P1226 CHEVROLET – Injector 2 Control Circuit

P1226 CHEVROLET Possible Causes

  • Faulty fuel injector 2
  • Fuel injector 2 harness is open or shorted
  • Poor electrical connection in fuel injector 2 circuit
  • Faulty Fuel Injection Control Module (FICM)
  • Faulty Engine Control Module (ECM)

How to Fix Code P1226 CHEVROLET?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Technical Notes

If only one fuel injector control circuit Diagnostic Trouble Code (DTC) is set, an open circuit or poor connection is the most likely cause. If groups of 4 fuel injector control circuit DTCs are set, suspect a short to ground. Cylinder groups are 2, 3, 5, 8 or 1, 4, 6, 7. More than 4 fuel injector control circuit DTCs indicate a short to voltage on the fuel injector control circuit is the most likely cause.

Possible Symptoms

  • Engine Light On (or Service Engine Soon Warning Light)
  • Engine misfire
  • Rough running

P1226 CHEVROLET Meaning

The Engine Control Module (ECM) activates the appropriate fuel injector on the compression stroke for each cylinder. The ECM controls the Fuel Injection Control Module (FICM) by grounding the control circuit through a semiconductor device called a driver. The ECM monitors the driver status. If the ECM detects an incorrect voltage for the commanded state of a fuel injector driver, Diagnostic Trouble Code (DTC) P1223, P1226, P1229, P1232, P1235, P1238, P1241 or P1244 will be set.

P1226 GMC – Injector 2 Output Circuit

P1226 GMC Possible Causes

  • Faulty fuel injector 2
  • Fuel injector 2 harness is open or shorted
  • Poor electrical connection in fuel injector 2 circuit
  • Faulty Fuel Injection Control Module (FICM)
  • Faulty Engine Control Module (ECM)

How to Fix P1226 GMC Code?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Technical Notes

If only one fuel injector control circuit Diagnostic Trouble Code (DTC) is set, an open circuit or poor connection is the most likely cause. If groups of 4 fuel injector control circuit DTCs are set, suspect a short to ground. Cylinder groups are 2, 3, 5, 8 or 1, 4, 6, 7. More than 4 fuel injector control circuit DTCs indicate a short to voltage on the fuel injector control circuit is the most likely cause.

Possible Symptoms

  • Engine Light On (or Service Engine Soon Warning Light)
  • Engine Misfire
  • Rough Running

P1226 GMC Meaning

The Engine Control Module (ECM) activates the appropriate fuel injector on the compression stroke for each cylinder. The ECM controls the Fuel Injection Control Module (FICM) by grounding the control circuit through a semiconductor device called a driver. The ECM monitors the driver’s status. If the ECM detects an incorrect voltage for the commanded state of a fuel injector driver, Diagnostic Trouble Code (DTC) P1223, P1226, P1229, P1232, P1235, P1238, P1241 or P1244 will be set.

P1226 INFINITI – Closed Throttle Position Learning Performance Problem

P1226 INFINITI Possible Causes

  • Faulty electronic throttle control actuator (TP sensor 2)
  • Electronic throttle control actuator (TP sensor 2) harness is open or shorted
  • Poor electrical connection in electronic throttle control actuator (TP sensor 2) circuit

How to Fix P1226 INFINITI Code?

Start by checking the “possible causes” listed above. Visually inspect the corresponding cable harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

When is the Code Detected?

Closed throttle position learning is not completed successfully, repeatedly.

Possible Symptoms

  • Engine light on (or service engine soon warning light)

P1226 INFINITI Meaning

The electronic throttle control actuator consists of a throttle control motor, throttle position sensor, etc. The throttle position (TP) sensor responds to throttle valve movement.
The throttle position sensor has two sensors. These sensors are a type of potentiometer that convert the throttle valve position into output voltage and transmit the voltage signal to the engine control module (ECM). Additionally, these sensors detect the opening and closing speed of the throttle valve and transmit voltage signals to the ECM. The ECM determines the current throttle valve opening angle from these signals and the ECM controls the throttle control motor to properly adjust the throttle valve opening angle in response to driving conditions.

P1226 NISSAN – Closed Throttle Position Learning Performance Problem

Complete Guide: Nissan Code P1226 (Throttle Actuator Control Issue)

The error code P1226 on Nissan vehicles indicates a malfunction related to the electronic throttle control actuator (TP2 sensor). This system controls the throttle position and communicates with the engine control module (ECM). Here are the causes, symptoms, and solutions to resolve this issue.

Table of Contents

  1. Meaning of Code P1226
  2. Possible Causes
  3. Common Symptoms
  4. Diagnostic Procedure
  5. Repair Solutions
  6. Prevention

1. Meaning of Code P1226

Code P1226 indicates a problem with the throttle position sensor (TP2) or its circuit. This sensor, integrated into the throttle control actuator, sends throttle position and opening speed signals to the ECM. If the ECM detects an inconsistency (e.g., missing signal, abnormal voltage), the code is triggered and the engine light illuminates.

