Diagnostic trouble code P1104 is a manufacturer-specific powertrain error code. Because it is manufacturer-specific, its exact definition depends entirely on the vehicle make, model, and application.
Exact vehicle application must be verified before diagnosis. The code identifies a detected condition in a specific subsystem, but further testing is required to identify the root cause.
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Key Takeaways
- P1104 is a manufacturer-specific code, meaning its definition varies between automakers like Ford, Infiniti, and Mitsubishi.
- Possible causes depend on the vehicle and may include mass airflow sensor ground faults, manifold absolute pressure sensor issues, or turbocharger solenoid faults.
- Symptoms vary by application but can include an illuminated Check Engine Light, poor engine performance, or boost control concerns.
- Diagnosis requires verifying the exact factory definition for the specific vehicle and following the manufacturer’s targeted testing procedures.
- Repairs depend on the confirmed root cause and may involve repairing wiring, replacing a specific sensor, or addressing turbocharger components.
P1104 Code Description and Implications
Because P1104 is manufacturer-specific, there is no single universal definition. The exact monitored system and fault condition depend on the vehicle make and model.
Some Ford applications: P1104 indicates a “Mass Airflow (MAF) Sensor Ground Malfunction,” where the engine control module detects an issue with the sensor ground circuit.
Certain Infiniti and Nissan applications: P1104 designates a “Manifold Absolute Pressure (MAP) Sensor Low Voltage” fault, indicating the sensor signal dropped below the expected minimum threshold.
Specific Mitsubishi applications: P1104 can indicate a “Turbocharger Wastegate Solenoid” circuit fault, where the module cannot detect the solenoid electrically.
Common Causes of the P1104 Code
The underlying cause depends entirely on the verified factory definition for the specific vehicle application.
For Ford applications monitoring the MAF sensor ground, possible causes include a broken ground wire, corroded connector pins, or a failed sensor element internally shorting the ground circuit.
For Infiniti and Nissan applications, causes involve a failed MAP sensor, damaged wiring harness, poor electrical grounds, or severe vacuum leaks affecting manifold pressure readings.
For Mitsubishi applications monitoring the wastegate solenoid, causes may include a failed solenoid coil, damaged wiring, or a blown fuse in the boost control circuit.
Symptoms Associated With P1104
Symptoms vary widely depending on the underlying system fault and the vehicle manufacturer.
On applications with a MAF sensor ground fault, symptoms can include an illuminated Check Engine Light, rough idling, engine hesitation, or stalling due to incorrect air-fuel mixture calculations.
On applications with a MAP sensor low voltage fault, the vehicle may experience poor acceleration, rich or lean fuel trims, and decreased fuel efficiency.
On applications with a wastegate solenoid fault, the driver may notice a lack of boost pressure, reduced engine power under load, or an illuminated Check Engine Light.
Diagnosing the P1104 Trouble Code
Diagnosis must begin by confirming the exact factory definition for the specific make, model, and year. Attempting to diagnose a MAP sensor on a vehicle where P1104 indicates a MAF ground circuit will lead to misdiagnosis.
For MAF sensor ground applications, technicians inspect the sensor connector for corrosion and measure the ground circuit for continuity and resistance using a multimeter.
For MAP sensor applications, diagnosis involves checking the sensor reference voltage, signal circuit, and ground, while comparing live data against known barometric pressure values.
For wastegate solenoid applications, testing involves measuring the solenoid coil resistance and verifying the power and ground circuits to the component.
Repairing the P1104 Issue
Repairs must follow confirmed diagnosis based on the specific vehicle application.
If testing confirms a broken ground wire or corroded connector on a MAF sensor circuit, the wiring must be repaired or the connector replaced, and the sensor signal must be retested.
If a MAP sensor or wiring fault is confirmed, the failed sensor or damaged wires must be replaced, and the manifold pressure readings must be verified.
If a wastegate solenoid fault is confirmed, the failed solenoid or damaged wiring must be replaced, and boost pressure operation must be retested.
Cost Considerations for P1104 Repairs
Repair costs depend entirely on the confirmed root cause, component accessibility, and local labor rates.
Repairing a section of wiring or replacing a standalone solenoid may require minimal parts and labor. Conversely, replacing an integrated mass airflow sensor requires more diagnostic time and specific component costs.
Prevention Strategies for Future Occurrences
Some electrical or mechanical failures cannot be reliably prevented. However, inspecting exposed engine wiring harnesses for chafing, heat damage, or oil contamination can help prevent sensor and solenoid circuit shorts.
Ensuring that electrical connectors remain sealed and free of moisture intrusion helps reduce the likelihood of corrosion-related ground faults.
Troubleshooting Tips and Best Practices
Never assume P1104 is a universal MAP sensor code. Always verify the exact definition for the specific vehicle before purchasing parts or beginning electrical testing.
Do not ignore related codes. A MAF sensor ground fault frequently appears alongside other mass airflow circuit codes, while a wastegate solenoid fault may trigger additional boost pressure warnings.
Check for technical service bulletins applicable to your exact vehicle application, as manufacturers frequently release updated sensors or revised wiring harnesses for recurring circuit faults.
When evaluating the air-fuel mixture, remember that a faulty ground circuit can cause erratic sensor signals that severely impact fuel delivery.
This error code requires precise electrical testing rather than guesswork.
More OBD-II Codes
| P1101 | P1105 | P0100 | P0300 |
| P1102 | P1106 | P0101 | P0420 |
| P1103 | P1107 | P0171 | P0440 |
| P1032 | P1108 | P0174 | P0455 |
| P1002 | P1109 | P1690 | P1111 |
| P1001 | P1110 | P1662 | P1112 |
Frequently Asked Questions
Is P1104 a generic or manufacturer-specific code?
No. P1104 is a manufacturer-specific code. Its exact definition varies significantly between automakers, so the factory service information for the specific vehicle must be consulted.
Can I drive my car with a P1104 code?
It depends on the application. If P1104 indicates a MAF or MAP sensor fault, driving could cause rough running or stalling. If it indicates a wastegate fault, power may be reduced.
Will disconnecting the battery clear the P1104 code?
Disconnecting the battery may temporarily clear the code, but it does not repair the underlying electrical fault. The code will return once the module runs its self-test.
Can a vacuum leak cause a P1104 code?
On applications where P1104 indicates a MAP sensor fault, a severe vacuum leak can cause manifold pressure to drop unexpectedly, potentially triggering a low voltage or rationality fault code.
Does P1104 always mean the sensor is bad?
No. While a failed sensor can cause this code, damaged wiring, corroded connectors, poor electrical grounds, or blown fuses are frequent causes that must be ruled out first.
What Should You Do About the P1104 Code?
Confirm the exact factory definition and diagnostic procedure for your specific vehicle application. Because P1104 is manufacturer-specific, identifying whether it relates to the mass airflow sensor, manifold absolute pressure sensor, or turbocharger solenoid is the mandatory first step.
Follow the applicable manufacturer diagnostic steps to test the relevant system and components. Once the root cause is confirmed, complete the necessary repairs and verify that the system operates correctly and the code does not return.
