Error code P2138 on Nissan Qashqai (especially relevant for models J10 And J11 with gasoline engines HR16DE, MR20DE) is one of the most common problems that owners face. It signals a malfunction in the accelerator pedal or throttle valve circuit, but in practice the reasons can be much more varied. Unlike other errors, P2138 often appears sporadically, which complicates diagnosis - the car may become “stupid” when accelerating, twitch or go into emergency mode for no apparent reason.

In this article we will analyze not only standard reasons (such as broken wiring or dirty throttle), but also “hidden” factors - from ECU firmware to mechanical problems with the throttle cable. You will learn how to correctly read an error, what tools you will need for repairs, and when you should go to a service station and when you can handle it yourself. We will pay special attention to the nuances of diagnostics for Qashqai with a variator - there is an error P2138 often disguised as transmission problems.

What does error P2138 mean on Nissan Qashqai

Code P2138 stands for «Throttle/Pedal Position Sensor/Switch "D" Circuit Low Input» - low signal from the throttle position sensor or gas pedal in circuit “D”. In practice this means that Engine ECU receives incorrect data about the throttle or pedal position, which leads to:

  • 🚗 Dips during acceleration — the car “does not pull” or jerks.
  • ⚠️ Emergency mode - lights up «Check Engine», power is limited.
  • 🔧 Unstable speed at idle speed (floating or high).
  • 💨 Increased fuel consumption — The ECU “thinks” that the damper is open more than it actually is.

On Nissan Qashqai error P2138 often accompanied by other codes, for example:

  • P0120 — Malfunction of the throttle position sensor circuit.
  • P2101 - Throttle valve drive error.
  • P0507 - high idle speed.

It is important to understand that P2138 - this is not a sentence, but an indication of a problem in the engine management system. In 60% of cases, it is not the sensor itself that is to blame, but wiring, connectors or mechanical interference. For example, on Qashqai J10 a common cause is oxidation of the contacts in the gas pedal connector, and on J11 — contamination of the throttle assembly due to the characteristics of the crankcase ventilation system.

📊 What error have you encountered on Nissan Qashqai?
  • P2138
  • P0300 (misfire)
  • P0171 (lean mixture)
  • P0420 (catalyst)
  • Other

The main causes of error P2138

Reasons for appearance P2138 can be divided into 3 groups: electric, mechanical And software. Below is a complete list with clarifications for Nissan Qashqai.

Fault type Specific reason Frequency on Qashqai
Electrical Oxidation of contacts in the gas pedal connector Very common (40% of cases)
Broken or shorted wiring from the sensor to the ECU Often (25%)
Throttle Position Sensor (TPS) malfunction Rarely (10%)
Mechanical Throttle assembly contamination (carbon deposits, oil) Very often (35%)
Worn or stuck throttle cable (on models up to 2013) Rarely (5%)
Software ECU firmware failure (especially after chip tuning) Rarely (10%)

On Nissan Qashqai J11 (2014–2021) most often to blame gas pedal sensor — its contacts oxidize due to moisture entering through the seals. On J10 (2007–2013) the leading cause is throttle contamination, especially if the car was operated in a city with frequent traffic jams. In both cases, the error may appear periodically, for example, at high humidity or after washing the engine.

⚠️ Attention: If the error P2138 appears along with P0606 (ECU error), do not try to reset it with a scanner - this may indicate damage to the firmware. In this case, the unit must be re-flashed or replaced.

How to diagnose error P2138 yourself

For diagnostics P2138 on Nissan Qashqai you will need:

  • 🔧 Diagnostic scanner (For example, ELM327 or Launch CReader).
  • 🔍 Multimeter to check the voltage.
  • 🛠️ Screwdriver and contact cleaner (type CRC).
  • 📱 Smartphone with the program (Torque Pro, Nissan DataScan).

Step 1: Read errors with scanner. If in addition P2138 there are other codes (for example, P0122 - low TPS sensor voltage), start with them. If there is only one error, proceed to checking the sensors.

Step 2: Check the gas pedal sensor:

  1. Disconnect the connector from the pedal (located under the steering wheel by removing the plastic cover).
  2. Measure the resistance between contacts 1–2 and 2–3 with the pedal pressed/released. Norm: 0.5–4.5 kOhm.
  3. Check the voltage at the connector with the ignition on: between pin 3 and the mass should be 5 V.

Step 3: Inspect the throttle assembly. On Qashqai it is located to the right of the engine (when viewed in the direction of travel). Remove the air duct pipe and check:

  • 🔹 Cleanliness of the damper (carbon deposits or oil indicate a problem with crankcase ventilation).
  • 🔹 Mobility of the damper - it should open smoothly, without jamming.
  • 🔹 Integrity of the TPS sensor wiring (often rubs against the intake manifold).

Read all errors with a scanner|Talk the gas pedal sensor with a multimeter|Check the voltage at the TPS connector|Inspect the throttle assembly for dirt|Test the throttle cable (if any)

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If all parameters are normal, but the error remains, the problem may be ECU or firmware. In this case, only diagnostics at a service station with access to Nissan Consult.

How to Fix Error P2138: Step-by-Step Instructions

The method of repair depends on the cause. Below are instructions for the most common cases on Nissan Qashqai.

1. Cleaning the throttle body

You will need: throttle cleaner (Liqui Moly Pro-Line), rags, screwdriver.

