OBDII Acura Code Definitions.

Be sure to double check the codes. Anything P1000 to P1999 or P3000 to P3400 will be Manufacturer specific and may not match the ones listed here. Check specific manufacturer pages on the site, as some of them, we list the OBD2 codes on those pages for those specific vehicles.

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Acura Codes
Trouble Code Fault Location Probable Cause
P1009Variable Valve Timing Control Advance MalfunctionWiring, valve timing, engine mechanical fault, CMP actuator, ECM
P1020Valve Pause System Stuck Off
P1021Valve Pause System Stuck On
P1024Valve Pause System Sticking On
P1077Intake Manifold Runner Control System Malfunction Low RPMWiring, intake manifold air control solenoid, ECM programming, ECM
P1078Intake Manifold Runner Control System Malfunction High RPMWiring, intake manifold air control solenoid, ECM programming, ECM
P1102Mass air flow (MAF) sensor - signal higher than expectedMAF sensor
P1103Mass air flow (MAF) sensor - signal higher than expectedMAF sensor
P1106Barometric Pressure Sensor Range/Performance ProblemECM
P1107Barometric Pressure Sensor Circuit Low VoltageWiring, TCM, ECM
P1108Barometric Pressure Sensor Circuit High VoltageECM
P1109BARO Sensor Circuit Out of Range HighBARO sensor, ECM programming, ECM
P1111Intake air temperature (IAT) sensor - circuit/ intermittent voltage highWiring, IAT sensor
P1112Intake air temperature (IAT) sensor - circuit/ intermittent voltage lowWiring, IAT sensor
P1114Engine coolant temperature (ECT) sensor - circuit/ intermittent voltage lowWiring, ECT sensor
P1115Engine coolant temperature (ECT) sensor - circuit/ intermittent voltage highWiring, ECT sensor
P1116Engine Coolant Temperature Sensor Performance ProblemWiring, ECT sensor, ECM programming, ECM
P1121Throttle position (TP) sensor - circuit/ intermittent voltage highWiring, TP sensor
P1122Throttle position (TP) sensor - circuit/ intermittent voltage lowWiring, TP sensor
P1128Manifold absolute pressure (MAP) sensor - pressure lower than expectedMAP sensor
P1129Manifold absolute pressure (MAP) sensor - pressure higher than expectedMAP sensor
P1131Brake system vacuum sensor – signal malfunctionWiring, other trouble codes stored, brake system vacuum sensor, brake servo vacuum pump, ECM programming, ECM
P1133Heated oxygen sensor (HO2S) - RH front - insufficient switchingExhaust system, wiring, HO2S, ECM
P1134Heated oxygen sensor (HO2S) - RH front - slow operationExhaust system, wiring, HO2S, ECM
P1149Air/Fuel Ratio Sensor 1 Circuit Range/Performance
P1153Heated oxygen sensor (HO2S) - LH front - insufficient switchingExhaust system, wiring, HO2S, ECM
P1154Heated oxygen sensor (HO2S) - LH front - slow operationExhaust system, wiring, HO2S, ECM
P1157Air/Fuel Ratio Sensor 1 Range/Performance ProblemWiring, H02S, ECM programming, ECM
P1158Air/Fuel Ratio Sensor 1 Terminal Low Voltage
P1159Air/Fuel Ratio Sensor 1 AFS+ Terminal Low Voltage
P1162Air fuel (A/F) sensor - RSX 1 - circuit malfunctionWiring, A/F sensor, ECM
P1163Air fuel (A/F) sensor - RSX 1 - slow responseA/F sensor
P1164Air fuel (A/F) sensor - RSX 1 - range/ performance problemWiring, A/F sensor, ECM
P1165Air/Fuel Ratio Sensor 1 Circuit Range/Performance
P1166Air fuel (A/F) sensor - RSX 1 - heater circuit malfunctionWiring, A/F sensor, ECM
P1167Air fuel (A/F) sensor - RSX 1 - heater system malfunctionWiring, A/F sensor, ECM
P1168Air/Fuel Ratio Sensor Label Low Voltage
P1169Air/Fuel Ratio Sensor 1 LABEL High Voltage
P1171Fuel system - mixture lean under accelerationFuel pump/strainer, incorrect fuel
