Error code P2108 on Nissan Almera G15 (2012-2019) is one of the most common problems associated with the throttle control system. Owners encounter it after 80–120 thousand kilometers, but cases are not uncommon on more “fresh” cars. The error indicates a malfunction in the damper drive circuit, which can lead to jerks during acceleration, a drop in power, or even the engine going into emergency mode.

Unlike other throttle related codes (eg. P2135 or P0120), P2108 points specifically to mechanical or electrical blocking of the damper drive, and not due to incorrect sensor readings. This means that the problem often lies in the physical wear of parts, and not in “glitches” of electronics. In this article we will look at how to accurately diagnose the cause, what spare parts may be needed for repair, and why ignoring the error can lead to failure of the entire throttle assembly.

What does error P2108 mean on Nissan Almera G15?

Code P2108 stands for «Throttle/Pedal Position Sensor/Switch ‘D’ Circuit Range/Performance Problem». In practice this means that the engine control unit (ECU) recorded a discrepancy between the expected and actual throttle position. B Almera G15 with engines HR16DE (1.6 l) and K4M (1.6 l, on early versions) uses an electronic throttle control system (ETCS), where the damper is driven by an electric motor rather than a cable.

Feature of the error P2108 is that it occurs when:

  • 🔧 Damper drive physically blocked (for example, due to carbon deposits or corrosion).
  • ⚡ Conductivity in the power circuit or signal wires of the drive motor is broken.
  • 🔄 ECU receives conflicting data from throttle position sensors (TPS).
  • 🛠️ Gears or bearings in the drive mechanism are worn out.

It is important to distinguish P2108 from similar errors:

  • P2101 — malfunction of the damper drive (common code).
  • P2135 — mismatch of sensor signals TPS.
  • P0120 — malfunction of the gas pedal position sensor circuit.
⚠️ Attention: If the error P2108 accompanied by a flashing lamp Check Engine and switching the engine to emergency mode (limiting revolutions to 2-3 thousand), operate the car it's impossible. This can lead to damage to the catalyst or overheating of the engine due to poor crankcase ventilation.

Causes of error P2108

On Nissan Almera G15 error P2108 in 70% of cases it is associated with mechanical wear of the throttle assembly. Here are the key reasons:

  1. Throttle valve contamination — carbon deposits and oil deposits on the damper walls and in the drive channels. This is especially true for cars with a mileage of >100 thousand km, where the crankcase ventilation system does not work effectively.
  2. Drive gear wear — plastic gears in the damper motor gearbox wear out over time, which leads to slipping and blocking.
  3. Corrosion or oxidation of contacts — moisture and salts penetrate into the connectors of the sensors and motor in winter, disrupting the signal.
  4. Drive motor malfunction — winding breakage or rotor jamming.
  5. Wiring problems - chafing or short circuit in the harness from ECU to the throttle.

Less common culprits include:

  • 🔋 Unstable voltage of the on-board network (for example, due to a discharged battery or faulty generator).
  • 🖥️ Firmware crash ECU (relevant after incorrect chip tuning).
  • 🚗 Mechanical damage to the throttle assembly after an accident or unqualified repair.
📊 How often do you clean the throttle body?
  • Never cleaned
  • Once every 50 thousand km
  • Once every 100 thousand km
  • Only when errors occur

Symptoms of error P2108 on Almera G15

Error P2108 rarely appears “on its own” - it is preceded by characteristic signs:

Symptom Description Danger level
Jerks during acceleration The car jerks at speeds of 1.5–2.5 thousand, especially when you gently press the gas. ⚠️ Average
RPM freezing The engine holds 1.5–2 thousand rpm after releasing the gas (for example, when braking). ⚠️⚠️ High
Emergency mode ECU limits power, lights up Check Engine, the engine does not spin above 3 thousand rpm. ⚠️⚠️⚠️ Critical
Gas failures When you press the pedal sharply, the speed “drops” for 1–2 seconds, then recovers. ⚠️ Average
Rough idle The speed fluctuates in the range of 600–1200 rpm, vibrations are possible. ⚠️ Low

If you ignore these symptoms, the problem will worsen over time: the wear of the drive gears will accelerate, and the damper may become completely stuck in the closed or open position. In the first case, the engine will stall and will not start, in the second, the speed will “go into the red zone”, which is fraught with damage CVT (on Almera G15 with variator).

