OBD-II Code
P1125
Severity
Not yet reviewed
Nobody on our side has assessed this code yet, so we are not going to guess at how serious it is.
Can you drive it
We cannot say
Treat it as unknown until a shop reads it with live data. If the check-engine light is FLASHING, stop driving as soon as it is safe to — that means an active misfire, whatever the code.
Indicative cost (USD)
$80–$550
From this code's diagnostic notes. Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
P1125 on a Toyota means the Throttle Control Motor Circuit (ETCS-i electronic throttle control system, intelligent) has detected an open or short in the throttle motor drive circuit — the H-bridge driver inside the ECM can't get the commanded current through the motor windings.
How a shop works this
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed.
Note every code that is set, not just this one.
Codes that appear together usually narrow the cause faster than any one of them read alone.
Read the freeze frame — the conditions the fault was recorded under.
Cold or warm, idle or load, road speed and engine speed. A fault that only appears cold is a different fault from one that only appears under load, even with the same code on the scanner.
Confirm the fault is current rather than history.
Clear the code and see whether it returns under those same conditions. A code that does not come back may have been logged during a repair, a flat battery, or a bad connection that has since been disturbed.
Then follow the diagnostic notes further down this page, in the order they are written.
They are written in the order a shop works this code, cheapest checks first. Where they name a component, inspect its wiring and connector before replacing it.
If the code comes back after a repair, the underlying fault is still there. That is the point to bring in a scanner with live data and freeze-frame, or a shop that has one.
Common symptoms
- Check engine light
Read the full diagnostic procedureP1125 on a Toyota means the Throttle Control Motor Circuit (ETCS-i electronic throttle control system, intelligent) has detected an open or short in…
P1125 on a Toyota means the Throttle Control Motor Circuit (ETCS-i electronic throttle control system, intelligent) has detected an open or short in the throttle motor drive circuit — the H-bridge driver inside the ECM can't get the commanded current through the motor windings. ETCS-i uses a brushed DC motor inside the throttle body that runs typically 0.5-3A through an H-bridge driver, with the ECM monitoring motor current as a closed-loop signal; when commanded current and measured current diverge by more than the FSM threshold (usually >0.3A for >100ms) P1125 sets and the system falls back to limp-home idle of around 1,000-1,200 RPM with no pedal response above ~30% throttle.
Cheapest-first ladder
- scan live data for commanded throttle blade angle versus actual throttle position sensor (TPS) reading — a healthy ETCS-i tracks within <5 degrees deviation across the full 0-90 degree blade sweep; if commanded reads 45 degrees and actual reads 8 degrees while motor current is pinned at 3A, the motor is binding or the blade is carbon-stuck.
- Pull the throttle body, inspect the bore and back side of the blade for carbon buildup — Toyota ETCS-i throttle bodies foul with carbon at 80K-120K mi and the blade physically can't open against the deposits, which the ECM reads as a motor-circuit fault.
- Ohm the motor windings at the connector (should read ~1-5 ohms cold per FSM); open circuit means the motor is dead, very low resistance means a shorted winding. Expensive-misdiagnosis caveat: do the throttle body re-learn AFTER cleaning the bore — Toyota ETCS-i throttle bodies foul with carbon at 80K-120K mi; cleaning + relearn restores adaptation without replacing the $400 throttle body, but skipping the relearn after a clean leaves the ECM with stale adaptation values and the code can come right back.
Vehicle-specific patterns2002-2009 Toyota Camry/Solara with the 2AZ-FE 2.4L is the most common P1125 ticket — the throttle bore cokes up at the PCV inlet side and the blade h…
- 2002-2009Toyota Camry/Solara with the 2AZ-FE 2.4L is the most common P1125 ticket — the throttle bore cokes up at the PCV inlet side and the blade hangs.
- 2004-2010Highlander with the 2GR-FE 3.5L V6 and Sienna 3.3/3.5L throw P1125 with similar carbon-fouling timing (~100K mi) and respond to a clean + relearn 80% of the time.
- 2006-2012RAV4 with the 2AR-FE 2.5L throws P1125 with a slightly different pattern — the failure tends to be the motor itself (brushes worn) rather than the bore, so cleaning helps less and a throttle body replacement is more often the durable fix.
- 2001-2006Lexus IS/GS with the 2JZ-GE and 3GR-FE family throw P1125 from connector corrosion at the throttle body more than from carbon.
Estimated repair$80 to $550.
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