Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2016 Infiniti QX50 AWDFACTORY OEM SERVICE PROCEDURE
Engine Control System DTCS
ENGINE CONTROL SYSTEM (1 OF 3) DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC | Description |
|---|---|
| DTC P0011, P0021 | INTAKE VALVE TIMING CONTROL PERFORMANCE |
| DTC P0031, P0032, P0051, P0052 | AIR/FUEL RATIO SENSOR 1 HEATER CIRCUIT LOW/HIGH |
| DTC P0037, P0038, P0057, P0058 | HO2S2 HEATER CIRCUIT LOW/HIGH |
| DTC P0075, P0081 | INTAKE VALVE TIMING CONTROL SOLENOID VALVE CIRCUIT |
| DTC P0101, P010B | MASS AIR FLOW SENSOR CIRCUIT RANGE/PERFORMANCE |
| DTC P0102, P0103, P010C, P010D | MASS AIR FLOW SENSOR CIRCUIT LOW/HIGH INPUT |
| DTC P0111 | INTAKE AIR TEMPERATURE SENSOR CIRCUIT RANGE/PERFORMANCE |
| DTC P0112, P0113 | INTAKE AIR TEMPERATURE SENSOR CIRCUIT LOW/HIGH INPUT |
| DTC P0116 | ENGINE COOLANT TEMPERATURE SENSOR CIRCUIT RANGE/PERFORMANCE |
| DTC P0117, P0118 | ENGINE COOLANT TEMPERATURE SENSOR CIRCUIT LOW/HIGH INPUT |
| DTC P0122, P0123, P0227, P0228 | THROTTLE POSITION SENSOR CIRCUIT LOW/HIGH INPUT |
| DTC P0125 | ENGINE COOLANT TEMPERATURE SENSOR CLOSED LOOP COOLANT TEMP |
| DTC P0127 | INTAKE AIR TEMPERATURE SENSOR TEMP TOO HIGH |
| DTC P0128 | THERMOSTAT FUNCTION |
| DTC P0130, P0150 | AIR/FUEL RATIO SENSOR 1 CIRCUIT |
| DTC P0131, P0151 | AIR/FUEL RATIO SENSOR 1 CIRCUIT LOW VOLTAGE |
| DTC P0132, P0152 | AIR/FUEL RATIO SENSOR 1 CIRCUIT HIGH VOLTAGE |
| DTC P0137, P0157 | HO2S2 CIRCUIT LOW VOLTAGE |
| DTC P0138, P0158 | HO2S2 CIRCUIT HIGH VOLTAGE |
| DTC P0139, P0159 | HO2S2 CIRCUIT SLOW RESPONSE |
| DTC P014C, P014D, P014E, P014F, P015A, P015B, P015C, P015D | AIR/FUEL RATIO SENSOR 1 CIRCUIT SLOW/DELAYED RESPONSE |
| DTC P0171, P0174 | FUEL INJECTION SYSTEM TOO LEAN |
| DTC P0172, P0175 | FUEL INJECTION SYSTEM TOO RICH |
| DTC P0181 | FUEL TANK TEMPERATURE SENSOR CIRCUIT RANGE/PERFORMANCE |
| DTC P0182, P0183 | FUEL TANK TEMPERATURE SENSOR CIRCUIT LOW/HIGH INPUT |
| DTC P0196 | ENGINE OIL TEMPERATURE SENSOR RANGE/PERFORMANCE |
| DTC P0197, P0198 | ENGINE OIL TEMPERATURE SENSOR CIRCUIT LOW/HIGH INPUT |
| DTC P0222, P0223, P2132, P2133 | THROTTLE POSITION SENSOR CIRCUIT LOW/HIGH INPUT |
| DTC P0300, P0301, P0302, P0303, P0304, P0305, P0306 | CYLINDER MISFIRE |
| DTC P0327, P0328, P0332, P0333 | KNOCK SENSOR CIRCUIT LOW/HIGH INPUT |
| DTC P0335 | CRANKSHAFT POSITION SENSOR (POS) CIRCUIT |
| DTC P0340, P0345 | CAMSHAFT POSITION SENSOR (PHASE) CIRCUIT |
| DTC P0420, P0430 | THREE WAY CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD |
| DTC P0441 | EVAP CONTROL SYSTEM INCORRECT PURGE FLOW |
| DTC P0443 | EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE |
| DTC P0444, P0445 | EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE CIRCUIT OPEN/SHORTED |
ENGINE CONTROL SYSTEM (2 OF 3) DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC | Description |
|---|---|
| DTC P0447 | EVAP CANISTER VENT CONTROL VALVE CIRCUIT OPEN |
| DTC P0448 | EVAP CANISTER VENT CONTROL VALVE OPERATION |
| DTC P0451 | EVAP CONTROL SYSTEM PRESSURE SENSOR PERFORMANCE |
| DTC P0452 | EVAP CONTROL SYSTEM PRESSURE SENSOR LOW INPUT |
| DTC P0453 | EVAP CONTROL SYSTEM PRESSURE SENSOR HIGH INPUT |
| DTC P0456 | EVAP CONTROL SYSTEM VERY SMALL LEAK |
| DTC P0460 | FUEL LEVEL SENSOR CIRCUIT NOISE |
