JCB Error Code List / JCB Fault Codes

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JCB machinery, renowned for its durability and versatility, often relies on a standardized system of Diagnostic Trouble Codes (DTCs) to identify and address issues within its various systems. These codes provide valuable insights into specific malfunctions, allowing operators and technicians to swiftly diagnose problems and take appropriate corrective measures. In this guide, we’ll delve into the structure of JCB fault codes, explore their meanings, and outline diagnostic procedures to effectively address these issues.

Structure of JCB Fault Codes

DTCs, also known as Diagnostic Trouble Codes, follow a structured format that aids in classifying and pinpointing the nature of a malfunction. The structure, as per the J2012 standard, comprises a 7-digit code, each digit contributing to the identification of different aspects of the fault:

  1. 1st Character: Identifies the vehicle system affected.
    • P = Power Train
    • C = Chassis
    • U = Network
  2. 2nd and 3rd Characters: Define the subsystem within the vehicle system.
    • Examples: Transmission, CAN network, brakes, etc.
  3. 4th and 5th Characters: Identify the specific component, circuit, or fault.
    • Examples: Starter relay, fuel pressure regulator, etc.
  4. 6th and 7th Characters (Fault Type Bytes – FTB): Indicate the specific fault condition.
    • Examples: Short to ground, internal system fault, circuit voltage issues, etc.

Accessing and Displaying Fault Codes

JCB equipment offers several methods to access and display fault codes, providing operators and technicians with the necessary information for diagnosis and resolution:

  1. CAN Bus Display: Some machines are equipped with a CAN-bus based display. This display can show registered fault codes and may allow operators to clear the fault code log.
  2. Computer Connected to CAN Bus: Access to registered fault codes can be achieved by connecting a suitable laptop with relevant diagnostic software to the machine’s CAN bus socket using a data transfer adapter (DLA). This method allows for viewing and erasing fault codes.

Diagnostic Actions and Protective Measures

When a malfunction is detected, the Engine Control Unit (ECU) takes specific actions based on the severity of the issue, aiming to protect the engine or machine from potential damage. The ECU can perform the following actions:

  1. Inaction: If the ECU determines no immediate risk, it continues normal operation. However, addressing the malfunction promptly is advisable.
  2. Low Torque Mode: Engine output is reduced to mitigate potential damage. This mode prompts the operator to stop the machine at the earliest opportunity.
  3. Emergency Mode of Movement to Repair: Engine output and speed are further limited to minimize damage. The machine should be stopped as soon as possible.
  4. Engine Shutdown: In critical situations, the ECU may automatically shut off the engine to prevent imminent failure.

Sample JCB Fault Codes and Meanings

Here’s a sample of JCB fault codes, along with their meanings, as part of the diagnostic process:

  1. P0087: Too Low Pressure in the Fuel Line/System
  2. P0095: Intake Air Temperature Sensor 2 Circuit
  3. P0110: Intake Air Temperature Sensor 1 Circuit
  4. P0190: Circuit “A” of the Fuel Pressure Sensor in the Highway
  5. P0261: Low Signal of the Injector Circuit of the 1st Cylinder
  6. P0335: Circuit “A” Crankshaft Position Sensor
  7. P0500: “A” Vehicle Speed Sensor
  8. P0560: System Voltage
  9. P0655: Malfunction of the Engine Test Indicator Light (CEL)
  10. U0121: Lost Communication With Anti-Lock Brake System (ABS) Control Module

