P1234 LINCOLN – Fuel Pump Control Module Disabled or Offline

P1234 LINCOLN Possible Causes

  • Inertia fuel shutoff (IFS) switch needs to be reset
  • Faulty fuel pump driver module (FPDM)
  • Fuel pump driver module (FPDM) harness is open or shorted
  • Poor electrical connection in the fuel pump driver module (FPDM) circuit
  • Faulty inertia fuel shutoff (IFS) switch
  • Faulty powertrain control module (PCM)

How to Fix Code P1234 LINCOLN?

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

1. Disconnect the inertia switch wiring harness connector

2. Turn the key to the ON position (engine OFF)
3. Measure the circuit voltage between the inertia switch wiring harness connector and ground
4. If battery voltage is detected, replace the inertia switch
5. Clear the codes.

Possible Symptoms

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

P1234 LINCOLN Meaning

The powertrain control module (PCM) monitors the fuel pump monitor (FPM) circuit from the fuel pump driver module (FPDM). When the key is turned on, the FPDM continuously sends a duty cycle signal to the PCM via the FPM circuit. The test fails if the PCM stops receiving the duty cycle signal.

P1234 MAZDA – Fuel Pump Control Module Disabled or Offline

P1234 MAZDA Possible Causes

  • Inertia fuel shutoff (IFS) switch needs to be reset
  • Faulty fuel pump driver module (FPDM)
  • Fuel pump driver module (FPDM) harness is open or shorted
  • Poor electrical connection in the fuel pump driver module (FPDM) circuit
  • Faulty inertia fuel shutoff (IFS) switch
  • Faulty powertrain control module (PCM)

How to Fix Code P1234 MAZDA?

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)

P1234 MAZDA Meaning

The powertrain control module (PCM) monitors the fuel pump monitor (FPM) circuit from the fuel pump driver module (FPDM). When the key is turned on, the FPDM continuously sends a duty cycle signal to the PCM via the FPM circuit. The test fails if the PCM stops receiving the duty cycle signal.

P1234 MERCURY – Fuel Pump Control Module Disabled or Offline

P1234 MERCURY Possible Causes

  • Inertia Fuel Shutoff (IFS) switch needs to be reset
  • Faulty Fuel Pump Driver Module (FPDM)
  • Fuel Pump Driver Module (FPDM) harness is open or shorted
  • Poor electrical connection in the Fuel Pump Driver Module (FPDM) circuit
  • Faulty Inertia Fuel Shutoff (IFS) switch
  • Faulty Powertrain Control Module (PCM)

How to Fix Code P1234 MERCURY?

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

Technical Notes

1. Disconnect the inertia switch wiring harness connector

2. Turn the key to the ON position (engine OFF)
3. Measure the circuit voltage between the inertia switch wiring harness connector and ground
4. If battery voltage is detected, replace the inertia switch
5. Clear the codes.

Possible Symptoms

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

P1234 MERCURY Meaning

The Powertrain Control Module (PCM) monitors the Fuel Pump Monitor (FPM) circuit from the Fuel Pump Driver Module (FPDM). When the key is turned on, the FPDM continuously sends a duty cycle signal to the PCM via the FPM circuit. The test fails if the PCM stops receiving the duty cycle signal.

P1234 MINI – Fuel pump relay activation

P1234 MINI Possible Causes

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

How to Fix P1234 MINI 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.

 
 

Possible Symptoms

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

P1234 MINI Meaning

Fuel pump relay activation is the generic description for P1234 Mini code, but the manufacturer may have a different description for your vehicle model and year. Currently, we don’t have more information about the P1234 Mini OBDII code.

P1234 MITSUBISHI – Throttle Position Sensor Plausibility

P1234 MITSUBISHI Possible Causes

  • Faulty throttle body
  • Faulty sub-throttle position sensor (TPS)
  • Secondary accelerator position harness is open or shorted
  • Poor electrical connection in secondary throttle position circuit

How to Fix MITSUBISHI Code P1234?

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.

Technical Notes

Sub-throttle position sensor (TPS) plausibility

Possible Symptoms

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

P1234 MITSUBISHI Meaning

Sub-throttle position sensor plausibility is the generic description for Mitsubishi code P1234, but the manufacturer may have a different description for your vehicle model and year. Currently, we have no further information about Mitsubishi OBDII code P1234.

P1235 – Fuel Pump Control Out of Range

P1235 Possible Causes

  • Faulty Fuel Pump Driver Module (FPDM)
  • FPDM harness is open or shorted
  • Poor electrical connection in FPDM circuit
  • Faulty Powertrain Control Module (PCM)

How to Fix Code P1235?

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

Possible Symptoms

  • Check Engine Light on (or Service Engine Soon warning light)

P1235 Meaning

The P1235 code indicates that the Fuel Pump Driver Module (FPDM) has detected an invalid or missing fuel pump (FP) circuit signal from the Powertrain Control Module (PCM). The FPDM sends a message to the PCM via the FPM circuit, indicating that this fault has been detected. The PCM sets the DTC when the message is received.

P1235 FORD – Fuel Pump Control Out of Range

P1235 FORD Possible Causes

  • Faulty Fuel Pump Driver Module (FPDM)
  • FPDM harness is open or shorted
  • Poor electrical connection in the FPDM circuit
  • Faulty Powertrain Control Module (PCM)

How to Fix P1235 FORD Code?

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

Technical Notes

Note: For LS6/LS8 and Thunderbird, FPDM functions are integrated into the Rear Electronic Module (REM). Additionally, the REM does not use an FPM circuit. Diagnostic information is sent via the communication link.

Possible Symptoms

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

P1235 FORD Meaning

The P1235 code indicates that the Fuel Pump Driver Module (FPDM) has detected an invalid or missing Fuel Pump (FP) circuit signal from the Powertrain Control Module (PCM). The FPDM sends a message to the PCM via the FPM circuit, indicating that this fault has been detected. The PCM sets the DTC when the message is received.

P1235 CHEVROLET – Injector 5 Output Circuit

P1235 CHEVROLET Possible Causes

  • Faulty fuel injector 5
  • Fuel injector 5 harness is open or shorted
  • Poor electrical connection in fuel injector 5 circuit
  • Faulty Fuel Injection Control Module (FICM)
  • Faulty Engine Control Module (ECM)

How to Fix Code P1235 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

P1235 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.

P1235 GMC – Injector 5 Output Circuit

P1235 GMC Possible Causes

  • Faulty fuel injector 5
  • Fuel injector 5 harness is open or shorted
  • Poor electrical connection in fuel injector 5 circuit
  • Faulty Fuel Injection Control Module (FICM)
  • Faulty Engine Control Module (ECM)

How is GMC Code P1235 Repaired?

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

P1235 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.

P1235 INFINITI – Throttle Position Sensor Circuit Range / Performance

P1235 INFINITI 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 electronic throttle control actuator circuit

How to Fix P1235 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.

Possible Symptoms

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

P1235 INFINITI 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 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 to properly adjust the throttle valve opening angle in response to driving conditions.