The Complete Volvo Fault Code List (2026 Update)

Written By Kevin Vieth

When it comes to maintaining and troubleshooting Volvo vehicles, having access to a comprehensive fault code list is invaluable. Reading fault codes is the best way to know the root cause of performance issues, and also essential for maintaining driver safety in heavy-duty vehicles.

Understanding these codes allows for efficient diagnosis and resolution of potential issues that can affect the vehicle's performance and safety. This article will provide a complete Volvo fault code list to help facilitate and simplify your repairs. 

What Are Volvo Fault Codes/DTC Codes

Volvo fault codes, also known as DTC (Diagnostic Trouble Codes), are standardized codes used by Volvo vehicles to identify specific issues within the engine, transmission, or other vehicle systems. These codes are generated by the vehicle’s onboard diagnostic system (OBD) whenever a malfunction is detected.

How to Retrieve a Volvo Fault Code or DTC Code

  1. Automatically using an OBD-11 diagnostic scanner. 

    1. For passenger vehicles and hobbyists, Autel is a great choice for essential diagnostics that blend capability with affordability. It should have all you need.

      1. Let us find the perfect Autel scanner for you!

    2. For heavy-duty Volvo vehicles, including commercial, off-highway, and marine vehicles, Jaltest is our #1 choice for businesses who manage a large fleet of multi-brand vehicles. Jaltest is designed to work for any make or model, and has tons of capabilities outside of fault code reading, helping you maximize your fleet’s performance and efficiency. 

      1. Book a Jaltest demo today!

  2. Manually using the odometer reset button. 

    1. Code will appear on the odometer display in numbers. If not in numbers, then the engine light will flash to indicate a number. 

    2. You need to press and hold the odometer reset and trip buttons while simultaneously turning the ignition on. You may need to do this in multiple cycles.

    3. Read more about how to manually read fault codes without a scanner here.

What Do Volvo Fault Codes/DTC Codes Typically Look Like

Volvo fault codes, or DTCs, usually consist of a combination of letters and numbers. The letters indicate the system affected, such as:

  • P for powertrain (engine and transmission)

  • B for body

  • C for chassis

  • U for network/communication issues

The numbers that follow identify the specific fault within that system. For example, a code like P0420 signals an issue with the catalytic converter efficiency in the powertrain system.

The Complete Volvo Fault Code List (DTC Codes) (2026 Update)