  1. Remove the air duct pipe from the throttle body.
  2. Disconnect the TPS sensor connector (carefully, do not damage the latch!).
  3. Spray the cleaner onto the valve and channels, remove carbon deposits with a rag.
  4. Check the movement of the damper - it should open without effort.
  5. Reassemble everything in reverse order and reset the error using the scanner.
⚠️ Attention: On Qashqai J11 after cleaning the throttle body it may be necessary damper adaptation through a diagnostic scanner. Without this, the idle speed may fluctuate.

2. Repair of the gas pedal connector

If the contacts are oxidized:

  1. Remove the plastic trim under the steering wheel (unscrew the 2 bolts T20).
  2. Disconnect the connector from the pedal and inspect the contacts.
  3. Clean them up CRC Contact Cleaner or alcohol.
  4. Apply to contacts dielectric grease (For example, Molykote).

3. Replacing the TPS sensor

If the sensor is faulty (checked with a multimeter), it must be replaced. On Qashqai the original sensor has an article number 22680-4M000 (for HR16DE) or 22680-AL500 (for MR20DE). After replacement:

  • Clear errors with a scanner.
  • Carry out throttle adaptation (if required).
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If after replacing the TPS the error remains, check engine weight — the contact on the body under the battery often oxidizes.

4. Wiring check

Broken or shorted wires are a common cause P2138 on Qashqai. Inspect the harness from the gas pedal to the ECU (located under the hood, next to the battery). Please note:

  • 🔹 Frayed wires near the intake manifold.
  • 🔹 Oxidized contacts in connectors (especially after washing the engine).
  • 🔹 Damage to insulation from vibration.

Features of error P2138 on Qashqai with CVT

On Nissan Qashqai with variator JF011E/JF016E error P2138 often disguised as transmission problems. The fact is that the engine ECU and the CVT ECU exchange data about the load, and if the signal from the gas pedal is incorrect, the CVT can:

  • 🚘 Stuck at high speeds without acceleration.
  • ⚡ Jerky when shifting (although the variator does not have them, it imitates them).
  • 🛑 Go into emergency mode with flashing lamp «AT».

If together with P2138 variator errors appeared (P0700, P0740), start with diagnostics gas and throttle pedals - in 80% of cases the problem lies with them. The variator is “not to blame” here, but it reacts to incorrect data from the engine.

What should I do if P2138 only appears when the engine is cold?

This is a typical symptom air leak through a cracked hose or throttle seal. Check:

  • 🔹 The pipe from the air intake to the throttle (often cracks in the cold).
  • 🔹 O-ring of the throttle assembly.
  • 🔹 Crankcase ventilation valve (may freeze in winter).

When to go to a service station: difficult cases

Not all problems with P2138 you can decide on your own. Contact a specialist if:

  • 🔧 The error appears after replacing sensors or cleaning the throttle.
  • 💻 Together with P2138 there are ECU errors (P0600–P0606).
  • 🔌 The problem disappears after resetting, but returns after 10–20 km.
  • 🚗 The car stalls while driving or does not start.

At the service station for Nissan Qashqai with an error P2138 usually carried out:

  1. Complete ECU diagnostics with firmware check.
  2. Continuity testing of all circuits from the gas pedal to the throttle.
  3. Throttle valve adaptation through Nissan Consult.
  4. Checking the variator (if there are related errors).

The cost of diagnostics is from 1,500 to 3,000 rubles. Repairs (replacement of sensors, cleaning of the throttle, firmware) will cost 3,000–10,000 rubles, depending on the reason.

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If error P2138 appears after chip tuning, return the stock firmware - 90% of “tuning” firmware do not work correctly with the gas pedal sensors on Qashqai.

Prevention of error P2138 on Nissan Qashqai

To avoid reappearance P2138, follow the recommendations:

  • 🔧 Clean the throttle body every 30,000–50,000 km (or more often if you drive in traffic jams).
  • 🚿 Avoid engine washing under high pressure - water enters the sensor connectors.
  • 🔌 Check your contacts gas pedal and TPS at each maintenance.
  • ⛽ Use quality fuel — bad gasoline accelerates the formation of carbon deposits on the throttle body.
  • 📱 Watch out for bugs through a scanner - early diagnosis prevents serious damage.

On Qashqai J11 (2014+) pay special attention crankcase ventilation system — its clogging leads to oil getting into the throttle and rapid contamination. Solution: Flush the PCV valve every 20,000 km or install an oil trap.

FAQ: Frequently asked questions about error P2138

Is it possible to drive with error code P2138?

Short term - yes, but not recommended. In emergency mode, the car loses power, fuel consumption increases, and long driving can lead to breakdown of the variator (if there is one) or overheating of the engine due to incorrect throttle operation.

Why does P2138 only appear during overclocking?

This indicates unstable contact in the gas pedal or TPS sensor circuit. When you press the gas, vibration or stress breaks the connection. Check connectors and wiring for microcracks.

How to reset error P2138 without a scanner?

You can remove the battery terminal for 10-15 minutes, but this will not eliminate the cause. The error will return on the next failure. For a complete reset you need a scanner (for example, ELM327 with the program Torque Pro).

How much does it cost to replace a gas pedal sensor on a Qashqai?

The original sensor is worth 4,000–6,000 rubles, analog (Valeo, Bosch) — 2,500–3,500 rubles. Replacement will cost 1,000–1,500 rubles at the service station (or for free if you do it yourself).

Could P2138 be due to bad gasoline?

No, directly - no. But bad fuel leads to throttle contamination and sensors, which can indirectly provoke P2138. If the error appears after refueling, check the throttle assembly.