P1263 FORD – Cylinder #3 High to Low Side Short

Meaning of FORD Code P1263

This code indicates a problem in the fuel injector circuit #3. Piezoelectric injectors deliver a precise amount of fuel into the combustion chamber. The PCM controls their activation (duration: 0 to 400 microseconds). If the injector interface module detects an anomaly in the secondary circuit (rear injector), code P1263 is displayed.

Symptoms of Code P1263

  • Check engine light on (or “Service Engine Soon”)

  • Rough idle

  • Loss of power

  • Increased fuel consumption

  • Misfires (especially on the affected cylinder)

Possible Causes of FORD P1263

  1. Faulty fuel injector #3

  2. Damaged injector #3 wiring harness (open circuit or short circuit)

  3. Poor electrical connection (corrosion, bent pins, loose connector)

  4. Faulty injector interface module

  5. Ground or power supply issue

Diagnosis and Repair of Code P1263

1. Visual inspection of the injector circuit

  • Check the wiring harness and connectors (especially under the valve cover).

  • Look for cut, burned, or exposed wires.

  • Inspect the connector pins (broken, bent, oxidized).

2. Testing injector #3

  • Measure the injector resistance (compare with manufacturer specifications).

  • Use an oscilloscope to check the control signal.

  • If faulty, replace the injector.

3. Checking the injector interface module

  • Test the module’s power supply and ground.

  • If necessary, replace the module.

4. PCM check

  • Check for related codes and real-time data with an OBD2 scanner.

  • If the problem persists, PCM reprogramming or replacement may be necessary.

Common Repairs

✅ Replacement of faulty injector #3
✅ Repair of damaged wiring harness
✅ Cleaning or replacement of oxidized connectors
✅ Replacement of injector interface module
✅ PCM update or replacement

Conclusion

Code FORD P1263 indicates a problem in injector #3 circuit. A thorough inspection of wiring and connectors is essential before replacing expensive parts. If the problem persists, consult a specific repair manual or a qualified mechanic.

🔧 Technical tip: Use a multimeter and an oscilloscope for accurate diagnosis.

P1263 JEEP – Glow plug control circuit #2 low

P1263 JEEP Possible Causes

  • Faulty glow plug #2
  • Glow plug #2 harness is open or shorted
  • Poor electrical connection in glow plug #2 circuit
  • Faulty glow plug controller

How is code P1263 JEEP 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)

P1263 JEEP Meaning

Glow plugs are used to preheat the combustion chambers to reach the required ignition temperature for the air-fuel mixture.
The glow plug consists of a housing with a female thread and a tightly fitted rod. The heating element is integrated into the glow plug rod. It consists of a heating coil and a control coil connected in series.
When the glow plug system is activated, a current of approximately 30 amps flows to each glow plug. The heating coil heats the glow plug. The control coil increases its resistance as the temperature rises and limits the current to approximately 15-25 amps. This protects the glow plug from overloads.

P1263 MAZDA – Cylinder #3 High to Low Side Short

P1263 MAZDA Possible Causes

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

How is P1263 MAZDA Code Repaired?

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)

P1263 MAZDA Meaning

Fuel injectors are connected to the high-pressure injection rail and deliver a calibrated amount of fuel directly into the combustion chamber. The piezo actuator is controlled by the PCM during the main injection step for about 0 to 400 microseconds. The activation and deactivation times of the fuel injectors are controlled by the piezo actuator device which allows extreme precision during the injection cycle. The diagnostic trouble code (DTC) is detected by the fuel injector interface module in the secondary (rear) fuel injector circuit.

P1263 SAAB – Throttle valve manually adjusted while engine running

P1263 SAAB Possible Causes

  • Faulty throttle body
  • Throttle body harness is open or shorted
  • Poor electrical connection in the throttle body circuit
 

How is the P1263 SAAB code repaired?

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

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

P1263 SAAB Meaning

Throttle manually moved during engine operation is the generic description for Saab P1263 code, but the manufacturer may have a different description for your vehicle model and year. Currently, we have no further information about the Saab P1263 OBDII code.

P1263 VOLKSWAGEN – Injector 2 Signal Implausible

P1263 VOLKSWAGEN Possible Causes

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

How is the P1263 VOLKSWAGEN 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)

P1263 VOLKSWAGEN Meaning

Injector 2 Implausible Signal is the generic description for Volkswagen code P1263, but the manufacturer may have a different description for your vehicle model and year. Currently, we have no further information about the Volkswagen P1263 OBDII code.

