P1239 ISUZU Possible Causes

• Faulty high-pressure fuel regulator
• High-pressure fuel regulator harness is open or shorted
• Poor electrical connection in the high-pressure fuel regulator circuit

How is the P1239 ISUZU 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.

Possible Symptoms

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

P1239 ISUZU Meaning

Fuel high-pressure system malfunction is the generic description for the P1239 Isuzu code, but the manufacturer may have a different description for your vehicle model and year. Currently, we have no further information on the P1239 Isuzu OBDII code.

P1239 JEEP Possible Causes

• Engine oil
• Faulty engine oil temperature sensor
• Engine oil temperature sensor harness is open or shorted
• Poor electrical connection in the engine oil temperature sensor circuit
• Faulty Powertrain Control Module (PCM)

How is the P1239 JEEP 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)

P1239 JEEP Meaning

The Engine Oil Temperature (EOT) sensor is a variable resistor that measures the engine oil temperature. The Powertrain Control Module (PCM) provides a 5-volt reference and a ground to the low reference signal sensor circuit. When the oil temperature is low, the sensor resistance is high. When the oil temperature is high, the sensor resistance is low. Diagnostic Trouble Code (DTC) P1239 is set when the engine oil temperature rises slower than a calibrated modeled temperature. When the actual oil temperature falls below the lower limit of the calibrated modeled temperature for three minutes, the fault is set. Fault requires two trips. Three good trips to turn off the MIL.

P1239 MAZDA Possible Causes

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

How is the repair of code P1239 MAZDA 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)

P1239 MAZDA Meaning

Fuel Pump Speed Positive Supply is the generic description for Mazda code P1239, but the manufacturer may have a different description for your vehicle model and year. Currently, we do not have further information on the Mazda OBDII P1239 code.

P1239 MITSUBISHI Possible Causes

• Faulty crankshaft position sensor
• Crankshaft position sensor harness is open or shorted
• Poor electrical connection in crankshaft position sensor circuit

How is code P1239 MITSUBISHI 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)

P1239 MITSUBISHI Meaning

Engine RPM plausibility is the generic description for Mitsubishi code P1239, but the manufacturer may have a different description for your vehicle model and year. Currently, we have no further information about the Mitsubishi P1239 OBDII code.

P1239 NISSAN Possible Causes

• Faulty electronic throttle control actuator (TP sensors 1 and 2)
• Electronic throttle control actuator harness is open or shorted
• Poor electrical connection in the electronic throttle control actuator circuit

How is the P1239 NISSAN 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)

P1239 NISSAN Meaning

The electronic throttle control actuator consists of a throttle control motor, throttle position sensor, etc. The throttle position 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 send 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 so the throttle valve opening angle properly adapts to driving conditions.

P1239 VOLKSWAGEN Possible Causes

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

How is code P1239 VOLKSWAGEN 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.

Possible Symptoms

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

P1239 VOLKSWAGEN Meaning

Injector Circuit Open Cylinder 3 is the generic description for Volkswagen code P1239, but the manufacturer may have a different description for your vehicle model and year. Currently, we have no further information about the Volkswagen P1239 OBDII code.

P123A Possible Causes

• Faulty barometric pressure sensor (BARO)
• Barometric pressure sensor (BARO) harness is open or shorted
• Poor electrical connection in the barometric pressure sensor (BARO) circuit
• Faulty supercharger (SC) boost pressure sensor “A”
• Supercharger (SC) boost pressure sensor “A” harness is open or shorted
• Poor electrical connection in the supercharger (SC) boost pressure sensor “A” circuit

How is code P123A 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)

P123A Meaning

The powertrain control module (PCM) monitors the barometric pressure sensor (BARO) and the turbocharger (TC)/supercharger (SC) boost pressure sensor “A”. The PCM sets the OBDII code when the barometric pressure sensor (BARO) and the turbocharger (TC)/supercharger (SC) boost pressure sensor “A” do not meet factory specifications.

P123A FORD Possible Causes

• Faulty barometric pressure sensor (BARO)
• Barometric pressure sensor (BARO) harness is open or shorted
• Poor electrical connection in the barometric pressure sensor (BARO) circuit
• Faulty supercharger (SC) pressure sensor “A”
• Supercharger (SC) pressure sensor “A” harness is open or shorted
• Poor electrical connection in the supercharger (SC) pressure sensor “A” circuit

How is the P123A 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)

P123A FORD Meaning

The powertrain control module (PCM) monitors the barometric pressure sensor (BARO) and the turbocharger (TC)/supercharger (SC) “A” pressure sensor. The PCM sets the OBDII code when the barometric pressure sensor (BARO) and the turbocharger (TC)/supercharger (SC) “A” pressure sensor do not meet factory specifications.

P123B Possible Causes

• Faulty barometric pressure sensor (BARO)
• Barometric pressure sensor (BARO) harness is open or shorted
• Poor electrical connection in the barometric pressure sensor (BARO) circuit
• Faulty supercharger pressure sensor “A”
• Supercharger pressure sensor “A” harness is open or shorted
• Poor electrical connection in the supercharger pressure sensor “A” circuit

How is code P123B 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.

Possible Symptoms

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

P123B Meaning

The powertrain control module (PCM) monitors the barometric pressure sensor (BARO) and the turbocharger (TC)/supercharger (SC) pressure sensor “B”. The PCM sets the OBDII code when the barometric pressure sensor (BARO) and the turbocharger (TC)/supercharger (SC) pressure sensor “B” do not meet factory specifications.

P123C Possible Causes

• Faulty turbocharger system
• Turbocharger system wiring harness open or shorted
• Poor electrical connection in turbocharger system circuit

How is P123C Code Repair Done?

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.

Possible Symptoms

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

P123C Meaning

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