C0000 – Vehicle Speed Information Circuit Malfunction
C0035 – Left Front Wheel Speed Circuit Malfunction
C0040 – Right Front Wheel Speed Circuit Malfunction
C0041 – Right Front Wheel Circuit Range/Performance (EBCM)
C0045 – Left Rear Wheel Speed Circuit Malfunction
C0046 – Left Rear Wheel Speed Sensor Circuit Range/Performance (EBCM)
C0050 – Right Rear Wheel Speed Circuit Malfunction
C0051 – LF Wheel Speed Sensor Circuit Range/Performance (EBCM)
C0060 – Left Front ABS Solenoid #1 Circuit Malfunction
C0065 – Left Front ABS Solenoid #2 Circuit Malfunction
C0070 – Right Front ABS Solenoid #1 Circuit Malfunction
C0075 – Right Front ABS Solenoid #2 Circuit Malfunction
C0080 – Left Rear ABS Solenoid #1 Circuit Malfunction
C0085 – Left Rear ABS Solenoid #2 Circuit Malfunction
C0090 – Right Rear ABS Solenoid #1 Circuit Malfunction
C0095 – Right Rear ABS Solenoid #2 Circuit Malfunction
C0110 – Pump Motor Circuit Malfunction
C0121 – Valve Relay Circuit Malfunction
C0128 – Low Brake Fluid Circuit Low
C0141 – Left TCS Solenoid #1 Circuit Malfunction
C0146 – Left TCS Solenoid #2 Circuit Malfunction
C0151 – Right TCS Solenoid #1 Circuit Malfunction
C0156 – Right TCS Solenoid #2 Circuit Malfunction
C0161 – ABS/TCS Brake Switch Circuit Malfunction
C0221 – Right Front Wheel Speed Sensor Circuit Open
C0222 – Right Front Wheel Speed Signal Missing
C0223 – Right Front Wheel Speed Signal Erratic
C0225 – Left Front Wheel Speed Sensor Circuit Open
C0226 – Left Front Wheel Speed Signal Missing
C0227 – Left Front Wheel Speed Signal Erratic
C0229 – Drop Out of Front Wheel Speed Signals
C0235 – Rear Wheel Speed Signal Circuit Open
C0236 – Rear Wheel Speed Signal Circuit Missing
C0237 – Rear Wheel Speed Signal Erratic
C0238 – Wheel Speed Mismatch
C0241 – EBCM Control Valve Circuit
C0245 – Wheel Speed Sensor Frequency Error
C0254 – EBCM Control Valve Circuit
C0265 – EBCM Relay Circuit
C0266 – EBCM Relay Circuit
C0267 – Pump Motor Circuit Open/Shorted
C0268 – Pump Motor Circuit Open/Shorted
C0269 – Excessive Dump/Isolation Time
C0271 – EBCM Malfunction
C0272 – EBCM Malfunction
C0273 – EBCM Malfunction
C0274 – Excessive Dump/Isolation Time
C0279 – Powertrain Configuration Not Valid
C0281 – Brake Switch Circuit
C0283 – Traction Switch Shorted to Ground
C0284 – EBCM Malfunction
C0286 – ABS Indicator Lamp Circuit Shorted to B+
C0287 – Delivered Torque Circuit
C0288 – Brake Warning Lamp Circuit Shorted to B+
C0290 – Lost Communications With PCM
C0292 – Lost Communications With PCM
C0291 – Lost Communications With BCM
C0297 – Powertrain Configuration Data Not Received
C0298 – Powertrain Indicated Traction Control Malfunction
C0300 – Rear Speed Sensor Malfunction
C0305 – Front Speed Sensor Malfunction
C0306 – Motor A or B Circuit
C0308 – Motor A/B Circuit Low
C0309 – Motor A/B Circuit High
C0310 – Motor A/B Circuit Open
C0315 – Motor Ground Circuit Open
C0321 – Transfer Case Lock Circuit
C0323 – T-Case Lock Circuit Low
C0324 – T-Case Lock Circuit High
C0327 – Encoder Circuit Malfunction
C0357 – Park Switch Circuit High
C0359 – Four Wheel Drive Low Range (4LO) Discrete Output Circuit
C0362 – 4LO Discrete Output Circuit High
C0367 – Front Axle Control Circuit High
C0374 – General System Malfunction
C0376 – Front/Rear Shaft Speed Mismatch
C0379 – Front Axle System
C0387 – Unable to Perform Shift
C0472 – Steering Handwheel Speed Sensor Signal V Low
C0473 – Steering Handwheel Speed Sensor Signal V High
C0495 – EVO Tracking Error
C0498 – Steering Assist Control Actuator Feed Circuit Low
C0499 – Steering Assist Control Solenoid Feed Circuit High
C0503 – Steering Assist Control Solenoid Return Circuit Low
C0504 – Steering Assist Control Solenoid Return Circuit High
C0550 – ECU Malfunction – internal write / checksum malfunction
C0559 – EEPROM Checksum Error
C0563 – Calibration ROM Checksum Error
C0577 – Left Front Solenoid Circuit Low
C0578 – Left Front Solenoid Circuit High
C0579 – Left Front Solenoid Circuit Open
C0582 – Right Front Solenoid Circuit Low
C0583 – Right Front Solenoid Circuit High
C0584 – Right Front Solenoid Circuit Open
C0587 – Left Rear Solenoid Circuit Low
C0588 – Left Rear Solenoid Circuit High
C0589 – Left Rear Solenoid Circuit Open
C0592 – Right Rear Solenoid Circuit Low
C0593 – Right Rear Solenoid Circuit High
C0594 – Right Rear Solenoid Circuit Open
C0611 – VIN Information Error
C0615 – Left Front Position Sensor Malfunction
C0620 – Right Front Position Sensor Malfunction
C0625 – Left Rear Position Sensor Malfunction
C0628 – Level Control Position Sensor Circuit High
C0630 – Right Rear Position Sensor Malfunction
C0635 – Left Front Normal Force Circuit Malfunction
C0638 – Left Front Normal Force Circuit High
C0640 – Right Front Normal Force Circuit Malfunction
C0643 – Right Front Normal Force Circuit High
C0655 – Level Control Compressor Relay Malfunction
C0657 – Level Control Compressor Circuit Low
C0658 – Level Control Compressor Circuit High
C0660 – Level Control Exhaust Valve Circuit Malfunction
C0662 – Level Control Exhaust Valve Circuit Low
C0663 – Level Control Exhaust Valve Circuit High
C0665 – Chassis Pitch Signal Circuit
C0690 – Damper Control Relay Circuit Malfunction
C0691 – Damper Control Relay Circuit Range
C0693 – Damper Control Relay Circuit High
C0695 – Position Sensor Overcurrent (8 volt supply)
C0696 – Position Sensor Overcurrent (5 volt supply)
C0710 – Steering Position Signal Malfunction
C0750 – Tire Pressure Monitor (TPM) system sensor not transmitting
C0755 – Tire Pressure Monitor (TPM) system sensor not transmitting
C0760 – Tire Pressure Monitor (TPM) system sensor not transmitting
C0765 – Tire Pressure Monitor (TPM) system sensor not transmitting
C0800 – Device Power #1 Circuit Malfunction
C0896 – Electronic Suspension Control (ESC) voltage is outside the normal range of 9 to 15.5 volts