P1172Rear A/F Sensor Bank 1 Sensor 1 Circuit Out Of Range HighWiring, H02S, ECM programming, ECM
P1174AF Sensor 21 Circuit Out Of Range HighWiring, H02S, ECM programming, ECM
P1187Fuel Tank Temperature Sensor Circuit Low Voltage
P1188Fuel Tank Temperature Sensor Circuit High Voltage
P1192Fuel Tank Pressure Sensor Circuit Low Voltage
P1193Fuel Tank Pressure Sensor Circuit High Voltage
P1201Cylinder No. 1 - misfireWiring, injector, ignition system, mechanical fault
P1202Cylinder No. 2 - misfireWiring, injector, ignition system, mechanical fault
P1203Cylinder No. 3 - misfireWiring, injector, ignition system, mechanical fault
P1204Cylinder No. 4 - misfireWiring, injector, ignition system, mechanical fault
P1205Cylinder No. 5 - misfireWiring, injector, ignition system, mechanical fault
P1206Cylinder No. 6 - misfireWiring, injector, ignition system, mechanical fault
P1233Turbocharger (TC) boost pressure sensor/barometric pressure (BARO) sensor- signal correlationWiring, TC boost pressure sensor, BARO sensor, ECM programming, ECM
P1234Turbocharger (TC) boost pressure sensor/manifold absolute pressure (MAP) sensor – signal correlationWiring, TC boost pressure sensor, MAP sensor, ECM programming, ECM
P1241Throttle actuator control (TAC) motor - circuit 1 - malfunctionWiring, TAC motor, ECM
P1242Throttle actuator control (TAC) motor - circuit 2 - malfunctionWiring, TAC motor, ECM
P1243Throttle position (TP) - insufficientThrottle valve, TP sensor, TAC motor
P1244Closed throttle position (CTP) - insufficientThrottle valve, TP sensor
P1246Accelerator pedal position (APP) sensor 1 - circuit malfunctionWiring, APP sensor, ECM
P1247Accelerator pedal position (APP) sensor 2 - circuit malfunctionWiring, APP sensor, ECM
P1248Accelerator pedal position (APP) sensor 1 & 2 - incorrect signalsAPP sensor
P1253VTEC system malfunctionWiring, VTEC solenoid, ECM
P1257VTEC System Malfunction
P1258VTEC System Malfunction
P1259Camshaft position (CMP) actuator - circuit malfunctionWiring, CMP actuator, ECM
P1271Accelerator Pedal Position Sensor 1-2 Correlation
P1272Accelerator Pedal Position Sensor 2-3 Correlation
P1273Accelerator Pedal Position Sensor 1-3 Correlation
P1275Accelerator Pedal Position Sensor 1 Circuit
P1279VTEC control system malfunction - front bankWiring, VTEC solenoid/pressure switch, ECM
P1280Accelerator Pedal Position (APP) Sensor 2 Circuit Malfunction
P1286Engine Oil Pressure Sensor Stuck Low
P1287Rocker Arm Oil Pressure Switch Circuit High Voltage
P1288Rocker Arm Oil Pressure Switch Circuit Low Voltage
P1289Engine Oil Pressure Sensor Stuck High
P1295Electronic Throttle Control Power Management Mode
P1297Electrical load control module - voltage lowWiring, electrical load control module
P1298Electrical load control module - voltage highWiring, electrical load control module
P1299Electronic Throttle Control Forced Engine Shut Down Mode
P1300 – P1399 (Ignition system or misfire)
P1300Random misfireEGR/fuel/ignition system, MAP sensor
P1301Cylinder No. 1 - misfireIgnition system
P1302Cylinder No. 2 - misfireIgnition system
P1303Cylinder No. 3 - misfireIgnition system
P1304Cylinder No. 4 - misfireIgnition system
P1305Cylinder No. 5 - misfireIgnition system
P1306Cylinder No. 6 - misfireIgnition system
P1316Spark plug voltage detection - LH bank - circuit malfunctionWiring, voltage detection module, ECM
P1317Spark plug voltage detection - RH bank - circuit malfunctionWiring, voltage detection module, ECM
P1318Spark plug voltage detection module reset - LH bank - reset circuit malfunctionWiring, voltage detection module, ECM
