Faulty throttle position sensor or throttle body assembly giving a high or out-of-range signal; Damaged wiring, chafing or short to voltage on the PWM signal circuit; Corroded, loose or pushed-out pins in the throttle body or control module connectors; Poor ground or reference voltage supply to the sensor; Fault in the engine control module or the module receiving the PWM signal; Outdated control module software where a known issue exists for the model.

P1892

Throttle Position Sensor PWM Signal High.

Saturn
Powertrain
Manufacturer code
Medium severity

How this code is built

P: SystemPowertrain
1: Defined byThe manufacturer
8: AreaTransmission
92: FaultThe specific fault in that area

What it means

P1892 is a GM-family manufacturer code that Saturn uses for Throttle Position Sensor PWM Signal High. The throttle position signal is sent to another control unit as a pulse-width-modulated (PWM) signal, and the receiving module saw that signal sitting higher than expected or above its valid range. The fault could be in the sensor, the wiring between modules, or the module generating the signal, and the exact layout depends on the model and engine.

Symptoms

Check engine light on, possibly with a traction control or service message
Poor or erratic throttle response
Rough or unstable idle
Transmission shifting harshly or at odd times
Reduced engine power or limp-home behaviour
Traction control or stability functions disabled

Possible causes

Faulty throttle position sensor or throttle body assembly giving a high or out-of-range signallikely
Damaged wiring, chafing or short to voltage on the PWM signal circuitlikely
Corroded, loose or pushed-out pins in the throttle body or control module connectorslikely
Poor ground or reference voltage supply to the sensorpossible
Fault in the engine control module or the module receiving the PWM signalrare
Outdated control module software where a known issue exists for the modelrare

How to diagnose

Read all stored and pending codes and freeze frame data, noting load, throttle angle and whether other throttle or traction codes are present
Look up the wiring diagram and confirm how the PWM throttle signal is routed on this model and engine
Visually inspect the throttle body, harness and connectors for damage, water ingress, corrosion and bent or loose pins
Watch the live throttle position reading while slowly opening the throttle, looking for jumps, dropouts or a reading stuck high
Check the sensor reference voltage and ground at the connector with a multimeter
Check the signal wire for shorts to voltage or other circuits, and for continuity end to end with the connector disconnected
Scope or measure the PWM duty cycle at the sensor and at the receiving module, and compare with the specification
Check for software updates or technical bulletins for the model before condemning a control module

How to fix

Replace the throttle position sensor or throttle body assembly if the signal is faulty, and carry out any throttle relearn the manufacturer requires
Repair or replace damaged wiring on the signal, reference or ground circuits
Clean or repair corroded connectors and re-seat or replace loose terminals
Restore a good ground or supply connection where voltage drop is found
Update the control module software if a known fault exists, or repair or replace the module only after wiring and sensor are proven good

Can I keep driving?

Medium severity

The car may be driveable, but throttle response and shifting can be unpredictable, and it may drop into limp-home. Get it checked soon and avoid motorway driving or overtaking until it is fixed.

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