P1264 – Cylinder #4 Top to Bottom Short Side

P1264 Possible Causes

  • Faulty fuel injector 4
  • Fuel injector 4 harness is open or shorted
  • Poor electrical connection in fuel injector 4 circuit
  • Faulty fuel injector interface module

How is code P1264 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)

P1264 Meaning

Fuel injectors are connected to the high-pressure injection rail and deliver a calibrated amount of fuel directly into the combustion chamber. The piezo actuator is controlled by the PCM during the main injection step for about 0 to 400 microseconds. The activation and deactivation times of the fuel injectors are controlled by the piezo actuator device, which allows for extreme precision during the injection cycle. The Diagnostic Trouble Code (DTC) is detected by the fuel injector interface module in the secondary (rear) fuel injector circuit.

P1264 AUDI – Injector 2 Control Limit Exceeded

P1264 AUDI Possible Causes

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

How is the P1264 AUDI 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)

P1264 AUDI Meaning

Injector 2 Control Limit Exceeded is the generic description for the Audi P1264 code, but the manufacturer may have a different description for your vehicle model and year. Currently, we have no further information on the Audi P1264 OBDII code.

P1264 FORD – Cylinder #4 High to Low Side Short

The P1264 error code on Ford vehicles indicates a potential problem with fuel injector number 4. Several factors can cause this code:

  • Faulty fuel injector 4: The injector itself may be out of order.
  • Fuel injector 4 wiring issues: The wiring harness may be interrupted (open) or short-circuited.
  • Poor electrical connection: A faulty electrical contact at the connector of injector 4.
  • Failed fuel injector interface module: The module controlling the injector may be defective.

How to fix the P1264 code on a FORD?

The first step is to carefully examine the possible causes mentioned above. Start with a visual inspection of the wiring harness and connectors associated with fuel injector number 4. Be attentive to any signs of damage on the cables and check the condition of the connector pins: ensure they are not broken, bent, pushed in, or corroded.

Important technical note:

It is crucial to prioritize checking the connections of the wiring harness located at the valve cover, including those under the valve cover itself.

Symptoms associated with code P1264:

The most common symptom is the illumination of the engine light (or the “Service Engine Soon” warning light).

Meaning of code P1264 in FORD:

Fuel injectors are supplied with high-pressure fuel via the injection rail and are responsible for injecting a precise amount of fuel directly into the combustion chamber. The injector actuation is achieved by a piezoelectric system, controlled by the Powertrain Control Module (PCM). During the main injection phase, the activation duration is approximately 0 to 400 microseconds. The accuracy of the injection cycle is ensured by the precise control of the injectors’ opening and closing times through the piezoelectric actuator. The P1264 error code is detected by the fuel injector interface module when it identifies a problem in the secondary fuel injector circuit (usually the injector located at the rear, in this case, injector number 4).

P1264 JEEP – Glow Plug Circuit #3

P1264 JEEP Possible Causes

  • Faulty glow plug #3
  • Glow plug #3 harness is open or shorted
  • Poor electrical connection in glow plug #3 circuit
  • Faulty glow plug controller

How is code P1264 JEEP 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)

P1264 JEEP Meaning

Glow plugs are used to preheat the combustion chambers to reach the required ignition temperature for the air-fuel mixture.
The glow plug consists of a housing with a female thread and a tightly fitted rod. The heating element is integrated into the glow plug rod. It consists of a heating coil and a control coil connected in series.
When the glow plug system is activated, a current of approximately 30 amps flows to each glow plug. The heating coil heats the glow plug. The control coil increases its resistance as the temperature rises and limits the current to about 15-25 amps. This protects the glow plug from overloads.

P1264 MAZDA – Cylinder #4 High to Low Side Short

P1264 MAZDA Possible Causes

  • Faulty fuel injector 4
  • Fuel injector 4 harness is open or shorted
  • Poor electrical connection in fuel injector 4 circuit
  • Faulty fuel injector interface module

How is the P1264 MAZDA code repair 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)

P1264 MAZDA Meaning

Fuel injectors are connected to the high-pressure injection rail and deliver a calibrated amount of fuel directly into the combustion chamber. The piezo actuator is controlled by the PCM during the main injection stage for approximately 0 to 400 microseconds. The activation and deactivation times of the fuel injectors are controlled by the piezo actuator device, which allows for extreme precision during the injection cycle. The diagnostic trouble code (DTC) is detected by the fuel injector interface module in the secondary (rear) fuel injector circuit.