Faulty accelerator pedal assembly (APP sensor 2 failed internally or worn track); Damaged wiring to the pedal sensor: chafing, open circuit, or short to voltage or ground on the sensor 2 signal, reference or ground wires; Corroded, loose or contaminated connector terminals at the pedal or the control module; Poor sensor ground or 5 V reference supply shared with other sensors; Water ingress or contamination in the pedal connector or footwell area; Fault inside the engine control module.

P1280

Accelerator Pedal Position APP Sensor 2 Circuit.

Saturn
Powertrain
Manufacturer code
Medium severity

How this code is built

P: SystemPowertrain
1: Defined byThe manufacturer
2: AreaFuel and air metering (injector circuit)
80: FaultThe specific fault in that area

What it means

On a Saturn, P1280 means the engine control module has detected a fault in the Accelerator Pedal Position (APP) sensor 2 circuit. The module compares the signals from the pedal's separate sensors and checks that each stays within its expected voltage range. If sensor 2 reads out of range, or does not agree with sensor 1, the code is set and the throttle response is usually restricted.

Symptoms

Engine warning light on
Reduced engine power or limp-home mode
Poor or delayed throttle response
Engine stuck at a high or low idle
Hesitation or surging when pulling away

Possible causes

Faulty accelerator pedal assembly (APP sensor 2 failed internally or worn track)likely
Damaged wiring to the pedal sensor: chafing, open circuit, or short to voltage or ground on the sensor 2 signal, reference or ground wireslikely
Corroded, loose or contaminated connector terminals at the pedal or the control modulelikely
Poor sensor ground or 5 V reference supply shared with other sensorspossible
Water ingress or contamination in the pedal connector or footwell areapossible
Fault inside the engine control modulerare

How to diagnose

Read all stored and pending codes and note the freeze frame data, then check for other sensor reference or throttle codes that point to a shared supply fault.
Inspect the pedal connector and wiring from the pedal to the engine control module for chafing, water, corrosion, bent or pushed-back pins.
With a scan tool, watch APP sensor 1 and 2 values as the pedal is moved slowly from rest to full travel, looking for dropouts, jumps or the two signals not tracking each other.
Check the 5 V reference, signal and ground at the pedal connector against the manufacturer's wiring diagram and specified voltages for your model and engine.
Perform voltage-drop and continuity tests on the sensor 2 signal, reference and ground wires, and check for shorts to power or ground.
Check that the pedal moves freely, with no floor mat or debris restricting it, and that nothing is rubbing on the sensor.
If wiring and supplies are good, test or substitute the pedal assembly, and only consider the control module after everything else is proved sound.

How to fix

Repair or replace damaged wiring and fix any open or shorted circuit in the sensor 2 wires.
Clean or replace corroded or damaged connector terminals and secure the connections.
Replace the accelerator pedal assembly if the sensor signal is erratic or out of range.
Restore a good ground or 5 V reference supply if a shared fault is found.
Dry out and seal any water ingress, then repair the cause of the leak.
Replace or reprogram the engine control module only if confirmed faulty, following the manufacturer's procedure.

Can I keep driving?

Medium severity

The car may enter reduced power mode and respond unpredictably to the pedal, which can be unsafe in traffic. Drive only short distances with care if needed and get it fixed soon.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.