Mitsubishi vehicles use an onboard diagnostic system to monitor performance and store trouble codes when issues arise. These OBD-II codes help identify problems ranging from engine misfires to transmission and emissions system faults.
Understanding the difference between generic SAE codes and manufacturer-specific Mitsubishi codes is essential for accurate diagnosis. Proper troubleshooting ensures repairs meet factory standards and restore optimal vehicle operation.
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Key Takeaways
- Mitsubishi OBD-II codes include both generic SAE definitions and manufacturer-specific fault identifiers.
- Reading codes requires an OBD-II scanner connected to the diagnostic port under the dashboard.
- Common issues involve mass airflow sensors, oxygen sensor circuits, and ignition system misfires.
- Accurate diagnosis requires verifying the exact factory definition and testing the relevant circuits.
Mitsubishi OBD-II Code Description and Implications
Mitsubishi OBD-II codes are alphanumeric identifiers stored by the powertrain control module when a monitored system falls outside expected parameters.
Generic codes (P0xxx) apply across all vehicle makes and cover universal systems like fuel metering and emissions.
Manufacturer-specific codes (P1xxx) are unique to Mitsubishi and related platforms, requiring specialized diagnostic knowledge to interpret specific actuators or sensors.
Common Causes of Mitsubishi OBD-II Codes
Because Mitsubishi vehicles feature complex engine management systems, the causes of trouble codes vary widely depending on the specific fault.
Possible causes include failing sensors, degraded wiring, or vacuum leaks affecting fuel trim and engine performance.
Boost control issues, such as failing turbocharger wastegate solenoids or boost sensors, frequently trigger specific monitoring codes on equipped models.
Symptoms Associated With Mitsubishi OBD-II Codes
Symptoms depend entirely on the specific system generating the fault code.
Drivers may experience an illuminated Check Engine Light, rough idling, or reduced fuel economy.
Some sensor or solenoid faults may present as engine hesitation, stalling, or poor drivability under load.
Other emission-related codes may produce no noticeable drivability symptoms other than the warning indicator.
Diagnosing Mitsubishi OBD-II Trouble Codes
Diagnosis must begin by retrieving the exact codes using a scan tool capable of reading both generic and manufacturer-specific data.
Record freeze-frame data to understand the engine conditions when the fault occurred.
Inspect relevant wiring, sensors, and grounds for physical damage or corrosion.
Perform targeted electrical or mechanical tests according to the specific Mitsubishi service information for the retrieved code.
Repairing Mitsubishi OBD-II Issues
Repairs must follow the confirmed root cause identified during system-specific testing.
If a sensor or actuator is confirmed faulty through live data and circuit testing, replace the component with one meeting the correct vehicle specification.
If a wiring harness or connector is confirmed damaged, repair or replace the affected circuit.
Clear the codes and verify the repair by completing the appropriate OBD-II drive cycle monitors.
Cost Considerations for Mitsubishi OBD-II Repairs
Repair costs for Mitsubishi OBD-II codes vary widely based on the underlying fault, component accessibility, and local labor rates.
Replacing a sensor or repairing a vacuum leak involves minimal parts costs.
Replacing internal engine components, catalytic converters, or control modules involves significant parts and labor expenses.
Cost depends on diagnostic time, required parts, programming requirements, and labor.
Prevention Strategies for Future Occurrences
Performing regular maintenance, including air filter and fuel filter replacements, helps prevent fuel and air metering faults.
Keeping electrical connectors clean and secure reduces the likelihood of intermittent sensor circuit codes.
Troubleshooting Tips and Best Practices
Do not assume a manufacturer-specific code requires replacing the powertrain control module immediately; sensor or wiring faults are highly likely culprits.
Always check for applicable technical service bulletins, as Mitsubishi occasionally releases software updates or revised components to address chronic fault codes.
Use a high-quality scan tool capable of accessing specific modules beyond the standard powertrain control module.