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Before diagnosing the error P2108 Check the condition of the air filter. A clogged filter creates excess vacuum in the intake tract, which can simulate a throttle malfunction.

Diagnosing error P2108: step-by-step instructions

To pinpoint the cause P2108, you will need a scanner (for example, Launch X431 or ELM327) and a multimeter. Follow the algorithm:

Read errors with a scanner (including pending codes)|Check the visual condition of the throttle assembly|Test the drive motor resistance|Check the voltage at the sensor connector|Real-time data analysis (TPS parameters)-->

Step 1: Reading Errors

Connect the scanner and check:

  • 🔍 Availability of additional codes (for example, P0100 - malfunction MAF sensor, P0171 - lean mixture).
  • 📊 Options Throttle Position (should change smoothly from 0% to 100% when you press the gas).
  • 🔄 Condition ETCS Motor (if the scanner shows a break or short circuit, the motor needs to be replaced).

Step 2. Visual inspection of the throttle assembly

Remove the air duct and inspect the damper:

  • 🧹 Carbon deposits on the walls of the channel and the damper (cleaned with a carburetor product, for example, Abro CC-220).
  • 🔧 Backlash or jamming when manually moving the damper (with the ignition off).
  • 🔌 Oxidation of contacts on the connector (cleaned with contact lubricant CRC 2-26).

Step 3: Check the drive motor

Disconnect the throttle connector and measure the resistance between the motor contacts (usually 1–2 Ohm for windings). If the resistance tends to infinity, there is a break; if it is close to zero, there is a short circuit. Also check the voltage at the connector with the ignition on (there should be 5 V on the signal contacts of the sensors).

Step 4: Analyze Real-Time Data

Using a scanner, observe the following parameters:

  • TPS 1 And TPS 2 - must match (a difference of >10% indicates a malfunction of the sensors).
  • Throttle Actuator Control - if the value fluctuates or is fixed at the same level, the problem is in the drive.
⚠️ Attention: If after cleaning the throttle and resetting the error P2108 returns, do not rush to change the entire unit. In 30% of cases the fault becomes incorrect damper adaptation after cleaning. To reset the adaptation, a scanner with the function is required ETCS Reset (For example, Launch CReader).

How to resolve error P2108: repair or replace?

The repair method depends on the cause of the problem. Let's consider the options:

1. Cleaning the throttle body

If the error is caused by carbon deposits, cleaning is sufficient. Use:

  • 🧴 Carburetor cleaner (Abro CC-220, Liqui Moly Pro-Line).
  • 🧽 Soft brush (not metal!) and rags.
  • 🔧 Screwdriver for removing the damper (on Almera G15 4 bolt mounting T25).

Algorithm:

  1. Remove the air duct and disconnect the throttle connector.
  2. Apply the cleaner liberally to the valve and channels and leave for 5–10 minutes.
  3. Remove carbon deposits with a brush and wipe with a rag.
  4. Blow with compressed air (necessary to remove any remaining product).
  5. Reinstall the damper and perform adaptation using the scanner.

2. Replacing the drive motor or throttle assembly

If the damper motor is faulty (broken, jammed), it can be replaced separately (part number for Almera G15 — 22680-4M000 or 22680-4M00A). However, in 80% of cases it is more advisable to install the assembly assembly (article no. 22680-4M010), since wear of gears and bearings makes repairs a temporary solution.

Cost of a new throttle:

  • 🏷️ Original (Nissan) - 12–15 thousand rubles.
  • 🏷️ Analogue (Hitachi, Denso) - 6–9 thousand rubles.
  • 🏷️ Used (from disassembly) - 3-5 thousand rubles. (risk of repeated failure ~30%).

3. Repair of wiring or connectors

If the problem is broken wires or oxidation of contacts:

  • 🔧 Replace the damaged section of the harness (use wires with a cross section of at least 0.5 mm²).
  • 🔌 Treat the connector contacts DeoxIT or CRC Contact Cleaner.
  • 🛠️ If the connector is damaged, replace it entirely (part number 22770-4M000).
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After replacing the throttle body necessarily perform the damper adaptation procedure. Without her ECU does not recognize the new valve travel limits, and the error P2108 will remain.