Fault Code Description / Common Causes
P0010Wiring problem or faulty Powertrain Control Module (PCM).
P0011Engine issue. Low engine oil, worn timing chain, faulty camshaft, or faulty variable valve timing actuator.
P0013Wiring problem or Powertrain Control Module (PCM) issue.
P0014Engine issue. Low engine oil, worn timing chain, faulty camshaft, or faulty variable valve timing actuator.
P0102Mass Air Flow (MAF) circuit issue. Damaged/corroded terminals, wiring faults, or faulty MAF sensor.
P0113Intake air temperature sensor problem. Possible faulty MAF sensor, clogged air filter, or wiring issue.
P0128Cooling system issue. Malfunctioning cooling fans, coolant temperature sensor, or thermostat.
P0135Oxygen sensor heater circuit malfunction. Faulty O2 sensor or damaged wiring.
P0171Engine running lean. Too much air or insufficient fuel in combustion mixture.
P0200Fuel injector circuit malfunction. Injector clogged, dirty, faulty, or wiring issue.
P0202Fuel injector cylinder 2 malfunction. Faulty or clogged injector or wiring problem.
P0300Random/multiple cylinder misfire. Possible ignition, fuel pressure, MAF, or engine timing issues.
P0401EGR flow insufficient. Faulty EGR valve, DPFE sensor, or EGR control solenoid.
P0420Catalyst efficiency below threshold (Bank 1). Catalytic converter or O2 sensor issue.
P0430Catalyst efficiency below threshold (Bank 2). Catalytic converter or engine efficiency issue.
P0440EVAP system malfunction. Loose gas cap, fuel tank leak, or faulty EVAP component.
P0500Vehicle Speed Sensor (VSS) malfunction. Drive gear, transmission, or faulty VSS.
P0505Idle control system issue. Vacuum leaks, wiring faults, or faulty IAC valve.
P0600Serial communication link malfunction. PCM or vehicle data network issue.
P0601Internal Control Module memory checksum error. Possible PCM failure.
P0602Control Module programming error. PCM programming or wiring issue.
P0603Keep Alive Memory (KAM) failure in control module.
P0605Internal control module ROM failure.
P0700Transmission control system malfunction. Wiring, fluid, or TCM issue.
P0720Output speed sensor circuit malfunction. Wiring, fluid level, or faulty sensor.
P0730Incorrect gear ratio detected. Transmission fluid or component issue.
P0841Transmission fluid pressure sensor/switch “A” range/performance issue.
P0A0DHigh voltage system interlock circuit high.
P0A0FEngine failed to start. Possible ECU, fuel, ignition, or electrical issue.
P0A80Replace hybrid battery pack.
P0B22Hybrid battery voltage sense “D” circuit erratic. Possible BECM failure.
P2101Throttle actuator “A” motor circuit range/performance issue.
P2181Cooling system performance issue.
BCM-0021Right front wheel sensor faulty signal.
BCM-0061Brake disc temperature too high.
BCM-0094Communication problem with Differential Electronic Module (DEM).
BCM-0108Communication issue with SAS control module not initiated.
BCM-0109SAS internal communication fault.
BCM-0130Brake pressure sensor 1 signal too low.
CEM-1A05X-power supply signal too high.
CEM-1A0950-power supply signal too high.
CEM-1A52Communication with Driver Door Module (DDM) missing.
CEM-4F00Reset button activated too long.
CEM-6E01Fuel hatch switch activated too long.
CEM-8A20Left low beam signal too low.
CEM-8A21Right low beam signal too low.
CEM-8B01Position lamps signal too low.
CEM-8C11Front fog switch activated too long.
CEM-8F06Hazard light switch signal missing.
CEM-8F2EWindshield wipers signal too low.
DDM-E010Control module internal fault.
DEM-0006Pump faulty signal.
DEM-0007Hydraulic pressure faulty value.
PSM-002BOperating button activated too long.
REM-4F44Parking assistance sensor 3 faulty signal.
REM-6A01Central lock motor switch signal too high.
REM-6A02Central lock motor switch signal too high.
REM-6A03Central lock motor switch signal too low.
SAS-000BControl module internal fault.
SAS-000ESteering wheel angle sensor internal fault.
P0012Camshaft variable timing solenoid failure, low engine oil level, incorrect engine timing, improper oil specification, variable valve timing actuator failure, or worn timing chain.
P0101Large vacuum leaks, split intake air boot or PCV hose, defective intake manifold gaskets, faulty or dirty MAF sensor, barometric pressure sensor issue, wiring problem, or PCM software update required.
P0174Engine running lean (Bank 2). Vacuum leaks, faulty MAF sensor, weak fuel pump, plugged fuel filter, dirty injectors, or PCM software update required.
P0201Fuel injector cylinder 1 malfunction. Defective injector, clogged injector, or wiring/connection issue.
P0203Fuel injector cylinder 3 malfunction. Injector failure, PCM issue, or wiring fault.
P0205Fuel injector cylinder 5 malfunction. Injector failure, PCM issue, or wiring fault.
P0301Cylinder 1 misfire. Worn spark plugs, ignition components, vacuum leak, low fuel pressure, faulty sensors, or internal engine problem.
P0302Cylinder 2 misfire. Worn spark plugs, ignition components, vacuum leak, low fuel pressure, faulty sensors, or internal engine problem.
P0303Cylinder 3 misfire. Worn spark plugs, ignition components, vacuum leak, low fuel pressure, faulty sensors, or internal engine problem.
P0304Cylinder 4 misfire. Worn spark plugs, ignition components, vacuum leak, low fuel pressure, faulty sensors, or internal engine problem.