2. Possible Causes

  • Faulty throttle control actuator: Wear or failure of the TP2 sensor.
  • Electrical issue:
  • Damaged TP2 sensor wiring (cut wires, short circuits).
  • Oxidized, loose, or corroded connectors.
  • Unperformed learning: The throttle position calibration procedure (at idle) has failed multiple times.
  • ECM failure (rare): Software or hardware problem with the control module.

3. Common Symptoms

  • 🔴 Illuminated engine light (or warning message).
  • 🚗 Throttle response issues:
  • Unstable idle.
  • Lack of power or jerky acceleration.
  • Limp mode activated (speed limitation).
  • ⚡ Cruise control deactivation.

4. Diagnostic Procedure

Step 1: Visual Inspection

  • Check the TP2 sensor wiring and connectors:
  • Look for cut, chafed, or burnt wires.
  • Inspect connector pins (bent, oxidized, broken).
  • Clean connectors with electrical contact cleaner if necessary.

Step 2: Electrical Measurements

  • Using a multimeter:
  • Test the TP2 sensor resistance (expected values: model-specific – consult a technical manual).
  • Check the power supply voltage (5V) and circuit ground.

Step 3: ECM Diagnosis

  • Use an OBD2 scanner to:
  • Read related error codes (e.g., P0122, P0123).
  • Check real-time data (TP2 signal vs. TP1).
  • Perform a throttle relearn (if allowed by the ECM).

5. Repair Solutions

Solution 1: Repair Electrical Circuit

  • Repair or replace damaged wiring.
  • Tighten or replace faulty connectors.

Solution 2: Replace TP2 Sensor or Actuator

  • If the TP2 sensor is faulty, replace the throttle control actuator (often sold as a complete unit).

Solution 3: Reset ECM

  • After repair:
  • Clear error codes with an OBD2 scanner.
  • Perform the throttle learning procedure (follow Nissan manual instructions).

Solution 4: Software Update

  • If the problem persists, an ECM update at a Nissan dealership may be necessary.

6. Prevention

  • Avoid aggressive cleaning of the throttle body (risk of damaging sensors).
  • Regularly check connectors (moisture, corrosion).
  • Use a well-maintained battery to prevent electrical fluctuations.

When to Consult a Professional?

If the diagnostic steps exceed your skills, or if the ECM requires reprogramming, visit a qualified mechanic or Nissan dealership. Improper handling of the actuator can lead to critical malfunctions (e.g., loss of acceleration control).

Estimated Cost:

  • Actuator replacement: €200 to €600 (part + labor).
  • Wiring repair: €50 to €150.

P1226 VOLKSWAGEN – Cylinder 2 Injector Circuit Short to Ground

P1226 VOLKSWAGEN Possible Causes

  • Faulty fuel injector 2
  • Fuel injector 2 harness is open or shorted
  • Poor electrical connection in fuel injector 2 circuit

How to Fix P1226 VOLKSWAGEN Code?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Technical Notes

If the code is combined with other fuel injector codes (P1225, P1227, P1228, P1229, P1230), the problem may be the fuel pump relay.

Possible Symptoms

  • Engine light on (or service engine soon warning light)

P1226 VOLKSWAGEN Meaning

Cylinder 2 injector circuit short to ground is the generic description for Volkswagen P1226 code, but the manufacturer may have a different description for your vehicle model and year. Currently, we don’t have more information about Volkswagen P1226 OBDII code.

P1227 – Fuel Injector 2 Control Circuit Shorted

Possible Causes

The P1227 code may be triggered for the following reasons:

  • Faulty fuel injector 2.
  • Open or shorted fuel injector 2 wiring harness.
  • Poor electrical connection in the fuel injector 2 circuit.
  • Faulty Engine Control Module (ECM).

How to Fix Code P1227?

  1. Visual Inspection:
    • Inspect the wiring harness of injector 2 for damage, exposed wires, or corroded connectors.
    • Look for broken, bent, or misaligned pins in the connectors.
  2. Test Fuel Injector 2:
    • Use a multimeter to check the injector’s resistance. Compare the results to the manufacturer’s specifications.
    • If the injector is faulty, replace it.
  3. Circuit Check:
    • Test the power circuit to ensure it provides the correct voltage.
    • Check the control circuit for possible short circuits or breaks.
  4. Inspect the ECM:
    • If all previous tests are conclusive and the problem persists, test the ECM module to verify if it is handling control signals correctly. Replace it if necessary.

Possible Symptoms

  • Check engine light on.
  • Engine running rough or loss of power.
  • Increased fuel consumption.

Meaning of Code P1227

The Engine Control Module (ECM) controls the fuel injectors by supplying voltage through the control circuits. When an anomaly is detected in an injector’s circuit (such as incorrect current or a short circuit), the ECM disables the affected injector. In this case, injector 2 is targeted, and the ECM may also disable a group of injectors if necessary to protect the engine.

If the repairs seem complex or the problem persists, it is advisable to consult a qualified mechanic. Need a more detailed guide?

