Code
P2112
Generic
P — Powertrain
Throttle Actuator A Control System - Stuck Closed
Views:
UK: 29
EN: 87
RU: 79
AI status
Completed
Completed
100%
Causes
- Mechanical binding or carbon build-up in the throttle plate or bore
- Failed throttle actuator motor inside the electronic throttle body
- Wiring harness damage, open/short or poor connector related to throttle motor or position sensors
- Faulty throttle position sensor(s) (TPS) or sensor circuit fault
- Blown fuse, bad power supply or poor ground to throttle body
- ECM/software fault or internal driver failure
Symptoms
- Check Engine Light (MIL) illuminated
- Reduced engine power / limp mode, limited throttle response
- Engine idle problems (high or low idle) or stall
- No or delayed throttle response when pressing accelerator
- Possible stored multiple throttle-related trouble codes
What to check
- Read freeze frame and complete trouble code list with a capable scan tool
- Visual inspection of wiring and connectors at the throttle body for corrosion, pin damage, or loose pins
- Inspect throttle body for carbon build-up or mechanical obstruction
- With key on engine off (KOEO), check throttle plate movement when commanded by scan tool
- Measure supply voltage and ground at the throttle body connector
- Compare throttle commanded position vs. actual position through scan tool data
Signal parameters
- Throttle commanded position (ECU command) — typically in % or degrees
- Throttle actual/feedback position (TPS) — typically in % or degrees
- TPS sensor voltages — nominally ~0.5V (closed) to ~4.5V (open) per sensor
- Actuator supply voltage — battery/ignition 12V present at power pin
- Actuator control signal — PWM duty cycle or H-bridge outputs from ECU (varies by manufacturer)
- Motor coil resistance — expected manufacturer-specific ohm range (check service data)
Diagnostic algorithm
- Retrieve all stored DTCs and freeze frame data. Note any additional throttle/pedal codes.
- Perform a visual inspection: check throttle body connector for corrosion, bent pins, water ingress, or damaged wiring along the harness to the ECU.
- With the engine OFF and key ON, use a scan tool to command the throttle open/close. Observe whether the throttle plate moves and whether actual position follows commanded position. If plate does not move, suspect mechanical or actuator failure.
- Inspect and clean the throttle body if heavy carbon or debris is present. Re-test after cleaning — do not force the plate by hand when connected to the actuator.
- Measure supply voltage and ground at the throttle body with key ON. Verify proper battery voltage to the power pin and good ground continuity to chassis/ECU ground.
- Backprobe actuator and TPS signals while commanding the throttle: verify motor control signals change (PWM/direction) and that TPS feedback voltage changes correspondingly. If command changes but no motor movement and correct power/ground present, suspect internal actuator failure.
- Check TPS sensor voltages and correlation between TPS1 and TPS2 (if two sensors): they should move together and be within expected voltage ranges. Large discrepancies indicate sensor or wiring faults.
- Inspect wiring harness for opens, shorts to battery or ground, or intermittent wiring faults (wiggle test while monitoring signals). Repair any damaged wiring or connectors.
- If wiring and connectors are good but actuator does not respond, check actuator coil resistance against manufacturer specification. If out of spec, replace throttle body assembly.
- If actuator motor and TPS check good on the bench but system still faults, consider ECU output driver failure — test ECU outputs per service manual or consult manufacturer technical service. Replace ECU only after confirming external components and wiring are good.
- After repairs or replacement (throttle body or wiring), perform required throttle adaptation / relearn procedure with a scan tool, clear codes, and perform a road test to confirm the fault does not return.
