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Honda Civic Fault Codes


You can find common Honda Civic fault codes on this page that when clicked take you to a detailed description.

You can also type in the fault code you are getting below to find a more detailed description.

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Do you know the fault code already? Enter it in the box below and hit "Search Codes".

Honda Civic Recalls

When a car manufacturer detects a problem with a model they put out a recall notice and more often than not offer to fix the problem free of charge.

You can check to see if your Honda Civic has any recall notices on our sister site AutoRecalls.co, sorted by model year.

View Honda Civic Recalls ยป
Recall Notice Icon
Severity Icon 7/10

Error Icon P0420

Catalyst System Efficiency Below Threshold (Bank 1)

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Severity Icon 4/10

Error Icon P0128

Coolant Thermostat (Coolant Temp Below Thermostat Regulating Temperature)

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Error Icon P0497

Evaporative Emission System Low Purge Flow

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Severity Icon 6/10

Error Icon P0135

O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)

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Error Icon P0740

Torque Converter Clutch Circuit Malfunction

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Severity Icon 8/10

Error Icon P0113

Intake Air Temperature Circuit High Input

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Severity Icon 4/10

Error Icon P0455

System Gross Leak Evaporative Emission

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Severity Icon 7/10

Error Icon P0171

System Too Lean (Bank 1)

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Error Icon P0108

Manifold Absolute Pressure/Barometric Pressure Circuit High Input

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Severity Icon 8/10

Error Icon P0301

Cylinder 1 Misfire Detected

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Error Icon P0328

Knock Sensor 1 Circuit High Input (Bank 2 or Single Sensor)

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Severity Icon 8/10

Error Icon P0340

Camshaft Position Sensor Circuit Malfunction

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Error Icon P0339

Crankshaft Position Sensor A Circuit Intermittent

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Severity Icon 5/10

Error Icon P0172

System Too Rich (Bank 1)

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Error Icon P0498

Evaporative Emission System Vent Control Circuit Low

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Error Icon P0730

Incorrect Gear Ratio

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Error Icon P0336

Crankshaft Position Sensor A Circuit Range/Performance

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Error Icon P0118

Engine Coolant Temperature Circuit High Input

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Error Icon P0111

Intake Air Temperature Circuit Range/Performance Problem

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Severity Icon 3/10

Error Icon P0507

Idle Control System RPM higher Than Expected

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Error Icon P0122

Throttle/Pedal Position Sensor/Switch A Circuit Low Input

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Severity Icon 6/10

Error Icon P0141

O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)

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Severity Icon 7/10

Error Icon P0134

O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)

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Error Icon P0139

O2 Sensor Circuit Slow Response (Bank 1 Sensor 2)

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Severity Icon 3/10

Error Icon P0456

Evaporative Emissions System Small Leak Detected

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Severity Icon 4/10

Error Icon P0101

Mass or Volume Air flow Circuit Range/Performance Problem

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Severity Icon 6/10

Error Icon P0341

Camshaft Position Sensor Circuit Range/Performance

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Severity Icon 3/10

Error Icon P0325

Knock Sensor 1 Circuit (Bank 2 or Single Sensor)

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Severity Icon 9/10

Error Icon P0299

Turbo / Super Charger Underboost

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Error Icon P0560

System Voltage Malfunction

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Severity Icon 8/10

Error Icon P0087

Fuel Rail/System Pressure - Too Low

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Error Icon P0443

Evaporative Emission Control System Purge Control Valve circuit Malfunction

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Error Icon P0035

Turbo/Super Charger Bypass Valve Control Circuit High

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Error Icon P0843

Transmission Fluid Pressure Sensor/Switch A Circuit High

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Error Icon P1457

EVAP Emission Control System Leak Detected (Control Canister System)

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Error Icon P0365

Camshaft Position Sensor B Circuit (Bank 2)

