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Diagnostic code references — Page 59.

Browse canonical reference entries. Each definition keeps its own source and vehicle-applicability limits.

11,786 code references

Kia
P1497

EGR Stepper Motor Malfunction Circuit 2 1.8L

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Acura / Honda
P1498

Honda EGR position-feedback voltage high

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Dodge / Jeep +2
P1498

High Speed Rad Fan Ground CTRL Rly Circuit

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Kia
P1498

EGR Stepper Motor Malfunction Circuit 3 1.8L

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Dodge / Jeep +2
P1499

the Jeep hydraulic cooling-fan control circuit

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Kia
P1499

EGR Stepper Motor Malfunction Circuit 4 1.8L

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BMW
P1500

Idle Speed Control Valve Stuck Open

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Buick / Cadillac +6
P1500

Starter Signal Circuit

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Ford / Lincoln +1
P1500

Ford vehicle-speed interruptions interfere with other OBD tests

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Geo
P1500

Starter Signal Circuit Fault

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Kia
P1500

No Vehicle Speed Signal to TCM

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Lexus
P1500

Starter Signal Circuit Malfunction

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Mitsubishi
P1500

Alternator FR Terminal Circuit

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Subaru
P1500

Radiator Fan Relay 1 Circuit Malfunction

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Suzuki
P1500

Engine Starter Signal Circuit Fault

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Volkswagen
P1500

Fuel Pump Relay Electrical Circuit Malfunction

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BMW
P1501

Idle Speed Control Valve Stuck Closed

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Buick / Cadillac +5
P1501

Vehicle Speed Sensor Circuit Intermittent

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Ford / Lincoln +1
P1501

Ford detects vehicle-speed input during a stationary self-test

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Subaru
P1501

Idle Control System Malfunction Fail Safe

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Volkswagen
P1501

Fuel Pump Relay Circuit Short To Ground

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BMW
P1502

Idle Speed Control Valve Closing Solenoid Control Circuit Signal High Or Low

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Buick / Cadillac +5
P1502

Theft Deterrent System No Password Received

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Ford / Lincoln +1
P1502

Ford speed-information error requests transmission-lamp indication

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Subaru
P1502

Radiator Fan Function Problem

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Volkswagen
P1502

Fuel Pump Relay Circuit Short To B+

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BMW
P1503

Idle Speed Control Valve Closing Solenoid Control Circuit Signal Low

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Buick / Cadillac +5
P1503

Theft Deterrent System Password Incorrect

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Volkswagen
P1503

Volkswagen alternator DF load signal and the BEW measuring-value note

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BMW
P1504

Idle Speed Control Valve Closing Solenoid Control Open Circuit

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Buick / Cadillac +5
P1504

Vehicle Speed Output Circuit

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Ford / Lincoln +1
P1504

Ford idle-air control output has an electrical-load fault

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Volkswagen
P1504

Intake Air System Bypass Leak Detected

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BMW
P1505

Idle Speed Control Valve Closing Solenoid Control Circuit Electrical

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Ford / Lincoln +1
P1505

Idle Air Control System at Adaptive Clip

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Kia
P1505

Idle Air Control Valve Opening Coil Voltage Low

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Volkswagen
P1505

Closed Throttle Position Does Not Close Open Circuit

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BMW
P1506

Idle Speed Control Valve Open Solenoid Control Circuit Signal High

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Ford / Lincoln +1
P1506

Ford actual idle speed exceeds the requested speed

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Kia
P1506

Idle Air Control Valve Opening Coil Voltage High

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Volkswagen
P1506

Closed Throttle Position Switch Does Not Open Short To Ground

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BMW
P1507

Idle Speed Control Valve Open Solenoid Control Circuit Signal Low

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Ford / Lincoln +1
P1507

Ford actual idle speed stays below the requested speed

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Kia
P1507

Idle Air Control Valve Closing Coil Voltage Low

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Subaru
P1507

Idle Control System Malfunction Fail Safe

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Volkswagen
P1507

Idle System Learned Value Lower Limit Attained

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BMW
P1508

Idle Speed Control Valve Opening Solenoid Control Open Circuit

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Buick / Cadillac +5
P1508

IAC System Low RPM

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Acura / Honda
P1508

IAC Valve Circuit Failure

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Kia
P1508

Idle Air Control Valve Closing Coil Voltage High