P1400

DPFE Sensor Low Voltage (Mazda)

P1400

DPFE Sensor Low Voltage (Ford)

P1401

DPFE Sensor High Voltage (Mazda)

P1401

DPFE Sensor High Voltage (Ford)

P1403

DPFE Hoses Reversed (Mazda)

P1403

No 5 Volts To EGR Sensor (Chrysler)

P1404

Exhaust Gas Recirculation (EGR) Valve Pintle Stuck Open

P1405

DPFE Upstream Hose Off Or Plugged (Mazda)

P1405

DPFE Upstream Hose Off Or Plugged (Ford)

P1406

DPFE Downstream Hose Off Or Plugged (Mazda)

P1406

DPFE Downstream Hose Off Or Plugged (Ford)

P1407

EGR No Flow Detected (Mazda)

P1408

EGR Out Of Self Test Range (Mazda)

P1408

EGR Out Of Self Test Range (Ford)

P1409

Electronic Vacuum Regulator Control Circuit Malfunction (Mazda)

P1409

EGR Vacuum Regulator Solenoid Circuit Malfunction (Ford)

P1411

Secondary Air Injection System Downstream Flow (Ford)

P1413

Secondary Air Injection System Monitor Circuit Low (Ford)

P1414

Secondary Air Injection System Monitor Circuit High (Ford)

P1432

THTRC Circuit Failure (Ford)

P1441

Evaporative System Flow During Non-Purge

P1443

Evaporative Emission Control System (Mazda)

P1443

Small Or No Purge Flow Condition (Ford)

P1444

Purge Flow Sensor Low Input (Mazda)

P1445

Purge Flow Sensor High Input (Mazda)

