P2125
Throttle/Pedal Position Sensor/Switch "E" Circuit
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Code P2125 indicates a general fault in the 'E' circuit of the throttle or accelerator pedal position sensor. Modern vehicles use two independent sensor circuits in the gas pedal (commonly labeled 'D' and 'E') for safety redundancy. The engine computer constantly compares their readings — if the 'E' circuit sends a signal that's out of range, erratic, or doesn't correlate with the 'D' circuit, this code is set.
You'll likely experience reduced engine power, erratic throttle behavior, or the vehicle entering limp mode. The throttle may feel sticky, jump forward unexpectedly, or simply not respond when you press the gas pedal. These symptoms can be intermittent, coming and going as you drive, which makes this code particularly frustrating.
The accelerator pedal position sensor is the most commonly replaced component for this code. It's an integrated part of the pedal assembly in most vehicles and costs between $50 and $200 for the part. Before replacing it, inspect the wiring harness and connector carefully — corrosion at the connector or a damaged wire can mimic a sensor failure. The repair is within reach of most DIYers since the pedal assembly is accessible inside the cabin.
Severity
Symptoms
- •Vehicle enters reduced power or limp mode
- •Throttle feels sticky, unresponsive, or jerky
- •Engine hesitates or briefly stalls when pressing the pedal
- •Check Engine Light illuminated
- •Intermittent loss of throttle response, especially at low speeds
Likely Causes
The 'E' circuit is the secondary redundant sensor in the accelerator pedal assembly. When this sensor fails or its output drifts out of specification, the PCM cannot properly correlate both pedal sensor signals and sets this fault code.
The wiring between the gas pedal sensor and the PCM runs through the firewall area and can be damaged by heat, moisture, or rodent activity, causing intermittent or out-of-range signals on the E circuit.
Loose, spread, or corroded terminals in the pedal connector can cause high resistance and voltage drops, especially noticeable in cold weather when metal contracts and contacts become marginal.
An ECM software glitch or internal circuit problem can misinterpret the E circuit signal. A software reflash at the dealer may resolve the code if no hardware fault is found.
Estimated Cost
Professional Repair
Includes parts + labor
Common Fixes
- Inspect and clean the accelerator pedal position sensor connector
- Repair or replace damaged wiring between the pedal sensor and PCM
- Replace the accelerator pedal position sensor assembly
- Reflash the PCM with updated software if no hardware fault is found