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.
2006 Infiniti Q45FACTORY OEM SERVICE PROCEDURE
Engine Control System DTCS
ENGINE CONTROL SYSTEM DIAGNOSTIC TROUBLE CODES (DTC) IDENTIFICATION
| DTC | Description |
|---|---|
| U1000 | CAN COMM CIRCUIT |
| U1001 | CAN COMM CIRCUIT |
| U1010 | CONTROL UNIT(CAN) |
| P0011 | INT/V TIM CONT-B1 |
| P0021 | INT/V TIM CONT-B2 |
| P0031 | A/F SEN1 HTR (B1) |
| P0032 | A/F SEN1 HTR (B1) |
| P0037 | HO2S2 HTR (B1) |
| P0038 | HO2S2 HTR (B1) |
| P0051 | A/F SEN1 HTR (B2) |
| P0052 | A/F SEN1 HTR (B2) |
| P0057 | HO2S2 HTR (B2) |
| P0058 | HO2S2 HTR (B2) |
| P0075 | INT/V TIM V/CIR-B1 |
| P0081 | INT/V TIM V/CIR-B2 |
| P0101 | MAF SEN/CIRCUIT |
| P0102 | MAF SEN/CIRCUIT |
| P0103 | MAF SEN/CIRCUIT |
| P0112 | IAT SEN/CIRCUIT |
| P0113 | IAT SEN/CIRCUIT |
| P0117 | ECT SEN/CIRC |
| P0118 | ECT SEN/CIRC |
| P0122 | TP SEN2/CIRC |
| P0123 | TP SEN2/CIRC |
| P0125 | ECT SENSOR |
| P0127 | IAT SENSOR |
| P0128 | THERMSTAT FNCTN |
| P0130 | A/F SENSOR1 (B1) |
| P0131 | A/F SENSOR1 (B1) |
| P0132 | A/F SENSOR1 (B1) |
| P0133 | A/F SENSOR1 (B1) |
| P0137 | HO2S2 (B1) |
| P0138 | HO2S2 (B1) |
| P0139 | HO2S2 (B1) |
| P0150 | A/F SENSOR1 (B2) |
| P0151 | A/F SENSOR1 (B2) |
| P0152 | A/F SENSOR1 (B2) |
| P0153 | A/F SENSOR1 (B2) |
| P0157 | HO2S2 (B2) |
| P0158 | HO2S2 (B2) |
| P0159 | HO2S2 (B2) |
| P0171 | FUEL SYS-LEAN-B1 |
| P0172 | FUEL SYS-RICH-B1 |
| P0174 | FUEL SYS-LEAN-B2 |
| P0175 | FUEL SYS-RICH-B2 |
| P0181 | FTT SENSOR |
| P0182 | FTT SEN/CIRCUIT |
| P0183 | FTT SEN/CIRCUIT |
| P0222 | TP SEN 1/CIRC |
| P0223 | TP SEN 1/CIRC |
| P0300 | MULTI CYL MISFIRE |
| P0301 | CYL 1 MISFIRE |
| P0302 | CYL 2 MISFIRE |
| P0303 | CYL 3 MISFIRE |
| P0304 | CYL 4 MISFIRE |
| P0305 | CYL 5 MISFIRE |
| P0306 | CYL 6 MISFIRE |
| P0307 | CYL 7 MISFIRE |
| P0308 | CYL 8 MISFIRE |
| P0327 | KNOCK SEN/CIRC-B1 |
| P0328 | KNOCK SEN/CIRC-B1 |
| P0332 | KNOCK SEN/CIRC-B2 |
| P0333 | KNOCK SEN/CIRC-B2 |
| P0335 | CKP SEN/CIRCUIT |
| P0340 | CMP SEN/CIRC-B1 |
| P0420 | TW CATALYST SYS-B1 |
| P0430 | TW CATALYST SYS-B2 |
| P0441 | EVAP PURG FLOW/MON |
| P0442 | EVAP SMALL LEAK |
| P0443 | PURG VOLUME CONT/V |
| P0444 | PURG VOLUME CONT/V |
| P0445 | PURG VOLUME CONT/V |
| P0447 | VENT CONTROL VALVE |
