OBD-II Code · Fuel & Air
P2110
Throttle Actuator Control System — Forced Limited RPM
Severity
high
Left alone, this one tends to take other parts with it.
Can you drive it
Not for long
Driving on this one risks further damage. Get it to a shop rather than carrying on with it.
Indicative cost (USD)
$100–$600
Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
ECM caps maximum blade opening due to TAC fault; engine runs but power is severely reduced.
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 work the likely-causes list in the order shown.
That order is what a shop checks first for this code — wiring and connections before the component they run to, because a connector costs nothing to inspect and is a common answer.
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
- Top speed ~40-45 mph
- Engine feels restricted
- Check engine light
- Reduced power light
Likely causes
- Carbon-fouled throttle body (ETCS-i)Most common
- Slow blade response
- Clogged throttle-body coolant lines
Read the full diagnostic procedureP2110 means the ECM has thrown the throttle into forced-limited-RPM mode — the engine will run, the pedal will respond, but the ECM caps the maximum…
P2110 means the ECM has thrown the throttle into forced-limited-RPM mode — the engine will run, the pedal will respond, but the ECM caps the maximum throttle blade opening to roughly 30-40% regardless of how far you press the gas. Top speed drops to around 40-45 mph and the engine feels like it's pulling against a parachute. This is the most common limp-mode flavor on Toyota / Lexus ETCS-i platforms and is almost always carbon-related.
The diagnostic is
read freeze-frame to confirm what triggered it (usually a slow blade response that didn't quite reach P2101 threshold), then clean the throttle body. On any ETCS-i engine past 60k miles, the carbon buildup on the blade edge and the bore creates enough mechanical drag to slow the motor's response, the ECM logs the slow response, accumulates the fault counter, and trips P2110 when the counter reaches threshold. A $100 throttle-body cleaning service is the fix in roughly 80% of cases. If cleaning doesn't resolve it, backprobe TPS-A and TPS-B and confirm mirror-image tracking, then inspect the motor connector for corrosion.
Vehicle-specific patterns2003-2007 Toyota Camry / Corolla / Highlander / Sienna 1MZ-FE / 2AZ-FE / 3MZ-FE is the absolute textbook P2110 platform — ETCS-i throttle bodies cake…
- 2003-2007Toyota Camry / Corolla / Highlander / Sienna 1MZ-FE / 2AZ-FE / 3MZ-FE is the absolute textbook P2110 platform — ETCS-i throttle bodies cake up with carbon by 70k miles and the code is so routine that Toyota dealers used to clean them as part of the 90k service. The fix is a 30-minute job: pull the air intake, remove four bolts, clean with throttle-body cleaner (NOT carb cleaner, which attacks the coating on the blade), reinstall, and run the relearn.
- 2004-2009Lexus RX330 / RX350 sees the same pattern.
- 2007-2012Nissan Altima / Murano VQ35 throws P2110 from the same carbon-buildup mechanism.
- 2008-2013Honda Pilot / Odyssey J35 sees P2110 when the throttle-body coolant lines clog and the blade housing warps from heat. Critical: every Toyota / Lexus ETCS-i platform requires the throttle relearn after cleaning — key-on / engine-off / pedal untouched / 30-second wait / key-off / 10-second wait / restart and let it idle for 3 minutes — skip it and the code resets within a day.
Look up another code
P2110 — frequently asked
What does a P2110 code mean?
ECM caps maximum blade opening due to TAC fault; engine runs but power is severely reduced.
What causes a P2110 code?
Common causes: Carbon-fouled throttle body (ETCS-i); Slow blade response; Clogged throttle-body coolant lines.
What are the symptoms of a P2110 code?
Typical symptoms: Top speed ~40-45 mph; Engine feels restricted; Check engine light; Reduced power light.
Is it safe to drive with a P2110 code?
Not for long. Driving on this one risks further damage. Get it to a shop rather than carrying on with it. Estimated repair: $100-$600.
How do I diagnose a P2110 code?
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. 1. Note every code that is set, not just this one. 2. Read the freeze frame — the conditions the fault was recorded under. 3. Confirm the fault is current rather than history. 4. Then work the likely-causes list in the order shown.
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