Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
DTC P2118: Throttle Actuator Current Range/Performance Problem
- Turn the ignition switch to ON (II).
- Clear the DTC with the HDS.
- Slowly press the accelerator pedal to the floor.
- Check for Pending or Confirmed DTCs with the HDS.
Is DTC P2118 indicated?
YES -Go to step 5.
NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the throttle body and the PCM.
- Turn the ignition switch to LOCK (0).
- Jump the SCS line with the HDS.
- Disconnect the throttle body 6P connector.
- Disconnect PCM connector C (49P).
- Check for continuity between PCM connector terminal C43 and throttle body 6P connector terminal No. 4.Fig 1: Checking Continuity Between PCM Connector Terminal C43 And Throttle Body 6P Connector Terminal No. 4
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES -Go to step 10.
NO -Repair an open in the wire between the throttle body and the PCM (C43), then go to step 14.
- Check for continuity between throttle body 6P connector terminals No. 5 and No. 6.
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES -Repair a short in the wires between throttle body 6P connector terminal No. 5 (ETCS- line) and No. 6 (ETCS+ line), then go to step 14.
NO -Go to step 11.
- Check for continuity between body ground and throttle body 6P connector terminals No. 5 and No. 6 individually.Fig 3: Checking Continuity Between Body Ground And Throttle Body 6P Connector Terminals No. 5 And No. 6
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES -Repair a short in the wire between the throttle body 6P connector and body ground, then go to step 14.
NO -Go to step 12.
- At the throttle body side, measure the resistance between throttle body 6P connector terminals No. 5 and No. 6 with the throttle fully closed.
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there about 1.0 Ω or less?
YES -Go to step 13.
NO -Go to step 22.
- Replace the throttle body (see THROTTLE BODY REMOVAL/INSTALLATION ).
- Reconnect all connectors.
- Turn the ignition switch to ON (II).
- Reset the PCM with the HDS.
- Do the PCM idle learn procedure (see PCM IDLE LEARN PROCEDURE ).
- Turn the ignition switch to LOCK (0).
- Turn the ignition switch to ON (II).
- Slowly press the accelerator pedal to the floor.
- Check for Pending or Confirmed DTCs with the HDS.
Is DTC P2118 indicated?
YES -Check for poor connections or loose terminals at the throttle body and the PCM, then go to step 1.
NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.
- Reconnect ail connectors.
- Update the PCM if it does not have the latest software (see PCM UPDATE ), or substitute a known-good PCM (see SUBSTITUTING THE PCM ).
- Turn the ignition switch to LOCK (0).
- Turn the ignition switch to ON (II).
- Slowly press the accelerator pedal to the floor.
- Check for Pending or Confirmed DTCs with the HDS.
Is DTC P2118 indicated?
YES -Check for poor connections or loose terminals at the throttle body and the PCM. If the PCM was updated, substitute a known-good PCM (see SUBSTITUTING THE PCM ), then go to step 27. If the PCM was substituted, go to step 1.
NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see PCM REPLACEMENT ). If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.