P1278 CHRYSLER Possible Causes

• Faulty starter relay
• Defective starter
• Starter wiring harness is open or short-circuited
• Poor electrical connection in the starter circuit

How is the P1278 CHRYSLER code repaired?

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

When is the code detected?

The starter status is not equal to the desired status

Possible Symptoms

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

P1278 CHRYSLER Meaning

The Powertrain Control Module (PCM) monitors the starter. The PCM sets the OBDII code when the starter does not meet factory specifications.

P1278 DODGE Possible Causes

• Faulty starter relay
• Defective starter
• Starter wiring harness is open or short-circuited
• Poor electrical connection in the starter circuit

How is the P1278 DODGE code repaired?

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

When is the code detected?

The starter status is not equal to the desired status

Possible Symptoms

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

P1278 DODGE Meaning

The Powertrain Control Module (PCM) monitors the starter. The PCM sets the OBDII code when the starter does not meet factory specifications.

P1278 FORD Possible Causes

• Faulty fuel injector
• Faulty Injector Driver Module (IDM)
• Fuel injector harness is open or shorted
• Poor electrical connection in the fuel injector circuit

How is the P1278 FORD code repaired?

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

Possible Symptoms

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

P1278 FORD Meaning

The Injector Control Module (IDM) is capable of detecting individual injector open circuits and short circuits to ground or power while the engine is running. The Injector Control Module is also capable of detecting open circuits or short circuits to ground in the left or right bank high side circuit. The Diagnostic Trouble Code (DTC) indicates a low to high side open circuit between the Injector Control Module and the injector.

P1278 GMC Possible Causes

• Faulty Accelerator Pedal Position (APP)
• Accelerator Pedal Position harness is open or shorted
• Poor electrical connection in the Accelerator Pedal Position circuit

How is the P1278 GMC code repaired?

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

When is the code detected?

The Engine Control Module (ECM) detected a voltage below 0.2 volts or above 4.25 volts on the APP signal

Possible Symptoms

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

P1278 GMC Meaning

The Accelerator Pedal Position (APP) sensors are located in the Throttle Actuator Control (TAC) module assembly. The TAC module assembly is mounted on the accelerator pedal bracket. There are 3 individual APP sensors in the TAC module. Three separate signal circuits, low reference circuits, and 5-volt reference circuits are used to determine the accelerator pedal position. The APP sensor signal voltages increase when the accelerator pedal is pressed.

P1278 INFINITI Possible Causes

• Faulty Air/Fuel Ratio (A/F) Sensor 1 Bank 1
• Air/Fuel Ratio (A/F) Sensor 1 Bank 1 Wiring Harness or Connectors Open or Short-Circuited
• Air/Fuel Ratio (A/F) Sensor 1 Bank 1 Circuit Poor Electrical Connection
• Fuel Pressure
• Faulty Fuel Injector
• Intake Air Leaks
• Exhaust Gas Leaks
• Faulty Mass Air Flow Meter

How is the P1278 INFINITI Code Repaired?

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

When is the Code Detected?

The response (from RICH to LEAN) of the A/F signal calculated by the ECM from the A/F Sensor 1 signal takes longer than the specified time.

Possible Symptoms

• Engine Light On (or Service Engine Soon Warning Light)
• Possible Rough Engine Idle

P1278 INFINITI Meaning

The A/F sensor is a planar dual-cell limit current sensor. The sensor element of the A/F sensor combines a Nernst concentration cell (sensor cell) with an oxygen pump cell, which transports ions. It has a heating element within the element.
The sensor is capable of accurately measuring λ=1, but also in the lean and rich ranges. With its control electronics, the sensor provides a clear and continuous signal over a wide λ range (0.7 < λ < air).
The exhaust gas components diffuse through the diffusion gap at the oxygen pump electrode and the Nernst concentration cell, where they are brought to thermodynamic equilibrium.
An electronic circuit controls the pump current through the oxygen pump cell so that the composition of the exhaust gases in the diffusion gap remains constant at λ=1. Therefore, the A/F sensor can indicate the air/fuel ratio through this pump current. Additionally, a heating element is integrated into the sensor to ensure the required operating temperature of 700 to 800°C (1,292 to 1,472°F).

P1278 LEXUS Possible Causes

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

How is the repair of code P1278 LEXUS performed?

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

Possible Symptoms

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

P1278 LEXUS Meaning

Port 3 injector circuit number is the generic description for Lexus code P1278, but the manufacturer may have a different description for your vehicle model and year. Currently, we do not have additional information about the Lexus P1278 OBDII code.