Throttle valve adaptation after repair

On Nissan Almera G15 Damper adaptation is required after:

  • 🧹 Cleaning or replacing the throttle assembly.
  • 🔧 Disconnecting the connector ECU or removing the battery.
  • 🖥️ Control unit firmware updates.

To adapt, you need a scanner that supports the function ETCS Reset (For example, Launch X431 Pro or Bosch KTS). Procedure:

  1. Connect your scanner and select Special Functions → ETCS Reset.
  2. Follow the instructions on the screen (usually you need to press the gas pedal all the way down and release).
  3. After completing the procedure, turn off the engine, remove the key for 10 seconds, then start the car and check the idle speed (should be 650–750 rpm).

If you don’t have a scanner, you can try the “manual” method:

1. Выключите зажигание на 10 секунд.

2. Включите зажигание (не заводя двигатель), подождите 3 секунды.


3. Нажмите педаль газа до упора и отпустите (повторите 5 раз).


4. Выключите зажигание на 10 секунд, затем заведите двигатель.

This method does not work on all firmware versions ECU, but may help as a temporary solution.

Preventing error P2108 on Nissan Almera G15

To avoid reappearance P2108, follow the recommendations:

  • 🧴 Clean the throttle body every 50–60 thousand km (or more often if you drive a car in a city with frequent traffic jams).
  • 🔧 Check the condition of the air filter every 15 thousand km — a clogged filter accelerates the formation of carbon deposits.
  • ⚡ Monitor the voltage of the on-board network: low voltage (11.5 V) may damage the drive motor when starting.
  • 🛢️ Use high-quality fuel (octane number not lower than 95) - bad gasoline leads to increased carbon formation.
  • 🔌 Once a year, treat the throttle contacts and ECU protective lubricant (eg CRC 2-26).

Also avoid:

  • ❌ Sharp pressure on the gas when the engine is cold (accelerates drive wear).
  • ❌ Prolonged engine operation at idle speed (provokes carbon deposits).
  • ❌ Using aggressive cleaners (for example, acetone) - they damage the damper coating.
What will happen if P2108 is not repaired?

Ignoring the error P2108 leads to:

  1. Complete jamming of the throttle valve (the engine will not start or will operate at maximum speed).
  2. Overheating of the catalyst due to a disturbed mixture composition (the cost of replacing the catalyst is from 20 thousand rubles).
  3. CVT wear (CVT) due to jerking and unstable speed (variator repair costs 50–100 thousand rubles).
  4. Damage to spark plugs and coils due to detonation (symptom: engine tripping).

In critical cases replacement may be required ECU (price - from 30 thousand rubles).

Frequently asked questions about error P2108 on Almera G15

Is it possible to drive with error code P2108?

For a short time - yes, but only if the engine does not go into emergency mode. However, long driving P2108 will lead to accelerated wear CVT and a catalyst. It is recommended to resolve the problem within 1–2 weeks.

How much does it cost to repair a P2108 at a service center?

The cost depends on the reason:

  • Throttle cleaning - 1.5–3 thousand rubles.
  • Replacing the drive motor - 4–7 thousand rubles. (with work).
  • Replacement of the throttle assembly - 8-12 thousand rubles. (with adaptation).

At dealerships prices are 30–50% higher.

Is it possible to reset P2108 without a scanner?

Yes, but temporarily. Disconnect the battery terminal for 10-15 minutes - the error will reset, but without eliminating the cause it will return after 50-200 km. To achieve a complete reset, the damper must be adapted.

Which product is best for cleaning the throttle body? Almera G15?

Recommended cleaners:

  • Liqui Moly Pro-Line Drosselklappen-Reiniger (article 1900) — carefully removes carbon deposits without damaging the coating.
  • Abro CC-220 - a budget option, but requires careful washing.
  • Wynn’s Air Intake System Cleaner - Suitable for heavy soiling.

Do not use WD-40 or acetone - they leave an oil film that attracts dirt.

Why does error P2108 return after cleaning?

Reasons for relapse:

  • The damper did not adapt after cleaning.
  • The drive gears are worn (cleaning does not eliminate mechanical play).
  • There is a problem with the wiring or ECU, and not in the throttle itself.
  • A low-quality cleaner was used that left deposits.

In such cases, diagnostics of the drive motor or replacement of the assembly is required.