P1319Spark plug voltage detection module reset - RH bank - reset circuit malfunctionWiring, voltage detection module, ECM
P1324Knock Sensor Power Source Circuit Low Voltage
P1326Ignition Control Module Combustion Quality Input Signal
P1336Crankshaft position (CKP) range/performance problemCKP sensor, valve timing
P1337Crankshaft position (CKP) circuit malfunctionWiring, CKP sensor, ECM
P1359Crankshaft position (CKP) sensor - connector disconnectionWiring
P1361Camshaft position (CMP) intermittentWiring, CMP sensor
P1362Camshaft position (CMP) no signalWiring, CMP sensor
P1366Camshaft position (CMP) intermittentWiring, CMP sensor
P1367Camshaft position (CMP) no signalWiring, CMP sensor
P1381Camshaft position (CMP) range/ performance problemCMP sensor
P1382Camshaft position (CMP) malfunctionWiring, CMP sensor, ECM
P1386Camshaft position (CMP) range/ performance problemCMP sensor
P1387Camshaft position (CMP) malfunctionWiring, CMP sensor, ECM
P1390G-sensor - intermittent voltage lowWiring, G-sensor
P1391G-sensor - performance problemSeal damaged/missing, incorrectly installed, wiring, G-sensor, ECM
P1392G-sensor - voltage lowWiring, G-sensor, ECM
P1393G-sensor - voltage highWiring, G-sensor, ECM
P1394G-sensor - intermittent voltage highWiring, G-sensor
P1399Random misfireFuel/ignition system, MAP sensor, IAC valve
P1404EGR Valve Stuck Closed
P1406Exhaust gas recirculation (EGR) valve position sensor - circuit problemWiring, EGR valve/position sensor, ECM
P1410Secondary air injection (AIR) system - malfunctionAIR pump
P1413Secondary Air Injection System Control Solenoid Circuit High Voltage
P1415AIR pump electrical current sensor - open/ short circuitWiring, AIR pump electrical current sensor, ECM
P1416AIR pump electrical current sensor - open circuitWiring, AIR pump electrical current sensor, ECM
P1420NOx Adsorptive Catalyst System Efficiency Below Threshold
P1441Evaporative emission (EVAP) canister purge system - flow detectedWiring, EVAP solenoid, vacuum switch, ECM
P1442Evaporative emission (EVAP) canister purge system - vacuum switch malfunctionWiring, vacuum switch, ECM
P1450Two Way Valve Bypass Valve Control Circuit Low Voltage
P1451Two Way Valve Bypass Valve Control Circuit High Voltage
P1454Fuel Tank Pressure Sensor Range/Performance ProblemWiring, hose, fuel tank pressure sensor, fuel filler cap, EVAP canister/vent valve, ECM programming, ECM
P1456Evaporative emission (EVAP) canister purge system (fuel tank system) - leak detectedHose leak/blockage, fuel tank/pressure sensor, EVAP valve/bypass solenoid, EVAP two way valve, EVAP canister/ vent valve
P1457Evaporative emission (EVAP) canister purge system (canister system) - leak detectedHose leak/blockage, fuel tank/ pressure sensor, EVAP valve/bypass solenoid, EVAP two way valve, EVAP canister/ vent valve
P1459Evaporative emission (EVAP) canister purge system - switch malfunctionWiring, flow switch, hose leak/blockage, ECM
P145AEvaporative emission (EVAP) canister purge system – incorrect flowWiring, hose leak/blockage, EVAP canister purge valve, non-return valve B, ECM programming, ECM
P145BEvaporative emission (EVAP) canister purge system – non-return valve stuck openNon-return valve A
P145CEvaporative emission (EVAP) canister purge system – incorrect flowWiring, hose leak/blockage, EVAP canister purge valve, mechanical fault, ECM programming, ECM
P145DEvaporative emission (EVAP) canister purge system – incorrect flowWiring, hose leak/blockage, EVAP canister purge valve, non-return valve B, ECM programming, ECM