Likely causes
- Carbon deposits preventing throttle plate movement
- Throttle actuator motor winding or gearbox failure
- Corroded/loose connector at the throttle body
- Shorted or open motor control wires (PWM/ground/power)
- Incorrect TPS feedback (voltage out of expected range or wrong correlation between sensors)
- Faulty ECM driver stage controlling the throttle motor
Fault status
Status
MIL on. Throttle actuator control system reports 'stuck closed' — vehicle may enter limp/limited power mode and exhibit restricted throttle response.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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Code
P2112
LAND ROVER
P — Powertrain
Throttle actuator control system - stuck
Views:
UK: 20
EN: 75
RU: 40
AI status
Completed
Completed
100%
Causes
- Mechanical binding or carbon build-up in the throttle plate or bore
- Failed throttle actuator motor inside the electronic throttle body
- Wiring harness damage, open/short or poor connector related to throttle motor or position sensors
- Faulty throttle position sensor(s) (TPS) or sensor circuit fault
- Blown fuse, bad power supply or poor ground to throttle body
- ECM/software fault or internal driver failure
Symptoms
- Check Engine Light (MIL) illuminated
- Reduced engine power / limp mode, limited throttle response
- Engine idle problems (high or low idle) or stall
- No or delayed throttle response when pressing accelerator
- Possible stored multiple throttle-related trouble codes
What to check
- Read freeze frame and complete trouble code list with a capable scan tool
- Visual inspection of wiring and connectors at the throttle body for corrosion, pin damage, or loose pins
- Inspect throttle body for carbon build-up or mechanical obstruction
- With key on engine off (KOEO), check throttle plate movement when commanded by scan tool
- Measure supply voltage and ground at the throttle body connector
- Compare throttle commanded position vs. actual position through scan tool data
Signal parameters
- Throttle commanded position (ECU command) — typically in % or degrees
- Throttle actual/feedback position (TPS) — typically in % or degrees
- TPS sensor voltages — nominally ~0.5V (closed) to ~4.5V (open) per sensor
- Actuator supply voltage — battery/ignition 12V present at power pin
- Actuator control signal — PWM duty cycle or H-bridge outputs from ECU (varies by manufacturer)
- Motor coil resistance — expected manufacturer-specific ohm range (check service data)
Diagnostic algorithm
- Retrieve all stored DTCs and freeze frame data. Note any additional throttle/pedal codes.
- Perform a visual inspection: check throttle body connector for corrosion, bent pins, water ingress, or damaged wiring along the harness to the ECU.
- With the engine OFF and key ON, use a scan tool to command the throttle open/close. Observe whether the throttle plate moves and whether actual position follows commanded position. If plate does not move, suspect mechanical or actuator failure.
- Inspect and clean the throttle body if heavy carbon or debris is present. Re-test after cleaning — do not force the plate by hand when connected to the actuator.
- Measure supply voltage and ground at the throttle body with key ON. Verify proper battery voltage to the power pin and good ground continuity to chassis/ECU ground.
- Backprobe actuator and TPS signals while commanding the throttle: verify motor control signals change (PWM/direction) and that TPS feedback voltage changes correspondingly. If command changes but no motor movement and correct power/ground present, suspect internal actuator failure.
- Check TPS sensor voltages and correlation between TPS1 and TPS2 (if two sensors): they should move together and be within expected voltage ranges. Large discrepancies indicate sensor or wiring faults.
- Inspect wiring harness for opens, shorts to battery or ground, or intermittent wiring faults (wiggle test while monitoring signals). Repair any damaged wiring or connectors.
- If wiring and connectors are good but actuator does not respond, check actuator coil resistance against manufacturer specification. If out of spec, replace throttle body assembly.
- If actuator motor and TPS check good on the bench but system still faults, consider ECU output driver failure — test ECU outputs per service manual or consult manufacturer technical service. Replace ECU only after confirming external components and wiring are good.
- After repairs or replacement (throttle body or wiring), perform required throttle adaptation / relearn procedure with a scan tool, clear codes, and perform a road test to confirm the fault does not return.
Likely causes
- Carbon deposits preventing throttle plate movement
- Throttle actuator motor winding or gearbox failure
- Corroded/loose connector at the throttle body
- Shorted or open motor control wires (PWM/ground/power)
- Incorrect TPS feedback (voltage out of expected range or wrong correlation between sensors)
- Faulty ECM driver stage controlling the throttle motor
Fault status
Status
MIL on. Throttle actuator control system reports 'stuck closed' — vehicle may enter limp/limited power mode and exhibit restricted throttle response.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email