The following table outlines frequent trouble codes encountered on Mitsubishi applications. Always verify the exact factory definition for your specific model and engine configuration.
| Code | Description |
|---|---|
| P1103 | Turbocharger Wastegate Actuator |
| P1104 | Turbocharger Wastegate Solenoid |
| P1105 | Fuel Pressure Solenoid |
| P1300 | Ignition Timing Adjustment circuit |
| P1400 | Manifold Differential Pressure Sensor circuit |
| P1500 | Alternator FR Terminal circuit |
| P1600 | Serial Communication Link |
| P1715 | Pulse Generator Assembly |
| P1750 | Solenoid Assembly |
| P1751 | A/T Control Relay |
| P1791 | Engine Coolant Temperature Level Input circuit |
| P1795 | Throttle Position Input circuit to TCM |
| P0115 | Engine Coolant Temperature circuit |
| P0120 | Throttle Position circuit |
| P0125 | Excessive Time to Enter Closed Loop Fuel Control |
| P0130 | Heated Oxygen Sensor circuit Bank 1 Sensor 1 |
| P0135 | Heated Oxygen Sensor Heater circuit Bank 1 Sensor 1 |
| P0136 | Heated Oxygen Sensor circuit Bank 1 Sensor 2 |
| P0141 | Heated Oxygen Sensor Heater circuit Bank 1 Sensor 2 |
| P0150 | Heated Oxygen Sensor circuit Bank 2 Sensor 1 |
| P0155 | Heated Oxygen Sensor Heater circuit Bank 2 Sensor 1 |
| P0156 | Heated Oxygen Sensor circuit Bank 2 Sensor 2 |
| P0161 | Heated Oxygen Sensor Heater circuit Bank 2 Sensor 2 |
| P0170 | Fuel Trim Bank 1 |
| P0173 | Fuel Trim Bank 2 |
| P0300 | Random Misfire Detected |
| P0301 | Misfire Detected – Cylinder 1 |
| P0302 | Misfire Detected – Cylinder 2 |
| P0303 | Misfire Detected – Cylinder 3 |
| P0304 | Misfire Detected – Cylinder 4 |
| P0305 | Misfire Detected – Cylinder 5 |
| P0306 | Misfire Detected – Cylinder 6 |
| P0325 | Knock Sensor 1 circuit |
| P0335 | Crankshaft Position Sensor circuit |
| P0340 | Camshaft Position Sensor circuit |
| P0400 | EGR Flow |
| P0403 | EGR Solenoid |
| P0139 | Heated oxygen sensor (rear) circuit. Slow response |
| P0140 | Heated oxygen sensor (rear) circuit. No activity detected |
| P0219 | Engine over speed condition |
| P0214 | Cold Start Injector 2 Malfunction |
| P0215 | Engine Shutoff Solenoid Malfunction |
| P0216 | Injection Timing Control Circuit Malfunction |
| P0217 | Engine Overtemp Condition |
| P0218 | Transmission Over Temperature Condition |
| P0220 | Throttle/Pedal Position Sensor/Switch B Circuit Malfunction |
| P0234 | Engine Overboost Condition |
| P0235 | Turbocharger Boost Sensor A Circuit Malfunction |
| P0236 | Turbocharger Boost Sensor A Circuit Range/Performance |
| P0237 | Turbocharger Boost Sensor A Circuit Low |
| P0238 | Turbocharger Boost Sensor A Circuit High |
| P0239 | Turbocharger Boost Sensor B Malfunction |
More OBD-II Codes
| P1088 | P1090 | P1092 | P1094 |
| P1096 | P1098 | P1106 | P1107 |
| P1118 | P1119 | P1121 | P1122 |
| P0131 | P0132 | P0133 | P0300 |
| P0420 | P0430 | P0171 | P0174 |
| P0101 | P0121 | P0112 | P0113 |
Frequently Asked Questions
Are Mitsubishi OBD2 codes different from generic codes?
Yes. Mitsubishi uses both generic SAE codes and manufacturer-specific codes. The manufacturer-specific codes require specialized diagnostic definitions and procedures.
Can I read Mitsubishi codes with a basic OBD2 scanner?
A basic scanner reads generic powertrain codes. However, accessing manufacturer-specific codes and advanced module data requires a scanner with appropriate software coverage.
Will a Mitsubishi OBD2 code clear itself?
Not automatically. While an intermittent fault may stop triggering the monitor, stored and permanent codes usually require a scan tool to clear before monitors can reset.
Is it safe to drive with a Check Engine Light on?
Driving is conditional. A solid light may indicate an emissions or sensor issue, but a flashing light indicates a severe misfire that can rapidly damage the catalytic converter.
Do Mitsubishi OBD2 codes prove a specific part has failed?
No. A code identifies a detected condition or circuit fault. Testing is required to confirm whether the sensor, wiring, or control module is the actual root cause.
What Should You Do About Mitsubishi OBD-II Codes?
Confirm the exact factory definition and wiring diagrams for your specific Mitsubishi model and engine configuration.
Follow the applicable manufacturer diagnostic procedure to test the relevant sensors, circuits, and mechanical components.
Repair or replace the confirmed failed component, then retest the system to ensure all monitors complete successfully.
