Fix P2110: Mechanic’s solutions that WORKED

The P2110: Throttle Actuator Control System – Forced Limited RPM code signifies that the throttle actuator control system has forcibly limited the engine’s RPM. This typically occurs when the system detects a malfunction in the throttle operation, prompting it to restrict engine speed to prevent damage or loss of control. The code can be triggered by various issues within the throttle system, including mechanical and electrical faults.

P2110 quick overview

Meaning	P2110: Throttle Actuator Control System – Forced Limited RPM
Is it serious?	This code is serious as it indicates a problem with the vehicle’s throttle system, which can lead to reduced engine power and possible stalling.
Possible causes	– Faulty or sticking throttle body – Electrical issues in the throttle actuator control system – Malfunctioning throttle position sensors – Poor electrical connections or damaged wiring – Problems with the vehicle’s Engine Control Module (ECM)
How to diagnose?	Inspect Throttle Body: Check the throttle body for any signs of sticking or damage. Check Electrical Connections: Ensure all electrical connections in the throttle system are secure and undamaged. Test Throttle Position Sensors: Verify the operation of the throttle position sensors. Examine Wiring: Inspect the wiring for any signs of damage or wear. Evaluate ECM: Consider the possibility of an ECM issue affecting throttle control.

How to fix P2110 – learn from mechanics

I looked into X service cases at iatn.com website where in the private forums the mechanics seek advice from other mechanics. I looked up a bunch of cases to help you decide how to fix your issue and see what would a real mechanic do to solve it.

Case #1: Jeep

Vehicle Information: 2012 Jeep Wrangler Unlimited Sport 3.6L

Issue + Repair History:

• Vehicle experienced hesitation and power loss at Wide Open Throttle (WOT) or on steep inclines.
• Displayed codes P2110 (ETC forced limit RPM) and P2173 (high airflow/vacuum leak).
• Replaced throttle body and performed relearn; issue persisted with code P2110 returning.
• Throttle Position Sensor (TPS) and Accelerator Pedal Position Sensor (APPS) readings were normal.
• Initially suspected clogged catalytic converter or fuel filter issue, but tests showed normal readings.

Other OBD2 Codes + Test Results:

• P2110 – Electronic Throttle Control Forced Limit RPM

Suggestions to Fix Issue:

• Test fuel pump for potential weakness.
• Check upstream O2 sensors’ behavior during WOT.
• Perform back pressure test on the catalytic converter.
• Check fuel pressure under heavy load.
• Follow test trees for returning codes after clearing and test drives.

Final Fix:

• Discovered the MAP sensor was reading about 2 inches lower than actual vacuum at high RPMs.
• Replaced MAP sensor with a known good unit, which resolved the issue.
• Updated PCM after replacing the sensor.

Case #2: Dodge

Vehicle Information: 2007 Dodge Caliber SXT 2.0L

Issue + Repair History:

• The electronic throttle control light intermittently flashes.
• Code P2110 stored (Throttle Actuator Control System – Forced Limited RPM).
• Issue occurs occasionally during normal driving and more frequently when adjusting the throttle in drive.

Computer Codes & Descriptions:

• P2110 – Throttle Actuator Control System – Forced Limited RPM

Suggestions to Fix Issue:

• Graph and compare the redundant position sensors for any discrepancies.
• Clean throttle bore and check for a throttle relearn procedure.
• Monitor the throttle pedal and throttle plate for glitches.
• Consider potential throttle opener sensor issues or a sticky throttle plate due to excessive blow-by.
• Check the throttle plate for dirt or obstruction and ensure it moves freely.
• Investigate wiring issues, including resistance and possible shorts.
• Verify if PCM and TCM are updated with the latest software.

Final Fix:

• Replaced the throttle body due to internal binding.
• After replacement, the issue was resolved, and the electronic throttle control light stopped flashing.

Case #3: Kia

Vehicle Information: 2007 Kia Optima LX 2.4L

Issue + Repair History:

• Vehicle entered limp mode, not exceeding 20 mph.
• Restarting the car temporarily resolved the issue.
• All voltages checked and within range.
• Road tested without duplicating the issue.

Computer Codes & Descriptions:

• P0698 – Reference voltage C low on APS1 (accelerator position sensor)
• P2110 – Limp Mode

Suggestions to Fix Issue:

• Advise to wait until the problem can be replicated with test equipment attached.
• Graph APS1 and APS2 sensor signal voltages during the occurrence.
• Check for any damage to the connector at the accelerator pedal.
• Review freeze frame data to understand conditions when the problem occurred.
• Consider scoping the APP sensor to catch potential faults.

Final Fix:

• Replaced the accelerator pedal as per customer’s choice.
• Vehicle left the shop, effectiveness of the fix to be determined over time.

Case #4: Lincoln

Vehicle Information: 2005 Lincoln LS Sport 3.9L

Issue + Repair History:

• Vehicle entered limp mode, unable to accelerate past 35 mph.
• Displayed codes P2107 (Throttle Actuator Control Module Processor) and P2110 (Throttle Actuator Control System Forced Limit).
• Replaced throttle body due to suspected shorting.
• Replaced PCM and reprogrammed to calibration #5w4a-12650-ee.
• Issue persisted even after replacements.

Computer Codes & Descriptions:

• P2107 – Throttle Actuator Control Module Processor
• P2110 – Throttle Actuator Control System Forced Limit

Suggestions to Fix Issue:

• Graph accelerator position sensors (APS 1 and 2) and check for mirroring voltages.
• Inspect connector at the pedal assembly for damage.
• Run pinpoint tests for the accelerator pedal sensor and PCM.
• Check Engine Coolant Temperature (ECT) and Electronic Throttle Control (ETC) systems.
• Replace spark plugs with Motorcraft only and all 8 ignition coils.

Final Fix:

• Replaced all ignition coils.
• The replacement resolved the issue, and the car ran smoothly post-repair.

Case #5: Chrysler

Vehicle Information: 2005 Chrysler 300 C 5.7L

Issue + Repair History:

• Intermittent throttle response drop and stalling.
• Red lightning bolts flashed on the dashboard during the issue.
• Replaced the throttle body injection (TBI) unit, which reduced the frequency of the problem.
• Pulled codes were P2101 and P2110.

Computer Codes & Descriptions:

• P2101 – TBI
• P2110 – TBI Max Limit Exceeded

Suggestions to Fix Issue:

• Check ground wires to TBI module.
• Verify the two Throttle Position Sensor (TPS) readings, which should add up to 5 volts.
• Check the Electronic Throttle Control (ETC) motor’s power and ground on pins 3 and 5.
• Inspect the TPS response to the PCM.
• If circuits are good and the issue persists, consider a faulty ETC.

Final Fix:

• Sent the vehicle to Chrysler for recalibration of the throttle body.
• Post recalibration, the vehicle functioned perfectly.

Advice	Brief Description of Diagnostic Step
Inspect Throttle Body	Check for sticking, damage, or dirt in the throttle body.
Test Throttle Position Sensors	Verify the operation and output of the throttle position sensors.
Check Electrical Connections	Ensure all connections related to the throttle system are secure and intact.
Evaluate Wiring and Connectors	Inspect wiring and connectors for damage, corrosion, or loose connections.
Consider ECM Issues	Assess the Engine Control Module for potential faults or need for recalibration.
Replace Throttle Body if Necessary	Consider replacing the throttle body if it is faulty or malfunctioning.