Throttle Actuator Control System -- Forced Limited Power
The P2106 code means the vehicle's onboard diagnostic system has detected: Throttle Actuator Control System -- Forced Limited Power. This is a critical severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $150 - $800 (parts and labor)
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Common Symptoms
- Significant loss of engine power
- Vehicle accelerates very slowly
- Reduced power or limp mode warning on dash
- Maximum speed limited to 15-30 mph
- Check engine light on
Probable Causes (Ranked by Likelihood)
- Electronic throttle body malfunction triggering limp mode Very High
- Accelerator pedal position sensor fault High
- Throttle position sensor disagreement High
- Wiring issue in throttle control system Moderate
- PCM detecting unsafe throttle operation Low
Step-by-Step Diagnostic Procedure
-
Scan for all related trouble codes -- P2106 is typically accompanied by other throttle system codes
-
Test accelerator pedal position sensors -- both signals should track smoothly from 0.5V to 4.5V
-
Test throttle position sensors on throttle body -- both signals should correlate with throttle opening
-
Inspect throttle body for carbon buildup causing slow response or sticking
-
Repair root cause codes, then clear all codes and perform throttle body relearn
Common Fixes by Vehicle
What techs usually find when diagnosing P2106 on specific vehicles — tap your vehicle for the fix and the exact part:
2004-2013 Nissan Altima/Maxima 2.5L/3.5L easy DIY
Nissan P2106 often = corroded connector at the electronic throttle body (ETB). Same fix as P0222/0223: unplug, clean, dielectric grease. If pins are green or loose, replace connector. Nissan sold a repair pigtail (24079-9B91B).
Labor: 30 min2002-2008 Nissan Altima/Maxima 3.5L VQ35DE easy DIY
Failed electronic throttle control module on Nissan. The ETB is replaced as a unit (Nissan 16119-ZE00A for VQ35). After install, drive 20-30 miles for idle learn. If P2106 returns, check ECM power/ground before condemning ETB.
Labor: 30-45 min2007-2015 Nissan Sentra/Versa 1.8L/2.0L easy DIY
Low battery voltage during cranking can false-trigger P2106. Load-test the battery -- if CCA is below 80% spec, replace. Corroded battery ground cable (Nissan 24080-8J000) is another top culprit; clean to bare metal and re-terminate.
Labor: 30 minFrequently Asked Questions
Can I drive with code P2106?
Only very short distances at low speed. The PCM has limited engine power to prevent a potentially dangerous throttle condition. The vehicle may only reach 15-30 mph. Drive only to the nearest safe location or repair shop.
What is the difference between P2104, P2105, and P2106?
P2104 forces the engine to idle only. P2105 forces a complete engine shutdown. P2106 allows limited power (partial throttle). All three are safety responses to throttle system faults, with P2106 being the least restrictive.
Will turning the car off and on fix reduced power?
Sometimes a restart temporarily clears the condition, but if the underlying fault remains, the reduced power mode will return quickly. This is not a reliable fix and the root cause needs to be repaired.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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