Acura OBD/OBD2 Codes >> RL 3.5/3.7L – MDX 3.7L (2005 – 2009)

ModelYearEngine identificationSystem
RL  3.5L2005-08J35A8PGM-FI
RL  3.7L2009J37A2PGM-FI
MDX 3.7L2007-09J37A1PGM-FI

General information

  • Malfunction indicator lamp (MIL) will illuminate if certain faults are recorded.
  • ECM operates in backup mode if sensors fail, to enable vehicle to be driven to repair shop.

Accessing

  • Trouble codes can only be displayed by using a Scan Tool connected to the data link connector (DLC) [1].

Erasing

  • Trouble codes can only be erased by using a Scan Tool connected to the data link connector (DLC) [1].

Trouble code  identification

OBD·II codeFault locationProbable cause
PO, P2,UORefer to OBD-11 trouble code tables–
P1077Intake manifold air control system -·high RPM   malfunctionWiring, intake manifold air control solenoid, ECM programming, ECM
P1078Intake manifold air control system – low RPM   malfunctionWiring, intake manifold air control solenoid, ECM programming, ECM
P1109Barometric pressure (BA O) sensor- range/performance problemBARO sensor, ECM programming, ECM
P1116Engine coolant temperature (ECT) sensor – range/performance problemWiring, ECT sensor, ECM programming, ECM
P1128Manifold absolute pressure (MAP) sensor – pressure lower than expectedMAP sensor
P1129Manifold absolute pressure (MAP) sensor – pressure higher than expectedMAP sensor
P1157Heated oxygen sensor (H02S) – circuit malfunctionWiring, H02S, ECM programming, ECM
P1172Heated oxygen sensor (H02S)- H02S 1, bank 1 – circuit malfunctionWiring, H02S, ECM programming, ECM
P1174Heated oxygen sensor (H02S) – H02S 1, bank 2 – circuit malfunctionWiring, H02S, ECM programming, ECM
P1297Electrical load sensor – circuit/voltage lowWiring, underhood fuseboxlrelay plate, electrical load sensor, ECM programming, ECM
P1298Electrical load sensor – circuit/voltage highWiring, underhood fuseboxlrelay plate, electrical load sensor, ECM programming, ECM
P145CEvaporative emission (EVAP) canister purge system – incorrect flowWiring, hose leak/blockage, EVAP canister purge valve, mechanical fault, ECM programming, ECM
P1454Fuel tank pressure sensor – range/performance problemWiring, hose, fuel tank pressure sensor, fuel filler cap, EVAP canister/vent valve, ECM programming, ECM
P1549Generator system – high voltageWiring, generator, ECM programming, ECM
P16BBGenerator system – low voltageWiring, generator, ECM programming, ECM
P16BCGenerator system – low voltageWiring, generator, ECM programming, ECM
P16BDStarter motor relay 2 – malfunctionWiring, starter motor relay, ECM   programming, ECM
P16BEStarter motor relay 1 – malfunctionWiring, starter motor relay, ECM   programming, ECM
P16BFStarter motor relays 1/2- circuit malfunctionWiring, ECM programming, ECM
P16COEngine control module (ECM) – malfunctionECM programming, ECM
P1658Electronic throttle system (ETS) relay – malfunc.tionWiring, ETS relay, ECM programming, ECM
P1659Electronic throttle system (ETS) relay- malfunctionWiring, ETS relay, ECM programming, ECM
P1683Throttle motor – default position spring performance problemWiring, throttle sticking/mechanically damaged, throttle motor
P1684Throttle motor – return spring performance problemWiring, throttle sticking/mechanically damaged, throttle motor
P1717Transmission range (TR) switch – open circuitWiring, transmission shift link adjustment, TR switch, ECM programming, ECM
P1730AT- gear shift malfunctionTransmission fluid, mechanical fault, wiring, shift solenoid A/B/0, ECM programming, ECM
P1731AT- gear shift malfunctionTransmission fluid, mechanical fault, wiring, shift solenoid E, AT clutch pressure control solenoid A, ECM programming, ECM
P1732AT – gear shift malfunctionTransmission fluid, mechanical fault, wiring, shift solenoid B/C, ECM programming, ECM
P1733AT- gear shift malfunctionTransmission fluid, mechanical fault, wiring, shift solenoid 0, AT clutch pressure control solenoid C, ECM programming, ECM
P1734AT- gear shift malfunctionTransmission fluid, mechanical fault, wiring, shift solenoid B/C, ECM programming, ECM
P1743AT – gear shift malfunctionTransmission fluid, wiring, shift solenoid E, mechanical fault, ECM programming, ECM
P1744AT – gear shift malfunctionTransmission fluid, wiring, shift solenoid E, mechanical fault, ECM programming, ECM
P1745AT- gear shift malfunctionTransmission fluid, mechanical fault
P1780AT- gear shift malfunctionOther AT trouble codes stored, ECM programming, ECM