P1450

Unable To Bleed Up Fuel Tank Vacuum (Ford)

P1451

EVAP Control System Canister Vent Solenoid Circuit Malfunction (Ford)

P1457

Leak Detected In EVAP Control Sys.(EVAP Canister Sys.) (Acura)

P1460

WOT A/C Cutoff Circuit Malfunction (Mazda)

P1460

WOT A/C Cutoff Circuit Malfunction (Ford)

P1461

ACP Sensor High Voltage (Ford)

P1462

ACP Sensor Low Voltage (Ford)

P1463

ACP Sensor Insufficent Pressure Change (Ford)

P1464

A/C Demand Out Of Range (Ford)

P1469

Low A/C Cycling Period (Ford)

P1474

HCF Primary Circuit Failure (Ford)

P1474

LFC Primary Circuit Failure (Ford)

P1476

Too Little Secondary Air (Chrysler)

P1477

Too Much Secondary Air (Chrysler)

P1477

MFC Primary Circuit Failure (Ford)

P1478

Battery Temp Sensor Volts Out of Limit (Chrysler)

P1479

HFC Primary Circuit Failure (Ford)

P1479

Transmission Fan Relay Circuit (Chrysler)

P1480

PCV Solenoid Valve (Chrysler)

P1482

Catalyst Temperature Sensor Circuit Shorted Low (Chrysler)

P1483

Engine Cooling System Performance

P1483

Catalyst Temperature Sensor Circuit Shorted High (Chrysler)

P1484

Catalytic Converter overheat Detected (Chrysler)

P1485

Air Injection Solenoid Circuit (Chrysler)

P1486

Evap Leak Monitor Pinched Hose (Chrysler)

P1487

Hi Speed Rad Fan CTRL Relay Circuit (Chrysler)

P1488

Auxiliary 5 Volt Supply Output Too Low (Chrysler)

P1489

High Speed Fan CTRL Relay Circuit (Chrysler)

P1490

Low Speed Fan CTRL Relay Circuit (Chrysler)

P1491

Rad Fan Control Relay Circuit (Chrysler)

P1491

Malfunction In EGR System (Acura)

P1492

Ambient/Batt Temp Sen Volts Too High (Chrysler)

P1493

Ambient/Batt Temp Sen Volts Too Low (Chrysler)

P1494

Leak Detection Pump Switch or Mechanical Fault (Chrysler)

P1495

Leak Detection Pump Solenoid Circuit (Chrysler)

P1496

5 Volt Supply Output Too Low (Chrysler)

P1498

High speed Rad Fan Ground CTRL Rly Circuit (Chrysler)

P1498

Voltage Problem In EGR Valve Position Sensor Circuit (Acura)

P1229

Supercharger Intercooler Pump Not Working (Ford)

P1232

Low Speed Fuel Pump Primary Circuit Malfunction (Ford)

P1233

Fuel System Disabled Or Offline (Ford)

P1234

Fuel System Disabled Or Offline (Ford)

P1235

Fuel Pump Control Out Of Range (Ford)

P1236

Fuel Pump Control Out Of Range (Ford)

P1237

Fuel Pump Secondary Circuit Malfunction (Ford)

P1238

Fuel Pump Secondary Circuit Malfunction (Ford)

P1244

Generator Load Low (Ford)

P1245

Generator Load Input High (Ford)

P1246

Generator Load Input Failed (Ford)

P1258

Engine Metal Over Temperature Protection

P1259

VTEC System Malfunction (Acura)

P1260

Fuel Pump Speed Relay Control Circuit (GM)

P1260

Theft Detected – Engine Disabled (Mazda)

P1260

Theft Detected – Engine Disabled (Ford)

P1270

Vehicle Speed Limiter Reached (Mazda)

P1270

Vehicle Speed Limiter Reached (Ford)

P1281

Engine Is Cold Too Long (Chrysler)

P1282

Fuel Pump Relay Control Circuit(Chrysler)

P1285

Cylinder Head Over Temperature Sensed (Ford)

P1288

Intake Manifold Short Runner Solenoid Circuit (Chrysler)

P1290

CHT Sensor Out Of Range (Ford)

P1289

Manifold Tune Valve Solenoid Circuit (Chrysler)

P1289

CHT Sensor High Input (Ford)

P1290

CNG Fuel Pressure Too High (Chrysler)

P1290

CHT Sensor Low Input (Ford)

P1291

No Temp Rise Seen From Fuel Heaters (Chrysler)

P1292

CNG Pressure Sensor Voltage Too High (Chrysler)