P1460Fuel Level Sensor Power Supply Circuit
P1486Thermostat - range/performance problemEngine coolant blower motor, cooling system
P1491Exhaust gas recirculation (EGR) system - valve lift insufficientWiring, EGR valve/position sensor, EGR solenoid, hose leak/blockage, ECM
P1498Exhaust gas recirculation (EGR) valve position sensor - voltage highWiring, EGR valve/lift sensor, ECM
P1505Positive Crankcase Ventilation Air Leakage
P1508Idle air control (IAC) system - low RPMIntake system, throttle body, hose leak, wiring, IAC valve, ECM
P1509Idle air control (IAC) system - high RPMHose leak, throttle body, crankcase vent valve, wiring, IAC valve, ECM
P1514Throttle Position Sensor / Mass Air Flow Sensor Signal Variation
P1516Throttle Actuator Control Position Performance
P1519Idle air control (IAC) valve - circuit failureWiring, IAC valve, ECM
P1522Brake Booster Pressure Sensor Circuit Low Voltage
P1523Brake Booster Pressure Sensor Circuit High Voltage
P1541Passenger Compartment Heater Standby Signal Circuit Low Input
P1549Charging System High Voltage Wiring, generator, ECM programming, ECM
P1571Brake Switch Circuit Malfunction
P1589Brake booster pressure sensor – signal malfunctionWiring, vacuum pipes blocked/leaking, air leaks, brake booster pressure sensor, intake manifold check valve, ECM programming, ECM
P15BABrake booster pressure sensor – no vacuum
P15BBBrake booster pressure sensor -leak detectedVacuum pipes blocked/leaking, brake booster vacuum pump, brake booster pressure sensor, brake booster, brake pedal position (BPP) switch
P15BCBrake booster vacuum pump – stuck ONWiring, brake booster pressure sensor, vacuum pipes leaking, brake booster vacuum pump, intake manifold check valve
P1607Engine control module (ECM) - internal circuit failureECM
P1608Engine control module (ECM) - internal circuit failure BECM
P1618Engine control module (ECM) - internal faultECM
P1625Engine Control Module Unexpected Reset
P1640Engine control module (ECM) - internal faultWiring, ECM
P1646Sensor Supply Voltage Circuit 'C' Malfunction
P1650Engine Control Module Quad Driver / Output Driver
P1655AT - signal failureCommunication wire, ECM
P1656Electronic stability programme (ESP) control module - communication malfunctionWiring, ESP control module
P1658Electronic Throttle Control System Control Relay ON MalfunctionWiring, ETS relay, ECM programming, ECM
P1659Electronic Throttle Control System Control Relay OFF MalfunctionWiring, ETS relay, ECM programming, ECM
P1660AT to ECM - signal failureWiring, TCM, ECM
P1671AT to ECM signal - no signalWiring, TCM, ECM
P1672AT to ECM signal - signal failureWiring, TCM, ECM
P1676ABS/TCS control module - communication malfunctionWiring, ABS/TCS control module, ECM
P1677ECM to traction control system signal - signal failureWiring, traction control module, ECM
P1678ABS/TCS control module - communication malfunctionWiring, ABS/TCS control module, ECM
P1681AT to ECM - signal A - input lowWiring, TCM, ECM
P1682AT to ECM - signal A - input highWiring, TCM, ECM
P1683Throttle Valve Default Position Spring Performance ProblemWiring, throttle sticking/mechanically damaged, throttle motor
P1684Throttle Valve Return Spring Performance ProblemWiring, throttle sticking/mechanically damaged, throttle motor
P1686AT to ECM - signal B - input lowWiring, TCM, ECM
P1687AT to ECM - signal B - input highWiring, TCM, ECM
P1690Traction control system - circuit failureWiring, traction control module, ECM
P1696Traction control system - voltage lowWiring, traction control module, ECM