| DTC P0461 | FUEL LEVEL SENSOR CIRCUIT RANGE/PERFORMANCE |
| DTC P0462, P0463 | FUEL LEVEL SENSOR CIRCUIT LOW/HIGH INPUT |
| DTC P0500 | VEHICLE SPEED SENSOR CIRCUIT |
| DTC P0506 | IDLE SPEED CONTROL SYSTEM RPM LOWER THAN EXPECTED |
| DTC P0507 | IDLE SPEED CONTROL SYSTEM RPM HIGHER THAN EXPECTED |
| DTC P050A, P050B, P050E | COLD START CONTROL |
| DTC P0524 | ENGINE OIL PRESSURE TOO LOW |
| DTC P0550 | POWER STEERING PRESSURE SENSOR CIRCUIT |
| DTC P0603 | ECM POWER SUPPLY CIRCUIT |
| DTC P0605 | ECM MALFUNCTIONING |
| DTC P0607 | ECM CAN CONTROLLER |
| DTC P0643 | SENSOR POWER SUPPLY CIRCUIT SHORT |
| DTC P0850 | PARK/NEUTRAL POSITION SWITCH SIGNAL |
| DTC P100A, P100B | VVEL SYSTEM RESPONSE MALFUNCTION |
| DTC P1087, P1088 | VVEL SYSTEM SMALL EVENT ANGLE MALFUNCTION |
| DTC P1089, P1092 | VVEL CONTROL SHAFT POSITION SENSOR CIRCUIT |
| DTC P1090, P1093 | VVEL ACTUATOR MOTOR PERFORMANCE |
| DTC P1091 | VVEL ACTUATOR MOTOR RELAY CIRCUIT |
| DTC P1148, P1168 | CLOSED LOOP CONTROL FUNCTION |
| DTC P1211 | TRACTION CONTROL SYSTEM (TCS) CONTROL UNIT |
| DTC P1212 | TRACTION CONTROL SYSTEM (TCS) COMMUNICATION LINE |
| DTC P1217 | ENGINE OVER TEMPERATURE |
| DTC P1225, P1234 | THROTTLE POSITION SENSOR CLOSED POSITION LEARNING VALUE |
| DTC P1226, P1235 | THROTTLE POSITION SENSOR CLOSED POSITION LEARNING UNSUCCESSFUL |
| DTC P1233, P2101 | ELECTRIC THROTTLE CONTROL FUNCTION |
| DTC P1236, P2118 | THROTTLE CONTROL MOTOR CIRCUIT SHORT |
| DTC P1238, P2119 | ELECTRIC THROTTLE CONTROL ACTUATOR |
| DTC P1239, P2135 | THROTTLE POSITION SENSOR CIRCUIT RANGE/PERFORMANCE |
| DTC P1290, P2100, P2103 | THROTTLE CONTROL MOTOR RELAY CIRCUIT OPEN/SHORT |
| DTC P1550 | BATTERY CURRENT SENSOR CIRCUIT RANGE/PERFORMANCE |
| DTC P1551, P1552 | BATTERY CURRENT SENSOR CIRCUIT LOW/HIGH INPUT |
| DTC P1553 | BATTERY CURRENT SENSOR SIGNAL VOLTAGE HIGH |
| DTC P1554 | BATTERY CURRENT SENSOR SIGNAL VOLTAGE LOW |
| DTC P1564 | AUTOMATIC SPEED CONTROL DEVICE (ASCD) STEERING SWITCH |
| DTC P1564 | INTELLIGENT CRUISE CONTROL (ICC) STEERING SWITCH |
| DTC P1568 | INTELLIGENT CRUISE CONTROL (ICC) FUNCTION |
| DTC P1572 | AUTOMATIC SPEED CONTROL DEVICE (ASCD) BRAKE SWITCH |
| DTC P1572 | INTELLIGENT CRUISE CONTROL (ICC) BRAKE SWITCH |
| DTC P1574 | AUTOMATIC SPEED CONTROL DEVICE (ASCD) VEHICLE SPEED SENSOR |
| DTC P1574 | INTELLIGENT CRUISE CONTROL (ICC) VEHICLE SPEED SENSOR |
| DTC P1606 | VVEL CONTROL MODULE MALFUNCTION |
| DTC P1607 | VVEL CONTROL MODULE INTERNAL CIRCUIT MALFUNCTION |
| DTC P1608 | VVEL SENSOR POWER SUPPLY CIRCUIT |
| DTC P1805 | BRAKE SWITCH SIGNAL DELAYED |
| DTC P2096, P2097, P2098, P2099 | AIR/FUEL SENSOR 1 TOO LEAN/TOO RICH |
| DTC P2122, P2123 | ACCELERATOR PEDAL POSITION (APP) SENSOR 1 CIRCUIT LOW/HIGH INPUT |
| DTC P2127, P2128 | ACCELERATOR PEDAL POSITION (APP) SENSOR 2 CIRCUIT LOW/HIGH INPUT |
| DTC P2138 | ACCELERATOR PEDAL POSITION (APP) SENSOR CIRCUIT RANGE/PERFORMANCE |
ENGINE CONTROL SYSTEM (3 OF 3) DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC | Description |
|---|---|
| DTC P219A, P219B | AIR FUEL RATIO |
| DTC U0101 | CAN COMM CIRCUIT |
| DTC U1001 | CAN COMM CIRCUIT |
| DTC U1003 | CAN COMM CIRCUIT |
| DTC U1024 | CAN COMM CIRCUIT |
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.