P1227 2003 INFINITI G35 – Low Input of Accelerator Pedal Position Sensor 2 Circuit

P1227 2003 INFINITI G35 Possible Causes

  • Faulty Accelerator Pedal Position (APP) Sensor
  • Accelerator Pedal Position (APP) Sensor Harness is Open or Shorted
  • Poor Electrical Connection in Accelerator Pedal Position (APP) Sensor Circuit

How to Fix Code P1227 2003 INFINITI G35?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

When is the Code Detected?

An excessively low voltage from the Accelerator Pedal Position (APP) Sensor 2 is sent to the Engine Control Module (ECM).

Possible Symptoms

  • Engine Light On (or Service Engine Soon Warning Light)

P1227 2003 INFINITI G35 Meaning

The Accelerator Pedal Position (APP) Sensor is installed on the upper end of the accelerator pedal assembly. The sensor detects the throttle position and sends a signal to the Engine Control Module (ECM).
The Accelerator Pedal Position Sensor has two sensors. These sensors are a type of potentiometer that convert the accelerator pedal position into an output voltage and send the voltage signal to the ECM.
Additionally, these sensors detect the opening and closing speed of the accelerator pedal and transmit the voltage signals to the ECM. The ECM evaluates the current opening angle of the accelerator pedal from these signals and controls the throttle control motor based on these signals.
The idle position of the accelerator pedal is determined by the ECM receiving the signal from the accelerator pedal position sensor. The ECM uses this signal for engine operation, such as fuel cut-off.

P1227 AUDI – Cylinder 3 Injector Circuit Short to Ground

P1227 AUDI Possible Causes

  • Faulty fuel injector 3
  • Fuel injector 3 harness is open or shorted
  • Poor electrical connection in fuel injector 3 circuit

How to fix P1227 AUDI code?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Technical Notes

If the code is combined with other fuel injector codes (P1225, P1226, P1228, P1229, P1230), the problem may be the fuel pump relay.

Possible Symptoms

  • Engine light on (or service engine soon warning light)

P1227 AUDI Meaning

Cylinder 3 injector circuit shorted to ground is the generic description for Audi P1227 code, but the manufacturer may have a different description for your vehicle model and year. Currently, we don’t have more information about the Audi P1227 OBDII code.

P1227 BUICK – Fuel Injector Control Circuit 2 Shorted

P1227 BUICK Possible Causes

  • Faulty fuel injector 2
  • Fuel injector 2 harness is open or shorted
  • Poor electrical connection in fuel injector 2 circuit
  • Faulty Engine Control Module (ECM)

How to Fix Code P1227 BUICK?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

  • Engine Light On (or Service Engine Soon Warning Light)

P1227 BUICK Meaning

The Engine Control Module (ECM) provides voltage to each fuel injector on the positive voltage injector control circuits. The ECM powers each fuel injector by grounding the control circuit for that fuel injector. The ECM monitors the status of the positive voltage injector control circuits and the fuel injector control circuits. When a fuel injector circuit condition is detected by the ECM, the affected fuel injectors will be disabled and may disable the relevant fuel injector group. The Diagnostic Trouble Code (DTC) will be set when the ECM injector output driver detects incorrect current on a fuel injector circuit.

P1227 CADILLAC – Fuel Injector Control Circuit 2 Shorted

🔧 Code P1227 CADILLAC – Fuel Injector #2 Problem

📌 Meaning of Code P1227

Code P1227 is defined when the Engine Control Module (ECM) detects an incorrect current in fuel injector #2 circuit.

The ECM controls each injector by providing power voltage and grounding the control circuit to activate injection. If an anomaly is detected in the injector circuit (such as a short circuit, open circuit, or abnormal current), the DTC P1227 is stored and the injector may be deactivated to protect the engine.

⚠️ Possible Symptoms

  • 🔥 Engine light on (Check Engine)
  • Irregular idle
  • Engine misfiring or running on fewer cylinders
  • Loss of power or poor acceleration
  • Excessive fuel consumption

📍 Possible Causes of Code P1227 CADILLAC

  • 💥 Faulty fuel injector #2
  • 🔌 Injector #2 harness open or shorted
  • ⚡ Faulty electrical connection at injector connector
  • 💻 Faulty ECM (less common, but possible)

🧰 How to Fix Code P1227?

  1. Visual Inspection:
    • Check the condition of injector 2 wiring harness
    • Look for broken, bent, or corroded pins on connectors
  2. Test Injector:
    • Use a multimeter to measure injector resistance (normal values: typically between 12–16 ohms depending on engine)
    • Verify proper power supply and control
  3. Test Circuit:
    • Check continuity between ECM and injector
    • Look for short circuits to ground or +12V
  4. Replace injector if found faulty
  5. Check ECM or reprogram if no hardware issues found elsewhere

💬 Tip

Sometimes this type of failure can be intermittent, caused by a poor connection. A good tip is to gently tap the connector with engine running and observe if the engine reacts (temporary misfires).