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P2127

Throttle/Pedal Position Sensor/Switch E Circuit Low

Throttle / pedal position Generic OBD-II Medium

What it means

P2127 means the PCM sees the "E" throttle/pedal position sensor signal reading too low — usually a short to ground, an open reference wire, or a failing sensor. Because the PCM relies on this signal to judge driver demand, it often limits power until the circuit reads correctly again.

Medium

Can I keep driving? Usually driveable, but the car may fall into reduced power or limp mode, so keep speeds moderate until it's repaired.

Common symptoms

What you'll notice

Common causes

Most likely first

  1. Short to ground or open in the sensor 'E' signal or reference wiring
  2. Poor connector contact or corrosion at the sensor plug
  3. Faulty throttle/pedal position sensor 'E'
  4. Faulty engine control module (ECM)

How to diagnose & fix

Work through it in order

  1. Read freeze-frame data and check for companion codes (P2128, P2122, P2138).
  2. Inspect the sensor connector and wiring for damage, corrosion, and pins pushed back.
  3. With key on, engine off, confirm a steady 5-volt reference and a good ground; a low signal usually points to a short-to-ground or open reference.
  4. Back-probe the signal wire and compare to spec while sweeping the pedal/throttle.
  5. If wiring checks out, replace the position sensor; consider the ECM only after wiring and sensor are ruled out.

FAQ

Quick answers

Is it safe to drive with P2127?+
For short trips, but expect limited power. Because it involves throttle/pedal position, have it diagnosed soon.
Can I just clear P2127?+
It returns quickly if the low-voltage circuit fault is still present; fix the wiring or sensor first.

Related codes

Often seen with P2127

P2128Throttle/Pedal Position Sensor/Switch E CiP2122Throttle/Pedal Position Sensor/Switch D CiP2123Throttle/Pedal Position Sensor/Switch D CiP2138Throttle/Pedal Position Sensor/Switch D/E

Read & clear P2127 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

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✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX