P1110 HYUNDAI – Electronic Throttle System – ETS System – Malfunction

P1110 HYUNDAI Possible Causes

Electronic Throttle System (ETS) malfunction
Faulty Electronic Throttle System (ETS) motor
Electronic Throttle System (ETS) motor wiring harness open or short circuit
Electronic Throttle System (ETS) poor electrical connection in motor circuit

How to Fix P1110 HYUNDAI Code?

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

Possible Symptoms

Check engine light illuminated (or service engine soon warning light)

P1110 HYUNDAI Meaning

ETS System – Malfunction is the generic description for Hyundai P1110 code, but the manufacturer may have a different description for your specific vehicle model and year. Currently, we don’t have more information about Hyundai OBDII P1110 code.

P1110 INFINITI – Intake Valve Timing Control, Bank 1

P1110 INFINITI Possible Causes

Faulty intake valve timing control solenoid valve
Intake valve timing control solenoid valve harness is open or shorted
Intake valve timing control solenoid valve may be faulty
Crankshaft position sensor (POS) may be faulty
Camshaft position sensor

How to Fix P1110 INFINITI Code?

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

What Does It Mean?

Since the intake valve timing control solenoid valve uses oil flow to control timing, dirty oil can cause the valve to stick open or closed. Before replacing the valve, change the engine oil and filter and reset the engine code.

When Is the Code Detected?

When there is a discrepancy between the target angle and the phase control angle degree, the valve will stop functioning and the Engine Control Module (ECM) will trigger the P1110 code.

Possible Symptoms

Check Engine Light illuminated (or Service Engine Soon warning light)
Possible engine misfire/loss of power
Possible rough engine idle

P1110 INFINITI Meaning

This mechanism hydraulically controls the cam phases continuously with the fixed operating angle of the intake valve.
The Engine Control Module (ECM) receives signals such as crankshaft position, camshaft position, engine speed, and engine coolant temperature. Then the ECM sends ON/OFF pulse duty signals to the intake valve timing control solenoid valve according to driving conditions. This controls the intake valve closing/opening timing to increase engine torque in the low/mid speed range and output in the high speed range.

The intake valve timing control solenoid valve changes the oil amount and flow direction through the intake valve timing control unit or stops the oil flow. Longer pulse width advances the valve angle. Shorter pulse width retards the valve angle. When ON and OFF pulse widths become equal, the solenoid valve stops the oil pressure flow to fix the intake valve angle at the control position.

P1110 JEEP – Engine Performance Reduction Conditions High IAT Temperature

P1110 JEEP Possible Causes

Faulty intake manifold temperature sensor
Intake manifold temperature sensor harness is open or shorted
Poor electrical connection in intake manifold temperature sensor circuit

How to Fix JEEP P1110 Code?

Possible Symptoms

Check engine light on (or service engine soon warning light)

P1110 JEEP Meaning

The powertrain control module (PCM) monitors the intake manifold temperature sensor. The PCM sets this diagnostic trouble code (DTC) when the intake manifold temperature sensor reading falls outside the acceptable operating range.

P1110 MAZDA – Intake Air Temperature Circuit Open/Short

P1110 MAZDA Possible Causes

Faulty Intake Air Temperature (IAT) sensor
Intake Air Temperature (IAT) sensor harness is open or shorted
Poor electrical connection in the Intake Air Temperature (IAT) sensor circuit

How to Fix P1110 MAZDA Code?

Start by checking the “Possible Causes” listed above. Visually inspect the corresponding wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

Illuminated engine light (or service engine soon warning light)

P1110 MAZDA Meaning

Intake Air Temperature circuit open/short is the generic description for Mazda P1110 code, but the manufacturer may have a different description for your vehicle model and year. Currently, we don’t have more information about Mazda P1110 OBDII code.

P1110 NISSAN – Intake Valve Timing Control, Bank 1

Code Meaning

P1110 indicates a malfunction in the intake valve hydraulic control system (Variable Valve Timing, VVT). The ECM detects a discrepancy between the target cam angle and the actual angle, locking the solenoid valve in the default position.

Common Symptoms

🚨 Check engine light on
⚠️ Loss of power (especially at low/mid RPM)
🔧 Rough idle or vibrations
⛽ Increased fuel consumption

Possible Causes

Priority	Faulty Component
1.	Dirty/low engine oil (main cause!)
2.	Faulty VVT timing solenoid valve
3.	Open/short-circuited electrical circuit (wires, connectors)
4.	Failed crankshaft position sensor (POS)
5.	Faulty camshaft sensor

System Operation

Hydraulic control:
- The ECM uses data from sensors (crankshaft, camshaft, RPM, temperature).
- It sends a PWM signal to the VVT solenoid valve:
  - Long pulse → Advances valve angle.
  - Short pulse → Retards angle.
  - 50% duty cycle → Locks in neutral position.
Effects:
- Optimizes torque (low RPM) and power (high RPM).

Diagnostic Procedure

Step 1: Preliminary checks (80% of cases resolved here!)

✅ Oil check:
- Check level and quality (dirty oil = immediate change + filter).
- If oil pressure light is on: perform manual pressure test.
🔍 Visual inspection:
- VVT solenoid valve cables and connectors (look for bent pins, corrosion, cut wires).

Step 2: Electrical tests

🔌 Solenoid valve test:
- Measure resistance with a multimeter (compare to Nissan specifications).
- Check power supply voltage (12V) and ground.
📡 Sensor signals:
- Check crankshaft/camshaft sensor data via OBD2 scanner.