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Jaguar / Mazda
P1508

Idle Air Control Circuit Open

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Volkswagen
P1508

the upper idle-regulation limit can point toward restricted intake air

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BMW
P1509

Idle Speed Control Valve Opening Solenoid Control Circuit Electrical

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Buick / Cadillac +5
P1509

High idle and the idle-airflow response test

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Jaguar / Mazda
P1509

Idle Air Control Circuit Shorted

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Volkswagen
P1509

Idle Air Control Circuit Electrical Malfunction

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BMW
P1510

Idle Speed Control Valve Stuck

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Buick / Cadillac +5
P1510

Back UP Power Supply

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Geo
P1510

Backup Power Supply Fault

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Kia
P1510

Idle Air Control Valve Closing Coil High Voltage

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Lexus
P1510

Intake Air Volume Too Low With Supercharger On

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Subaru
P1510

Subaru idle-air signal 1 low input

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Suzuki
P1510

PCM Backup Power Supply Circuit Fault

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Toyota
P1510

Boost Pressure Control Circuit

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Volkswagen
P1510

Idle Air Control Circuit Short To B+

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BMW
P1511

DISA Control Circuit Electrical

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Buick / Cadillac +5
P1511

Throttle Control System Backup System Performance

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Subaru
P1511

Subaru idle-air signal 1 high input

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Toyota
P1511

Boost Pressure Low

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Volkswagen
P1511

Intake Manifold Changeover Valve Circuit Electrical Malfunction

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BMW
P1512

DISA Control Circuit Signal Low

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Ford / Lincoln +1
P1512

Intake Manifold Runner Control Stuck Closed

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Subaru
P1512

Subaru idle-air signal 2 low input

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Toyota
P1512

Boost Pressure High

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Volkswagen
P1512

Intake Manifold Changeover Valve Circuit Short To B+

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BMW
P1513

DISA Control Circuit Signal High

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Ford / Lincoln +1
P1513

Intake Manifold Runner Control Stuck Closed

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Kia
P1513

Idle Air Control Valve Closing Coil Low Voltage

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Subaru
P1513

Subaru idle-air signal 2 high input

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Volkswagen
P1513

Intake Manifold Changeover Valve 2 Circuit Short To B+

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Buick / Cadillac +5
P1514

Airflow disagrees with the throttle-based estimate

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Jaguar / Mazda
P1514

High Load Neutral Drive Fault

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Subaru
P1514

Idle Air Control Solenoid Signal 3 Circuit Low Input

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Volkswagen
P1514

Intake Manifold Changeover Valve 2 Circuit Short To Ground

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Buick / Cadillac +5
P1515

Measured throttle position differs from the modeled position

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Kia
P1515

A/T To M/T Codification

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Subaru
P1515

Idle Air Control Solenoid Signal 3 Circuit High Input

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Volkswagen
P1515

Intake Manifold Changeover Valve Circuit Short To Ground

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Buick / Cadillac +5
P1516

Throttle Actuator Control (TAC) Module Throttle Actuator Position Performance

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Ford / Lincoln +1
P1516

Ford bank-one intake-runner input needs mechanical and feedback checks

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Jaguar / Mazda
P1516

Gear Change Neutral Drive Fault

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Subaru
P1516

Idle Air Control Solenoid Signal 4 Circuit Low Input

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Volkswagen
P1516

Intake Manifold Changeover Valve Circuit Open

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Buick / Cadillac +5
P1517

Throttle Actuator Control (TAC) Module Performance

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Ford / Lincoln +1
P1517

Ford bank-two intake-runner monitor input is outside its expected range

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Jaguar / Mazda
P1517

Cranking Neutral Drive Fault

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Subaru
P1517

Idle Air Control Solenoid Signal 4 Circuit High Input

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Volkswagen
P1517

Main Relay Circuit Electrical Malfunction

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Buick / Cadillac +5
P1518

Throttle Actuator Control (TAC) Module Serial Data Circuit

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Ford / Lincoln +1
P1518

Ford intake-runner feedback indicates an open position at closed throttle

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These are code references, not a list of confirmed faults on every vehicle. Read the source and applicability notes, then match the exact vehicle, year, engine and scan report.