P1293

CNG Pressure Sensor Voltage Too Low (Chrysler)

P1294

Target Idle Not Reached (Chrysler)

P1295

No 5 Volts To TP Sensor (Chrysler)

P1296

No 5 Volts To MAP Sensor (Chrysler)

P1297

No Change in MAB From Start To Run (Chrysler)

P1297

Low Voltage ELD Circuit (Acura)

P1298

High Voltage In ELD Circuit (Acura)

P1298

Lean Operation At wide Open Throttle (Chrysler)

P1299

Vacuum Leak Found (IAC Fully Seated)(Chrysler)

P1299

Cylinder Head Over Temperature Protection Active (Ford)

P0200

Injector Circuit Malfunction

P0201

Injector Circuit Malfunction – Cylinder 1

P0202

Injector Circuit Malfunction – Cylinder 2

P0203

Injector Circuit Malfunction – Cylinder 3

P0204

Injector Circuit Malfunction – Cylinder 4

P0205

Injector Circuit Malfunction – Cylinder 5

P0206

Injector Circuit Malfunction – Cylinder 6

P0207

Injector Circuit Malfunction – Cylinder 7

P0208

Injector Circuit Malfunction – Cylinder 8

P0209

Injector Circuit Malfunction – Cylinder 9

P0210

Injector Circuit Malfunction – Cylinder 10

P0211

Injector Circuit Malfunction – Cylinder 11

P0212

Injector Circuit Malfunction – Cylinder 12

P0213

Cold Start Injector 1 Malfunction

P0214

Cold Start Injector 2 Malfunction

P0215

Engine Shutoff Solenoid Malfunction

P0216

Injection Timing Control Circuit Malfunction

P0217

Engine Overtemp Condition

P0218

Transmission Over Temperature Condition

P0219

Engine Over Speed Condition

P0220

Throttle/Pedal Position Sensor/Switch B Circuit Malfunction

P0221

Throttle/Pedal Position Sensor/Switch B Circuit Range/Performance Problem

P0222

Throttle/Pedal Position Sensor/Switch B Circuit Low Input

P0223

Throttle/Pedal Position Sensor/Switch B Circuit High Input

P0224

Throttle/Pedal Position Sensor/Switch B Circuit Intermittent

P0225

Throttle/Pedal Position Sensor/Switch C Circuit Malfunction

P0226

Throttle/Pedal Position Sensor/Switch C Circuit Range/Performance Problem

P0227

Throttle/Pedal Position Sensor/Switch C Circuit Low Input

P0228

Throttle/Pedal Position Sensor/Switch C Circuit High Input

P0229

Throttle/Pedal Position Sensor/Switch C Circuit Intermittent

P0230

Fuel Pump Primary Circuit Malfunction

P0231

Fuel Pump Secondary Circuit Low

P0232

Fuel Pump Secondary Circuit High

P0233

Fuel Pump Secondary Circuit Intermittent

P0234

Turbocharger Overboost Condition

P0235

Turbocharger Boost Sensor A Circuit Malfunction

P0236

Turbocharger Boost Sensor A Circuit Range/Performance

P0237

Turbocharger Boost Sensor A Circuit Low

P0238

Turbocharger Boost Sensor A Circuit High

P0239

Turbocharger Boost Sensor B Circuit Malfunction

P0240

Turbocharger Boost Sensor B Circuit Range/Performance

P0241

Turbocharger Boost Sensor B Circuit Low

P0242

Turbocharger Boost Sensor B Circuit High

P0243

Turbocharger Wastegate Solenoid A Malfunction

P0244

Turbocharger Wastegate Solenoid A Range/Performance

P0245

Turbocharger Wastegate Solenoid A low

P0246

Turbocharger Wastegate Solenoid A High

P0247

Turbocharger Wastegate Solenoid B Malfunction

P0248

Turbocharger Wastegate Solenoid B Range/Performance

P0249

Turbocharger Wastegate Solenoid B Low

P0250

Turbocharger Wastegate Solenoid B High

P0251

Injection Pump Fuel Metering Control “A” Malfunction (Cam/Rotor/Injector)

P0252

Injection Pump Fuel Metering Control “A” Range/Performance (Cam/Rotor/Injector)

P0253

Injection Pump Fuel Metering Control “A” Low (Cam/Rotor/Injector)

P0254

Injection Pump Fuel Metering Control “A” High (Cam/Rotor/Injector)

P0255

Injection Pump Fuel Metering Control “A” Intermittent (Cam/Rotor/Injector)

