Battery disconnected or discharged, or the control module reset, so the learned throttle position was lost and not relearned; Throttle body or control module replaced or cleaned without carrying out the throttle relearn procedure; Faulty throttle position sensor or throttle body motor/position circuit preventing the learn from completing; Wiring or connector fault (chafing, corrosion, loose pin) in the throttle position sensor circuit, reference or ground; Low or unstable system voltage from a weak battery or charging fault interrupting the learn; Carbon build-up in the throttle body bore stopping the plate reaching its normal closed position; Internal control module fault.

P1526

TP Sensor Learn Not Complete.

Saturn
Powertrain
Manufacturer code
Low severity

How this code is built

P: SystemPowertrain
1: Defined byThe manufacturer
5: AreaVehicle speed, idle control and auxiliary inputs
26: FaultThe specific fault in that area

What it means

On a Saturn, P1526 means the engine control module has not completed its throttle position (TP) sensor learn procedure. The module needs to learn the closed-throttle position of the throttle body, and it either lost that learned value or could not finish the relearn. This usually follows a battery disconnect, a control module or throttle body replacement, or a fault that interrupted the learn.

Symptoms

Check engine light on
Unstable or hunting idle speed
Idle too high or too low, or stalling when coming to a stop
Hesitation or poor throttle response
Reduced power or limited throttle response in some cases

Possible causes

Battery disconnected or discharged, or the control module reset, so the learned throttle position was lost and not relearnedlikely
Throttle body or control module replaced or cleaned without carrying out the throttle relearn procedurelikely
Faulty throttle position sensor or throttle body motor/position circuit preventing the learn from completingpossible
Wiring or connector fault (chafing, corrosion, loose pin) in the throttle position sensor circuit, reference or groundpossible
Low or unstable system voltage from a weak battery or charging fault interrupting the learnpossible
Carbon build-up in the throttle body bore stopping the plate reaching its normal closed positionpossible
Internal control module faultrare

How to diagnose

Read all stored codes and freeze frame data, and note whether other throttle, TP sensor or voltage codes are present
Ask about recent work: battery disconnection, throttle body cleaning or replacement, or control module replacement
Test battery condition and charging voltage, as the learn needs stable voltage
Inspect the throttle body wiring and connector for damage, corrosion, water ingress and bent or loose pins
Check the throttle body bore and plate for heavy carbon build-up or sticking, and that the plate returns fully closed
With a scan tool, watch TP sensor readings at closed and open throttle for a smooth, plausible sweep with no dropouts
Check reference voltage and ground at the TP sensor connector against the manufacturer's data for the specific model and engine
Carry out the manufacturer's throttle relearn procedure for that model, then clear the code and confirm it does not return

How to fix

Carry out the correct throttle position relearn procedure for the model and engine, following the manufacturer's steps
Repair or replace damaged wiring or connectors in the TP sensor circuit
Replace the throttle body or TP sensor if readings are erratic or out of range, then perform the relearn
Clean the throttle body of carbon deposits with a suitable cleaner, following the manufacturer's guidance, then relearn
Replace a weak battery or repair the charging system fault, then repeat the relearn

Can I keep driving?

Low severity

The car can usually be driven, but idle and throttle response may be rough, so book it in soon. If it stalls or has reduced power, limit driving until it is sorted.

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