P1278 NISSAN Possible Causes

• Faulty Air/Fuel Ratio (A/F) Sensor 1 Bank 1
• Air/Fuel Ratio (A/F) Sensor 1 Bank 1 wiring harness or connectors open or shorted
• Air/Fuel Ratio (A/F) Sensor 1 Bank 1 circuit poor electrical connection
• Fuel pressure
• Faulty fuel injector
• Intake air leaks
• Exhaust gas leaks
• Faulty PCV
• Faulty mass air flow meter

How is P1278 NISSAN code repair performed?

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

When is the code detected?

The response (from RICH to LEAN) of the A/F signal calculated by the ECM from A/F Sensor 1 signal takes longer than the specified time.

Possible Symptoms

• Engine light on (or service engine soon warning light)
• Possible rough engine idle

P1278 NISSAN Meaning

The A/F sensor is a planar dual-cell limit current sensor. The sensor element of the A/F sensor combines a Nernst concentration cell (sensor cell) with an oxygen pump cell, which transports ions. It contains a heating element within the element.
The sensor can accurately measure λ=1, as well as in both lean and rich ranges. With its control electronics, the sensor provides a clear and continuous signal across a wide λ range (0.7 < λ < air).
Exhaust gas components diffuse through the diffusion gap at the oxygen pump electrode and Nernst concentration cell, where they reach thermodynamic equilibrium.
An electronic circuit controls the pump current through the oxygen pump cell so that the exhaust gas composition in the diffusion gap remains constant at λ=1. Therefore, the A/F sensor can indicate the air/fuel ratio through this pumping current. Additionally, a heating element is integrated into the sensor to maintain the required operating temperature of 700 to 800°C (1,292 to 1,472°F).

P1278 TOYOTA Possible Causes

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

How is the repair of code P1278 TOYOTA performed?

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

Possible Symptoms

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

P1278 TOYOTA Meaning

Port 3 injector circuit number is the generic description for Toyota code P1278, but the manufacturer may have a different description for your vehicle model and year. Currently, we have no further information about the Toyota P1278 OBDII code.

P1278 VOLKSWAGEN Possible Causes

• Faulty fuel metering solenoid
• Fuel metering solenoid harness is open or shorted
• Poor electrical connection in fuel metering solenoid circuit

How is P1278 VOLKSWAGEN Code Repair Done?

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.

Possible Symptoms

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

P1278 VOLKSWAGEN Meaning

Fuel metering solenoid short to positive is the generic description for Volkswagen P1278 code, but the manufacturer may have a different description for your vehicle model and year. Currently, we have no further information about the Volkswagen P1278 OBDII code.

P1279 Possible Causes

• Faulty Air/Fuel Ratio (A/F) Sensor 1 Row 1
• Air/Fuel Ratio (A/F) Sensor 1 Bank 1 harness or connectors are open or short-circuited
• Air/Fuel Ratio (A/F) Sensor 1 Bank 1 circuit poor electrical connection
• Fuel pressure
• Faulty fuel injector
• Intake air leaks
• Exhaust gas leaks
• Faulty PCV
• Faulty mass air flow meter

How is P1279 Code Repair Performed?

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.

When is the Code Detected?

The response (from RICH to LEAN) of the A/F signal calculated by the ECM from the A/F Sensor 1 signal takes longer than the specified time.

Possible Symptoms

• Engine light on (or service engine soon warning light)
• Possible rough engine idle

P1279 Meaning

The A/F sensor is a planar dual-cell limit current sensor. The sensor element of the A/F sensor combines a Nernst concentration cell (sensor cell) with an oxygen pump cell, which transports ions. It has a heating element within the element.
The sensor is capable of accurately measuring λ=1, but also in the lean and rich ranges. With its control electronics, the sensor emits a clear and continuous signal over a wide λ range (0.7 < λ < air).
The exhaust gas components diffuse through the diffusion gap at the oxygen pump electrode and the Nernst concentration cell, where they are brought to thermodynamic equilibrium.
An electronic circuit controls the pump current through the oxygen pump cell so that the composition of the exhaust gases in the diffusion gap remains constant at λ=1. Therefore, the A/F sensor is able to indicate the air/fuel ratio through this pump current. Additionally, a heating element is built into the sensor to ensure the required operating temperature of 700 to 800°C (1,292 to 1,472°F).