P0256

Injection Pump Fuel Metering Control “B” Malfunction (Cam/Rotor/Injector)

P0257

Injection Pump Fuel Metering Control “B” Range/Performance (Cam/Rotor/Injector)

P0258

Injection Pump Fuel Metering Control “B” Low (Cam/Rotor/Injector)

P0259

Injection lump Fuel Metering Control “B” High (Cam/Rotor/Injector)

P0260

Injection Pump Fuel Metering Control “B” Intermittent (Cam/Rotor/Injector)

P0261

Cylinder 1 Injector Circuit Low

P0262

Cylinder 1 Injector Circuit High

P0263

Cylinder 1 Contribution/Balance Fault

P0264

Cylinder 2 Injector Circuit Low

P0265

Cylinder 2 Injector Circuit High

P0266

Cylinder 2 Contribution/Balance Fault

P0267

Cylinder 3 Injector Circuit Low

P0268

Cylinder 3 Injector Circuit High

P0269

Cylinder 3 Contribution/Balance Fault

P0270

Cylinder 4 Injector Circuit Low

P0271

Cylinder 4 Injector Circuit High

P0272

Cylinder 4 Contribution/Balance Fault

P0273

Cylinder 5 Injector Circuit Low

P0274

Cylinder 5 Injector Circuit High

P0275

Cylinder 5 Contribution/Balance Fault

P0276

Cylinder 6 Injector Circuit Low

P0277

Cylinder 6 Injector Circuit High

P0278

Cylinder 6 Contribution/Balance Fault

P0279

Cylinder 7 Injector Circuit Low

P0280

Cylinder 7 Injector Circuit High

P0281

Cylinder 7 Contribution/Balance Fault

P0282

Cylinder 8 Injector Circuit Low

P0283

Cylinder 8 Injector Circuit High

P0284

Cylinder 8 Contribution/Balance Fault

P0285

Cylinder 9 Injector Circuit Low

P0286

Cylinder 9 Injector Circuit High

P0287

Cylinder 9 Contribution/Balance Fault

P0288

Cylinder 10 Injector Circuit Low

P0289

Cylinder 10 Injector Circuit High

P0290

Cylinder 10 Contribution/balance Fault

P0291

Cylinder 11 Injector Circuit Low

P0292

Cylinder 11 Injector Circuit High

P0293

Cylinder 11 Contribution/balance Fault

P0294

Cylinder 12 Injector Circuit Low

P0295

Cylinder 12 Injector Circuit High

P0296

Cylinder 12 Contribution/Balance Fault

P0298

Engine Oil Over Temperature

System Too Lean – Bank 1

Description:

How does a P0171 code trigger the check engine light? This code will trigger the check engine light as follows:

The adaptive fuel strategy in the vehicle’s computer constantly monitors the fuel delivery system to make sure the engine is running at an optimum air to fuel ratio, which is 14.7:1. The computer adjusts injector pulse width to regulate the amount of fuel going into the engine. The oxygen sensors relay information to the Powertrain Control Module (computer), informing it of the oxygen content in the exhaust. This information is translated by the computer, and used to determine if more or less fuel is needed. The computer will then adjust fuel flow (and possibly other related engine operating characteristics), to keep the correct air fuel mixture. This loop continues as long as the engine is running. Please refer to our article Oxygen Sensor Code Diagnosis for more info on this system. A P0171 check engine light code is set when the computer has reached a rich calibration limit and can not add enough fuel to maintain the correct mixture.

Possible Causes:

Refer to our Oxygen Sensor Code Diagnosis article for a list of all possible causes. The following is an overview of P0171 check engine light code possible causes.

Fuel System:

Leaking or faulty fuel pressure regulator
Plugged or dirty fuel filter or lines
Fuel pump weak or defective check valve
Injectors leaking or faulty
Low fuel pressure or running out of fuel
Leaking EVAP system components
Faulty FRP (Fuel Rail Pressure Sensor)

Air Intake System

Vacuum leaks
Contaminated, damaged or faulty Mass Air Flow sensor
PCV valve leak or stuck open
Air induction turbulance caused by wrong filter
Oil dipstick not seated
Air leaks after the Mass Air Flow Sensor (MAF)
Oil coated aftermarket air filter

Exhaust System

Any exhaust leak before or near the oxygen sensors

EGR System

Vacuum line disconnected from EGR System Module (ESM)
EGR valve, tube or gasket leak
EGR vacuum regulator valve leaking

Secondary Air Injection System

Mechanically stuck secondary air injection valve

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