P1264 is a manufacturer-specific OBD-II diagnostic trouble code. Its exact definition depends on the vehicle application, commonly relating to a cylinder #4 fuel injector circuit fault or an intake manifold tuning valve issue.
Because definitions vary by manufacturer, the exact diagnostic path requires verifying your specific vehicle’s factory service information. The code identifies a detected electrical condition, not necessarily a failed part.
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Key Takeaways
- P1264 is a manufacturer-specific code indicating a fault in a fuel injector circuit, intake manifold valve, or related wiring.
- Possible causes include damaged wiring, corroded connectors, or internal solenoid and injector coil failures.
- Symptoms may include engine misfires on cylinder #4, rough idling, reduced power, and an illuminated check engine light.
- Diagnosis requires verifying the exact factory definition and testing the relevant electrical circuits and components.
P1264 Code Description and Implications
P1264 is a manufacturer-specific code, meaning its exact definition varies by automaker. The powertrain control module uses this code to flag an anomaly within a specific fuel delivery or intake management system.
Some Ford applications: P1264 indicates a high to low side short or open in the cylinder #4 fuel injector circuit. The module detects an abnormal electrical condition in the injector control wiring.
Certain GM and Chevrolet applications: This code may point to a fault in the Intake Manifold Tuning (IMT) valve solenoid circuit or an intake manifold runner control issue.
Because the code is manufacturer-specific, you must verify the exact factory definition for your vehicle before beginning diagnosis. The specific error code meaning dictates the test.
Common Causes of the P1264 Code
Wiring and connector damage: Harnesses routing to fuel injectors or intake solenoids are exposed to engine heat and vibration. Chafed wires or corroded pins can create a short circuit or interrupt the signal.
Component failure: The internal electromagnetic coil of the fuel injector or the IMT valve solenoid may fail internally, creating a short or open circuit that the module detects.
Control module issues: In rare cases, a faulty powertrain control module or a failed injector driver circuit within the module can trigger this electrical fault code.
Symptoms Associated With P1264
Because this code affects fuel delivery or intake airflow, symptoms depend on the vehicle’s specific implementation.
On fuel injector applications, you may experience engine misfires on cylinder #4, rough idling, hesitation during acceleration, and decreased fuel economy.
On intake manifold tuning applications, you may notice reduced engine power or poor acceleration as the intake runners fail to adjust for optimal airflow.
You will see an illuminated check engine light across most applications when this code is stored.
Diagnosing the P1264 Trouble Code
Diagnosis must begin by confirming the exact factory definition and wiring diagram for your specific make, model, and year. Retrieve freeze frame data to understand the conditions when the code set.
For injector circuit applications, inspect the wiring harness and connectors at cylinder #4 for physical damage, chafing, or moisture intrusion. Use a multimeter to measure the injector coil resistance and check for shorts to ground or voltage.
For IMT valve applications, inspect the solenoid connector and test the valve’s internal resistance against the manufacturer’s specifications.
Repairing the P1264 Issue
Repairs must follow confirmed diagnostic testing. Do not replace the fuel injector or intake solenoid without verifying the wiring harness and control circuits first.
If wiring damage or corrosion is found, repair the harness and clean the connectors. Ensure the wiring is routed away from hot exhaust components.
If the injector coil or IMT solenoid fails electrical testing, replace it with a component meeting the exact vehicle specification, then clear the codes.
Cost Considerations for P1264 Repairs
Repair costs depend on the confirmed root cause, component accessibility, and local labor rates. Repairing a damaged wire can be straightforward.
If a fuel injector requires replacement, especially on engines where the intake manifold must be removed for access, parts and labor costs will increase. Factor in the cost of proper diagnostic time.
Prevention Strategies for Future Occurrences
Inspecting exposed wiring and electrical connectors during routine maintenance can help identify developing damage or corrosion before it causes a short circuit.
Ensuring that wiring harnesses are properly secured and routed away from sharp edges or excessive heat sources helps prevent chafing and insulation failure.
Troubleshooting Tips and Best Practices
Always verify the exact definition of P1264 for your specific vehicle. Assuming it is always a failed fuel injector can lead to misdiagnosis when an intake manifold solenoid or wiring issue is the actual cause.
Do not ignore related misfire codes. If P1264 is accompanied by a cylinder #4 misfire code, it strongly supports an injector circuit fault on Ford applications.
Check for technical service bulletins related to injector harness chafing or intake manifold solenoid failures for your specific model year.
More OBD-II Codes
| P1263 | P1262 | P1261 | P1260 |
| P1259 | P1258 | P1265 | P1266 |
| P1267 | P1268 | P1269 | P1270 |
| P0204 | P0304 | P1271 | P1272 |
| P1273 | P1274 | P1275 | P1276 |
| P1277 | P1278 | P1280 | P1281 |
Frequently Asked Questions
Is P1264 a generic or manufacturer-specific code?
No. P1264 is a manufacturer-specific code. Its exact definition and diagnostic procedure vary depending on the vehicle make, model, and year. Always consult the factory service information.
Can a bad fuel injector cause a P1264 code?
On Ford applications where P1264 relates to the fuel injector circuit, a failed internal injector coil can create a short circuit. However, wiring damage is also a possible cause.
Is it safe to drive with a P1264 code?
Driving is not recommended if the engine is misfiring severely or running poorly. Unburned fuel from a misfiring cylinder can quickly overheat and damage the catalytic converter.
Will replacing the injector always fix P1264?
Not always. P1264 indicates an electrical circuit fault. The root cause could be chafed wiring, a corroded connector, or a failed module driver. Proper electrical testing is required first.
Can an intake manifold tuning valve trigger P1264?
On certain GM applications, P1264 specifically identifies a fault in the Intake Manifold Tuning (IMT) valve solenoid circuit. A failed solenoid or wiring issue will trigger this code.
What Should You Do About the P1264 Code?
Confirm the exact factory definition and wiring diagram for your specific vehicle application. Inspect the relevant fuel injector circuits, intake solenoids, and connectors for physical damage or short circuits.
Perform targeted electrical testing on the relevant system and components to isolate the fault. Repair the confirmed root cause, then verify the repair by clearing the codes and monitoring live data.