P0441EVAP incorrect purge flow. Faulty purge valve, damaged fuel cap, filler neck damage, EVAP hose leak, or vent valve issue.
P0442Small EVAP leak detected. Loose/damaged fuel cap, small hose leak, carbon canister damage, faulty pressure sensor, or leak detection pump issue.
P0455Large EVAP leak detected. Missing fuel cap, damaged EVAP hose, vent valve failure, carbon canister damage, or fuel tank issue.
P0501Vehicle Speed Sensor (VSS) range/performance issue. Faulty VSS, wiring problem, speedometer issue, or drive gear fault.
P0506Idle speed lower than expected. Faulty/sticking idle air control motor, vacuum leak, throttle body carbon buildup, or power steering pressure switch issue.
P0507Idle speed higher than expected. Faulty/sticking idle air control motor, vacuum leak, throttle body carbon buildup, charging system issue, or coolant temperature sensor fault.
P0705Transmission range sensor (PRNDL) malfunction. Faulty sensor, wiring issue, valve body issue, or dirty transmission fluid.
P0706Transmission range sensor range/performance issue. Faulty PRNDL sensor, wiring issue, linkage problem, or valve body fault.
P0842Transmission fluid pressure sensor/switch “A” circuit low. Low fluid level, faulty sensor, TCM issue, or wiring problem.
P0845Transmission fluid pressure sensor/switch “B” circuit malfunction. Low fluid level, faulty sensor, TCM issue, or wiring problem.
P0846Transmission fluid pressure sensor/switch “B” range/performance issue. Low fluid level, faulty sensor, TCM issue, or wiring problem.
P0847Transmission fluid pressure sensor/switch “B” circuit low. Low fluid level, faulty sensor, TCM issue, or wiring problem.
P0901Clutch actuator circuit range/performance issue. Clutch master cylinder, solenoid, or TCM failure.
P0935Hydraulic pressure sensor circuit issue. Hydraulic power unit failure, TCM issue, or wiring problem.
P0942Hydraulic pressure unit issue. Hydraulic assembly failure, TCM issue, or wiring fault.
P0944Hydraulic pressure unit loss of pressure. Low fluid, clogged filter, oil pump failure, or wiring issue.
P0961Transmission pressure control solenoid failure.
P0A08DC/DC converter status circuit issue. Inverter/converter assembly failure, PCM issue, or wiring fault.
P0A7FHybrid battery deterioration. Poor HV battery connections, battery failure, or ECU issue.
P0B24Hybrid battery voltage sense circuit issue. BECM failure, high voltage battery issue, or wiring problem.
P0B26Hybrid battery voltage sense circuit issue. BECM failure, high voltage battery issue, or wiring problem.
P0B28Hybrid battery voltage sense circuit issue. BECM failure, high voltage battery issue, or wiring problem.
P0B30Hybrid battery voltage sense circuit issue. BECM failure, high voltage battery issue, or wiring problem.
P0C00Drive motor generator inverter control module failure.
P0C09Drive motor generator assembly or inverter control module failure.
P0C11Drive motor inverter cooling system issue. Coolant leak, cooling fan failure, water pump failure, or inverter control module issue.
P0C14Drive motor inverter cooling system issue. Coolant leak, cooling fan failure, water pump failure, or inverter control module issue.
P0C15Drive motor inverter cooling system issue. Coolant leak, cooling fan failure, water pump failure, or inverter control module issue.
P2000Diesel Particulate Filter (DPF) efficiency below threshold. DPF failure, intake air leak, or dirty MAF sensor.
P2002Diesel Particulate Filter (DPF) efficiency below threshold. DPF failure, intake air leak, or dirty MAF sensor.
P2004Intake Manifold Runner Control (IMRC) stuck open. Failed actuator, intake manifold linkage issue, or wiring problem.
P2006Intake Manifold Runner Control (IMRC) stuck closed. Actuator failure, restricted vacuum lines, or PCM issue.
P2122Accelerator Pedal Position (APP) sensor circuit low input. APP failure, throttle motor issue, PCM fault, or wiring problem.
P2135Throttle/Pedal Position Sensor voltage correlation issue. APP failure, TPS failure, PCM issue, or wiring problem.
P2138Throttle/Pedal Position Sensor voltage correlation issue. APP failure, TPS failure, PCM issue, or wiring problem.
P2210NOx sensor circuit issue. Faulty NOx sensor, PCM issue, or wiring problem.
P2213NOx sensor circuit issue. Faulty NOx sensor, PCM issue, or wiring problem.
P2237Oxygen sensor positive current control circuit open. Exhaust leak, faulty O2 sensor, PCM issue, or wiring fault.
P2238Oxygen sensor positive current control circuit low. Exhaust leak, faulty O2 sensor, PCM issue, or wiring fault.
P2251Oxygen sensor negative current control circuit open. Exhaust leak, faulty O2 sensor, PCM issue, or wiring fault.
P2302Ignition coil circuit malfunction. Coil failure, PCM issue, or wiring problem.
P2303Ignition coil circuit malfunction. Coil failure, PCM issue, or wiring problem.
P2305Ignition coil circuit malfunction. Coil failure, PCM issue, or wiring problem.
P2308Ignition coil circuit malfunction. Coil failure, PCM issue, or wiring problem.
P2310Ignition coil circuit malfunction. Coil failure, PCM issue, or wiring problem.
P2401EVAP leak detection pump control circuit low. Pump failure, PCM issue, or wiring problem.
P2402EVAP leak detection pump control circuit high. Pump failure, PCM issue, or wiring problem.