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Severity Icon 8/10

Error Icon P0303

Cylinder 3 Misfire Detected

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Error Icon P0344

Camshaft Position Sensor Circuit Intermittent

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Severity Icon 8/10

Error Icon P0606

ECM/PCM Processor Fault

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Error Icon P0685

ECM/PCM Power Relay Control Circuit/Open

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Error Icon P2647

Rocker Arm Actuator System Stuck on Bank 1

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Error Icon P0847

Transmission Fluid Pressure Sensor/Switch B Circuit Low

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Error Icon P0848

Transmission Fluid Pressure Sensor/Switch B Circuit High

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Severity Icon 8/10

Error Icon P0170

Fuel Trim Malfunction (Bank 1)

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Error Icon P0505

Idle Control System Malfunction

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Error Icon P1157

Lack Of HO2S22 Switch - Sensor Indicates Lean

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Error Icon P1337

CSF Sensor No Signal

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Error Icon P1600

ECM BATT Malfunction

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Error Icon P1753

Automatic Transaxle Concerns

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Error Icon P1768

Automatic Transaxle Concerns

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Error Icon P1298

Electrical Load Detector Circuit High Input

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Error Icon P1259

VTEC System Malfunction

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Error Icon P1456

EVAP Emission Control System Leak Detected (Fuel Tank System)

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Error Icon P1129

MAP Higher Than Expected

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Error Icon P2127

Throttle Position Sensor E Circuit Low Input

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Error Icon P2176

Throttle Actuator Control System - Idle Position Not Learned

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Error Icon P1361

Intermittent Interruption In TDC 1 Sensor Circuit

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Error Icon P1362

No Signal In TDC 1 Sensor Circuit

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Error Icon P1399

Glow Plug Circuit High Side, High Input

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Error Icon P1505

Idle Speed Control Actuator Signal Low

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Severity Icon 6/10

Error Icon P0131

O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1)

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Error Icon P1705

Automatic Transaxle Concerns

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Error Icon P1300

Multiple Cylinder Misfire Detected

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Severity Icon 6/10

Error Icon P0138

O2 Sensor Circuit High Voltage (Bank 1 Sensor 2)

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Error Icon P1509

IAC Valve Circuit Failure

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Severity Icon 6/10

Error Icon P3400

Cylinder Deactivation System Bank 1

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Error Icon B1240

Wiper Washer Rear Pump Relay Circuit Failure

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Error Icon P2646

Rocker Arm Actuator System Performance

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Error Icon U0121

Lost Communication With Anti-Lock Brake System (ABS) Control Module

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Severity Icon 9/10

Error Icon U0100

Lost Communication With ECM/PCM "A"

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Severity Icon 7/10

Error Icon U0155

Lost Communication With Instrument Panel Cluster (IPC) Control Module

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Error Icon U0122

Lost Communication With Vehicle Dynamics Control Module

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Error Icon U0151

Lost Communication With Restraints Control Module

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Severity Icon 9/10

Error Icon U0073

Control Module Communication Bus "A" Off

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Error Icon U0101

Lost Communication with TCM

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Honda Civic Image

About the Civic

The iconic Civic first made its debut in 1972. Since then, there have been a total of 11 generations to be released. The latest of these first hit the markets in 2021.

As a testament to its legendary status, It is one of the all-time best-selling cars in history. As of 2021, over 27 million models have been sold across the globe.

The model has been rebadged countless times for various markets over the years. It has also come in a huge range of body styles, with the 5-door liftback being by far the most famous of all.

In the highly competitive class, the Civic goes up against the equally-iconic Ford Focus, Volkswagen Golf, and Opel Astra.

One of the most common problems owners have encountered is P0420, which indicates a problem with the catalytic converter.

On older models, the most common cause of this issue is a failed catalytic converter. This usually comes as a result of the converter reaching its lifespan. Other issues can include exhaust leaks upstream of the converter.

Fault code P0128 is another problem that Civic owners have encountered fairly commonly. This code indicates that the engine coolant is not reaching its desired temperature.

One of the most common causes of this code is a faulty thermostat. Owners have found his cheap fix is one of the most effective solutions.

Another common issue is fault code P0497, which indicates that there is a problem with the purge flow in the EVAP system.

Owners have reported that the purge control valve is susceptible to clogging and other issues that can cause this issue. This means that it, along with any other faulty components in the EVAP system, needs to be replaced.