P1697Traction control system - voltage highWiring, traction control module, 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
P16C0Engine control module (ECM) – malfunctionECM programming, ECM
P16D9Engine control module (ECM) – internal circuit failureECM programming, ECM
P16DABrake booster vacuum pump relay 1 – stuck OFFWiring, brake booster vacuum pump relay, ECM programming, ECM
P16DBBrake booster vacuum pump relay 1/2- circuit malfunctionWiring, brake booster vacuum pump relay, ECM programming, ECM
P16DCBrake booster vacuum pump relay 2 – stuck ONWiring, brake booster vacuum pump relay, ECM programming, ECM
P16DDBrake booster vacuum pump relay 1 – stuck ONWiring, brake booster vacuum pump relay, ECM programming, ECM
P1705AT - gear shift malfunctionWiring, range position switch, ECM
P1706AT - gear shift malfunctionWiring, range position switch, ECM
P1709AT - range position switchWiring, range position switch, ECM
P1710AT - 1st gear hold switchWiring, range position switch, ECM
P1717Transmission Range Switch Switch Circuit OpenWiring, transmission shift link adjustment, TR switch, ECM programming, ECM
P1730Problem In Shift Control SystemTransmission fluid, mechanical fault, wiring, shift solenoid A/B/0, ECM programming, ECM
P1731Problem In Shift Control SystemTransmission fluid, mechanical fault, wiring, shift solenoid E, AT clutch pressure control solenoid A, ECM programming, ECM
P1732Problem In Shift Control SystemTransmission fluid, mechanical fault, wiring, shift solenoid B/C, ECM programming, ECM
P1733Problem In Shift Control SystemTransmission fluid, mechanical fault, wiring, shift solenoid 0, AT clutch pressure control solenoid C, ECM programming, ECM
P1734Problem In Shift Control SystemTransmission fluid, mechanical fault, wiring, shift solenoid B/C, ECM programming, ECM
P1738Automatic transmissionWiring, clutch pressure switch 2, ECM
P1739AT - 3rd clutch pressure switchWiring, range position switch, ECM
P1740AT - 4th clutch pressure switchWiring, range position switch, 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
P1750AT - hydraulic system mechanical malfunctionWiring, range position switch, ECM
P1751AT - hydraulic system mechanical malfunctionWiring, range position switch, ECM
P1753AT - lock-up clutch not engaging/ disengagingWiring, lock-up control solenoid A, ECM
P1758AT - lock-up clutch not engagingWiring, lock-up control solenoid B, TCM
P1768AT - lock-up clutch not engagingWiring, linear solenoid, TCM
P1773AT - lock-up clutch not engagingWiring, clutch pressure control solenoid B, ECM
P1778Shift solenoid (SS) CWiring, shift solenoid, ECM
P1780AT – gear shift malfunctionOther AT trouble codes stored, ECM programming, ECM
P1786AT - poor gear shiftCommunication wire, ECM, TCM
P1787AT - lock-up clutch malfunctionCommunication wire, TCM
P1788AT - poor gear shiftCommunication wire, ECM, TCM
P1790AT - engine control module (ECM)ECM/Programming
P1791AT - lock-up clutch not engagingWiring, VSS, ECM
P1792AT - engine control module (ECM)ECM/Programming
P1793Automatic transmissionWiring, MAP sensor, TCM
P1794Automatic transmission - BARO signalWiring, ECM, TCM
P1795Automatic transmissionWiring, APP sensor, TCM
P1835AT - kick-down switch always ONWiring, kick-down switch, ECM
P1850AT - brake band solenoidWiring, brake band solenoid, ECM
P1860AT - torque converter clutch (TCC) solenoidWiring, TCC solenoid, ECM
P1870Transmission slipRange switch, mechanical failure, engine speed signal incorrect
P1879Problem in CVT Start Clutch Pressure Control Valve Assembly Circuit