P2422EVAP vent valve stuck closed. Vent valve failure, PCM issue, or wiring problem.
P2431Secondary air injection system pressure sensor circuit range/performance issue. Solenoid failure, PCM issue, or wiring problem.
P2432Secondary air injection system pressure sensor circuit low. Solenoid failure, PCM issue, or wiring problem.
P2500Charging system voltage low. Alternator failure, battery issue, PCM fault, or wiring problem.
P2501Charging system voltage high. Alternator failure, battery issue, PCM fault, or wiring problem.
P2503Charging system voltage low. Alternator failure, battery issue, or wiring problem.
P2509PCM power input signal intermittent. PCM failure, relay issue, or wiring fault.
P250CEngine oil level sensor circuit issue. Sensor failure, PCM fault, or wiring problem.
P2601Coolant Heat Storage (CHS) pump control circuit issue. Pump failure, relay issue, PCM fault, or wiring problem.
P2607Intake air heater circuit malfunction. Heater failure, PCM issue, or wiring problem.
P2609Intake air heater circuit performance issue. Heater failure, PCM issue, or wiring problem.
P2610PCM internal timer performance issue. Internal PCM failure or power/ground circuit problem.
P2614Camshaft position signal issue. Broken tone ring, CMP sensor failure, PCM issue, or wiring problem.
P2706Transmission shift solenoid malfunction. TCM failure, low fluid level, or wiring issue.
P2711Transmission unexpected mechanical gear disengagement. Internal transmission failure, TCM issue, or low fluid level.
P2714Transmission pressure control solenoid malfunction. TCM failure, low fluid level, or wiring issue.
P2716Transmission pressure control solenoid malfunction. TCM failure, low fluid level, or wiring issue.
P2723Transmission pressure control solenoid malfunction. TCM failure, low fluid level, or wiring issue.
P2803Transmission range sensor circuit malfunction. PCM/TCM issue, sensor failure, or wiring problem.
P2806Transmission range sensor out of adjustment. PCM/TCM issue, sensor failure, or wiring problem.
P2809Transmission pressure control solenoid malfunction. TCM failure, low fluid level, or wiring issue.
P2810Transmission pressure control solenoid malfunction. TCM failure, low fluid level, or wiring issue.
P2815Transmission pressure control solenoid malfunction. TCM failure, low fluid level, or wiring issue.
P2A00Oxygen sensor circuit range/performance issue. Exhaust leak, faulty O2 sensor, PCM issue, or wiring fault.
P2A01Oxygen sensor circuit issue. Exhaust leak, faulty O2 sensor, PCM issue, or wiring fault.
P2A03Oxygen sensor circuit issue. Exhaust leak, faulty O2 sensor, PCM issue, or wiring fault.
P2A04Oxygen sensor circuit issue. Exhaust leak, faulty O2 sensor, PCM issue, or wiring fault.
P2BA8NOx sensor circuit fault or DPF issue. Faulty NOx sensors, harness issue, poor electrical connection, or DPF failure.
P3000High voltage battery control system malfunction. Low fuel level, HV battery failure, or insufficient charge.
P3100High voltage powertrain control module failure.
P3400Cylinder deactivation system malfunction.
P3401Cylinder deactivation performance issue. Low engine oil, PCM issue, VVT solenoid failure, or wiring problem.
B0081Airbag deployment loop fault. Wiring issue, control module problem, or airbag system fault.
C0040Wheel speed sensor malfunction. Sensor failure, reluctor issue, ABS module problem, or wiring fault.
U0001High-speed CAN communication bus fault.
U0073Control module communication bus “A” off. Faulty control module or CAN bus issue.
U0100Lost communication with PCM. CAN bus fault or control module issue.
U0107Lost communication with throttle actuator control module. Dead battery, TAC module failure, or CAN bus issue.
U0121Lost communication with ABS control module. Dead battery, ABS module failure, or CAN bus issue.
Kevin Vieth

Kevin Vieth founded VieTech Training & Consulting Inc. in 2016 out of a passion for empowering heavy-duty and automotive service technicians through technical training. Due to the fast pace of technological advancements, he believes that on-going knowledge and skill development is imperative. With the operational pressures applied to business managers, skills training can be inconvenient, inaccessible and costly. This motivated Kevin to develop the Diesel Engine Technology Fundamentals in-class training curriculum to provide relevant and realistic diesel technology diagnostic training that is on-site, on-time and on-budget.

As a former technical Training Instructor for Cummins Western Canada, Kevin has delivered over 125 Cummins engine certification courses to over 500 heavy-duty technicians. Prior to his time with Cummins, he worked as a journeyman 310S automotive technician and then spent 3 years as a technical lead for Westport Innovations, a world leader in natural gas fuel system development. Kevin’s experience as a service technician, combined with his knowledge of fuel, emissions and engine controls acquired at Westport, helped him excel as a Cummins trainer and in diesel engine fault troubleshooting.

In addition to delivering on-site diesel engine diagnostic training to fleets nation-wide, Kevin also provides on-going remote troubleshooting and technical support to his clients.

https://www.vietech.ca
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