P1244 is a manufacturer-specific OBD-II diagnostic trouble code. Because it is manufacturer-specific, its exact definition depends entirely on the vehicle application, ranging from generator load input faults to throttle position issues.
The exact application must be verified before diagnosis. The code indicates the control module detected a fault, but testing is required to identify the root cause and the specific affected component.
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Key Takeaways
- P1244 is a manufacturer-specific code, meaning its exact definition varies by automaker and vehicle application.
- On Ford, GM, and Hyundai applications, it typically indicates an alternator or generator load input failed high.
- On Honda applications, it points to a closed throttle position insufficient fault.
- Diagnosis requires verifying the exact factory definition and testing the relevant charging system or throttle circuits.
P1244 Code Description and Implications
P1244 is a manufacturer-specific powertrain code. Because the second digit is “1”, the definition is controlled by the automaker rather than the SAE standardized list.
Some Ford, GM, and Hyundai applications: P1244 indicates Alternator Load Input Failed High or Generator Load Input High Voltage. The PCM detects that the load signal from the alternator is higher than the expected calibrated range.
Some Honda applications: P1244 indicates Closed Throttle Position Insufficient. The ECM detects that the throttle plate is not returning to or resting at the proper closed position.
When the control module detects an unexpected signal, it sets these trouble codes.
Common Causes of the P1244 Code
Possible causes depend entirely on the specific vehicle application.
For Ford, GM, and Hyundai charging system applications, a failing alternator voltage regulator, damaged wiring between the alternator and PCM, poor electrical grounds, or a failing PCM driver can trigger the high input fault.
For Honda throttle applications, carbon buildup binding the throttle plate, a failing throttle body assembly, misadjusted throttle stop screw, or damaged throttle position sensor wiring can cause the fault.
Symptoms Associated With P1244
On Ford, GM, and Hyundai applications, symptoms may include an illuminated battery warning light, dimming or flickering headlights, and a discharged battery due to improper charging system operation.
On Honda applications, drivers may experience rough idling, stalling when coming to a stop, or hesitation during initial acceleration.
Diagnosing the P1244 Trouble Code
Diagnosis must begin by confirming the exact factory definition for the specific make, model, and year.
For charging system applications, technicians inspect the alternator wiring and connectors. They use a multimeter to test the generator load input circuit for shorts to voltage and verify the alternator’s output under electrical load.
For Honda throttle applications, technicians inspect the throttle body for carbon buildup. They verify the throttle plate movement and test the closed throttle position switch or sensor circuit for proper operation.
Repairing the P1244 Issue
If the alternator voltage regulator or wiring fails testing on a Ford, GM, or Hyundai application, repairing the harness or replacing the alternator assembly resolves the load input fault.
If the throttle body is bound by carbon or the sensor fails testing on a Honda application, cleaning the throttle body or replacing the confirmed failed component resolves the insufficient closed position fault.
Cost Considerations for P1244 Repairs
Repair costs vary depending on the underlying fault and the vehicle application.
Replacing an alternator or repairing external wiring involves standard parts and labor. Cleaning a throttle body involves minimal parts cost, while replacing a throttle body assembly requires more parts cost and potential relearn procedures.
Cost depends on diagnostic time, component accessibility, required parts, programming requirements, and labor.
Prevention Strategies for Future Occurrences
Some electrical and mechanical failures cannot be reliably prevented.
Inspecting exposed engine bay wiring and keeping alternator connectors clean and sealed can help prevent moisture intrusion and corrosion that lead to circuit faults.
Using top-tier fuel and performing regular induction system cleanings can help prevent carbon buildup that binds throttle plates on affected applications.
Troubleshooting Tips and Best Practices
Never assume a manufacturer-specific code has a universal meaning. Always verify the exact factory service information for your specific vehicle.
Do not replace an alternator or throttle body without first verifying the wiring, connectors, and live data signals.
If P1244 is accompanied by other charging system codes on a Ford, suspect a shared wiring harness issue or a failing battery rather than multiple simultaneous component failures.
More OBD-II Codes
| P1243 | P1240 | P1237 | P1234 |
| P1231 | P1228 | P1245 | P1250 |
| P1251 | P1252 | P1253 | P1254 |
| P0562 | P0563 | P0620 | P0621 |
| P0622 | P0625 | P1227 | P1226 |
| P1225 | P1224 | P1223 | P1222 |
Frequently Asked Questions
Is P1244 a generic OBD-II code?
No. P1244 is a manufacturer-specific code, meaning its exact definition and diagnostic procedure depend entirely on the vehicle’s make, model, and application.
Can I drive my vehicle with a P1244 code?
It depends on the application. If it causes the battery to stop charging on a Ford or GM, the vehicle will eventually stall. On a Honda, it may cause stalling at idle.
Will a P1244 code trigger the battery warning light?
Yes. On applications where P1244 indicates a generator or alternator load input fault, the PCM will typically command the battery or charging system warning light to illuminate.
Does P1244 always mean the alternator is broken?
No. The code often points to damaged wiring, corroded connectors, or a poor ground connection rather than a mechanically or internally failed alternator or generator.
How do I clear a manufacturer-specific P1244 code?
Clearing the code requires fixing the underlying charging system, wiring, or throttle fault. Simply using a scan tool to erase the code will not repair the root cause.
What Should You Do About the P1244 Code?
Confirm the exact factory definition for your specific vehicle, then follow the applicable manufacturer diagnostic procedure for the relevant system and components.
Because P1244 is manufacturer-specific, testing the exact alternator load circuits or throttle position sensors identified by the factory service information is required to find the root cause.
Once the fault is confirmed, perform the necessary repairs and verify the fix by clearing the codes and completing a test drive.