| P0448 | VENT CONTROL VALVE |
| P0452 | EVAP SYS PRES SEN |
| P0453 | EVAP SYS PRES SEN |
| P0455 | EVAP GROSS LEAK |
| P0456 | EVAP VERY SML LEAK |
| P0460 | FUEL LEV SEN SLOSH |
| P0461 | FUEL LEVEL SENSOR |
| P0462 | FUEL LEVL SEN/CIRC |
| P0463 | FUEL LEVL SEN/CIRC |
| P0500 | VEH SPEED SEN/CIRC |
| P0506 | ISC SYSTEM |
| P0507 | ISC SYSTEM |
| P0550 | PW ST P SEN/CIRC |
| P0603 | ECM BACK UP/CIRCUIT |
| P0605 | ECM |
| P0643 | SENSOR POWER/CIRC |
| P0700 | TCM |
| P0705 | PNP SW/CIRC |
| P0710 | ATF TEMP SEN/CIRC |
| P0717 | TURBINE SENSOR |
| P0720 | VEH SPD SEN/CIR AT |
| P0740 | TCC SOLENOID/CIRC |
| P0744 | A/T TCC S/V FNCTN |
| P0745 | L/PRESS SOL/CIRC |
| P0850 | P-N POS SW/CIRCUIT |
| P1140 | INTK TIM S/CIRC-B1 |
| P1145 | INTK TIM S/CIRC-B2 |
| P1148 | CLOSED LOOP-B1 |
| P1168 | CLOSED LOOP-B2 |
| P1211 | TCS C/U FUNCTN |
| P1212 | TCS/CIRC |
| P1217 | ENG OVER TEMP |
| P1220 | FPCM/CIRCUIT |
| P1225 | CTP LEARNING |
| P1226 | CTP LEARNING |
| P1442 | EVAP SMALL LEAK |
| P1456 | EVAP VERY SML LEAK |
| P1490 | VC/V BYPASS/V |
| P1491 | VC CUT/V BYPASS/V |
| P1564 (Models with ICC) or DTC P1564 ASCD STEERING SWITCH (Models with ASCD) | ASCD SW |
| P1568 | ACC COMMAND VALUE |
| P1572 (Models with ICC) or P1572 (Models with ASCD) | ASCD BRAKE SW |
| P1574 (Models with ICC) or P1574 (Models with ASCD) | ASCD VHL SPD SEN |
| P1610 - P1615 | IVIS (INFINITI VEHICLE IMMOBILIZER SYSTEM-NATS) |
| P1715 | IN PULY SPEED |
| P1730 | A/T INTERLOCK |
| P1752 | I/C SOLENOID/CIRC |
| P1754 | I/C SOLENOID FNCTN |
| P1757 | FR/B SOLENOID/CIRC |
| P1759 | FR/B SOLENOID FNCT |
| P1762 | D/C SOLENOID/CIRC |
| P1764 | D/C SOLENOID FNCTN |
| P1767 | HLR/C SOL/CIRC |
| P1769 | HLR/C SOL FNCTN |
| P1772 | LC/B SOLENOID/CIRC |
| P1774 | LC/B SOLENOID FNCT |
| P1800 | VIAS S/V CIRC |
| P1805 | BRAKE SW/CIRCUIT |
| P2100 | ETC MOT PWR |
| P2101 | ETC FUNCTION/CIRC |
| P2103 | ETC MOT PWR |
| P2118 | ETC MOT |
| P2119 | ETC ACTR |
| P2122 | APP SEN 1/CIRC |
| P2123 | APP SEN 1/CIRC |
| P2127 | APP SEN 2/CIRC |
| P2128 | APP SEN 2/CIRC |
| P2135 | TP SENSOR |
| P2138 | APP SENSOR |
| P2A00 | A/F SENSOR1 (B1) |
| P2A03 | A/F SENSOR1 (B2) |
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.
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