Step 3: Advanced diagnostics

🔄 Reset and test:
- Clear the code, drive 15 km to check for reappearance.
- If intermittent: monitor real-time data (target vs. actual VVT angle).
⚙️ Hydraulic test:
- Remove solenoid valve, clean oil passages with specialized degreaser.

Repair Solutions

Cause	Action
Dirty oil	Complete oil change + filter + code reset
Faulty solenoid	Replace (average cost: €80-150)
Electrical issue	Repair wires/connectors or replace harness
Faulty sensors	Replace POS or camshaft sensor

Pro Tip:

Always clean the solenoid valve before replacing it! Dirt is often the real culprit.

Check Nissan Technical Service Bulletins (TSB) for recurring failures on your model.

P1110 SAAB – Turbo Boost Air Bypass Valve Performance Problems

P1110 SAAB Possible Causes

Faulty turbocharger bypass air valve
Turbocharger bypass air valve circuit is open or shorted
Poor electrical connection in the turbocharger bypass air valve circuit

How to Fix P1110 SAAB Code?

Possible Symptoms

Check engine light on (or service engine soon warning light)

P1110 SAAB Meaning

Turbocharger bypass air valve performance issues is the generic description for P1110 Saab code, but the manufacturer may have a different description for your specific vehicle model and year. Currently, we don’t have more information about the OBDII P1110 Saab code.

P1110 VOLKSWAGEN – HO2S Heater Circuit, Bank 2 Sensor 2, Short to Positive

P1110 VOLKSWAGEN Possible Causes

Faulty Heated Oxygen Sensor (HO2S) Heater Control Circuit, Bank 2 Sensor 2
Open or shorted Heated Oxygen Sensor (HO2S) Heater Control Circuit Bank 2 Sensor 2 harness
Heated Oxygen Sensor (HO2S) Heater Control Circuit Bank 2 Sensor 2 circuit poor electrical connection

How to Fix Code P1110 VOLKSWAGEN?

Possible Symptoms

Illuminated engine light (or service engine soon warning light)

P1110 VOLKSWAGEN Meaning

HO2S Heater Control Circuit Bank 2 Sensor 2 Short to Positive is the generic description for Volkswagen code P1110, but the manufacturer may have a different description for your specific vehicle model and year. Currently, we do not have more information about the Volkswagen OBDII code P1110.

P1111 – Intake Valve Control Solenoid Circuit, Bank 1

P1111 Possible Causes

Faulty intake valve timing control solenoid valve, bank 1
Open or short circuit in bank 1 intake valve timing control solenoid harness
Poor electrical connection in bank 1 intake valve timing control solenoid circuit

How to Fix Code P1111?

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

What Does It Mean?

Since the intake valve timing control solenoid uses oil flow to control timing, dirty oil can cause the valve to stick open or closed. Before replacing the valve, change the engine oil and filter and reset the engine code. If the code returns, you can remove the intake valve timing control solenoid and clean it with brake cleaner.

Possible Symptoms

Engine light on (or service engine soon warning light)
Possible engine power loss/reduced power
Possible rough engine idle

P1111 Meaning

The intake valve timing control solenoid is activated by pulse width modulation (duty cycle) on/off signals from the engine control module (ECM). The intake valve timing control solenoid changes the oil quantity and flow direction through the intake valve timing control unit or stops oil flow.

Longer pulse width advances the valve angle. Shorter pulse width retards the valve angle.
When ON and OFF pulse widths become equal, the solenoid stops oil pressure flow to lock the intake valve angle at the control position.
Diagnostic trouble code (DTC) sets when incorrect voltage is sent to the ECM through the intake valve timing control solenoid.

P1111 ACURA – Intermittent High Voltage in Intake Air Temperature Sensor Circuit

P1111 ACURA Possible Causes

Faulty intake air temperature sensor
Intake air temperature sensor harness is open or shorted
Poor electrical connection in the intake air temperature sensor circuit

How to Fix P1111 ACURA Code?

When is the Code Detected?

The P1111 code is set when the Powertrain Control Module (PCM) detects a signal voltage outside the normal operating range of the sensor.

Possible Symptoms

Illuminated engine light (or service engine soon warning light)

P1111 ACURA Meaning

The Intake Air Temperature (IAT) sensor contains a semiconductor device that changes resistance based on temperature (a thermistor). The IAT sensor is mounted in the air intake passage of the engine’s air intake system. The IAT sensor has a signal circuit and a ground circuit. The Powertrain Control Module (PCM) applies a voltage (approximately 5.0 volts) to the sensor’s signal circuit. The PCM monitors changes in this voltage caused by changes in the sensor’s resistance to determine the intake air temperature.

When the intake air is cold, the sensor’s resistance (thermistor) is high and the PCM signal voltage is only slightly lowered across the sensor to ground. The PCM detects a high signal voltage (low temperature). When the intake air is hot, the sensor’s resistance is low and the signal voltage is lowered more. This causes the PCM to detect a low signal voltage (high temperature).

P1111 AUDI – Bank 1 HO2S Control System Too Lean

P1111 AUDI Possible Causes

Faulty HO2 Sensor, Bank 1
Open or Short Circuit in HO2 Sensor Wiring, Bank 1
Poor Electrical Connection in HO2 Sensor Circuit, Bank 1

How to Fix P1111 AUDI Code?

Possible Symptoms

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

P1111 AUDI Meaning

HO2S Control Bank 1 System Too Lean is the generic description for Audi P1111 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 P1111 OBDII code.