2127 code are:

• Reduced engine power or hesitation during acceleration.
• Check Engine Light illuminated on the dashboard.
• Erratic engine performance or stalling.
• Unusual shifts in automatic transmission vehicles.
• Poor fuel efficiency due to improper fuel management.

What causes the P2127 code?

Common causes for the P2127 code include:

• Faulty throttle position sensor.
• Damaged wiring or connectors in the throttle position sensor circuit.
• Corrosion in the electrical connectors.
• A problem with the Engine Control Module (ECM) itself.
• Battery voltage issues or poor grounds affecting sensor operation.

How to fix P2127?

To resolve the P2127 code, the following steps should be taken:

• Inspect the throttle position sensor and its wiring for damage or corrosion.
• Test the sensor's voltage output to ensure it meets manufacturer specifications.
• Repair or replace any damaged wiring or connectors.
• Replace the throttle position sensor if it is found to be faulty.
• Clear the trouble codes from the ECU and perform a test drive to confirm the fix.