Fault Byte Number (FTB) Numbers

  • 00 No subtype information
  • 02 General fault with signal
  • 04 Internal system fault (ECU)
  • 07 Mechanical failure
  • 05 System programming failure
  • 09 Component malfunction
  • 11 Short to ground (SC2G)
  • 12 Battery short circuit (SC2VBAT)
  • 13 Open circuit (OS)
  • 16 Circuit voltage below an an acceptable threshold
  • 17 Circuit voltage above an acceptable threshold
  • 18 Circuit current below an acceptable threshold
  • 19 Circuit current above an acceptable threshold
  • 1A Circuit Resistance Above Threshold
  • 1B Circuit resistance below an acceptable threshold
  • 1C Circuit voltage out of range
  • 1F Intermittent circuit
  • 23 Constantly low signal
  • 24 Constantly high signal
  • 26 Rate of change of signal below an acceptable threshold value
  • 27 The rate of change of the signal is above an an acceptable threshold value
  • 29 Invalid signal
  • 2F Volatile Signal
  • 31 No signal (skipped / missing)
  • 36 Signal frequency too low
  • 37 Signal frequency too high
  • 38 Wrong signal frequency
  • 45 Program memory failure
  • 46 Calibration/parameter memory failure
  • 47 Malfunction of self-monitoring system / microcontroller / microprocessor
  • 4B temperature rise
  • 54 No calibration
  • 64 Malfunction of signal acceptability
  • 62 Signal comparison failure
  • 72 Actuator stuck open
  • 73 Actuator stuck closed
  • 71 Actuator stuck
  • 81 Received network data contains error
  • 85 Signal out of range
  • 86 Invalid CAN signal
  • 88 BUS OFF
  • 9A Operating conditions for a component or system
  • 92 Performance or malfunction
  • 96 Component malfunction or internal malfunction
  • 97 Component or system is obstructed or blocked
  • 98 Temperature rise of a component or system

If a malfunction is detected, the computer determines the severity of the malfunction and can take measures to protect the engine or machine from potential damage.

An ECU can take one of four of the following actions:

Inaction

The computer has decided that there is no direct risk to the engine or machine and that the engine is operating normally. Nevertheless, measures should be taken to rectify the malfunction as soon as possible.

Low Torque Mode:

The engine output is reduced in order to reduce the voltage and temperature of the engine, and to minimize its damage. Machines should be stopped at the earliest opportunity to prevent further damage.

Emergency mode of movement to the place of repair work:

Engine output is limited and engine speed is reduced to reduce engine voltage and temperature, and to minimize damage to the engine. Stop the machine as soon as possible to prevent further damage.

Engine muffling / delayed engine muffling

The engine control unit automatically shuts off the engine to prevent an impending failure.

Fault Codes – Numeric List

• Click on the DTC to go to the specific device information and troubleshooting procedure.

P0001 The control circuit of the fuel volume regulator is open

P0002 Range / Performance of the fuel volume regulator control circuit

P0003 Low signal of the control circuit of the fuel volume regulator

P0004 High signal volume control circuit of the fuel volume regulator

P0016 Relationship between the position of the crankshaft and the position of the camshaft

P0087 Too low pressure in the fuel line/system

P0088 Too high pressure in the fuel line/system

P0089 Fuel Pressure Regulator 1 Performance

P0090 The control circuit of the fuel pressure regulator 1 is open

P0091 Low signal control circuit of the fuel pressure regulator 1

P0092 High signal of the control circuit of the fuel pressure regulator 1

P0095 Intake Air Temperature Sensor 2 Circuit

P0096 Intake Air Temperature Sensor 2 Range / Performance

P0097 Low signal circuit intake air temperature sensor 2

P0098 High Intake Air Temperature Sensor 2 Circuit

P0099 Intermittent/erratic intake air temperature sensor 2 circuit

P0105 Manifold Absolute Pressure / Barometric Pressure Circuit

P0106 Range / Performance of the manifold absolute pressure / barometric pressure circuit

P0110 Intake Air Temperature Sensor 1 Circuit

P0111 Low signal circuit intake air temperature sensor 1

P0124 High signal circuit intake air temperature sensor 1

P0113 High signal circuit intake air temperature sensor 1

P0115 Circuit 1, engine coolant temperature sensor

P0116 Range / Performance of circuit 1 of the coolant temperature sensor

engine

P0117 Low signal circuit 1 of the engine coolant temperature sensor

P0118 High signal circuit 1 temperature sensor engine coolant

P0120 Throttle / Pedal Position Sensor / Switch A Circuit

P0121 Range / Performance of “A” Sensor / Throttle / Pedal Position Switch

P0180 Circuit “A” fuel temperature sensor

P0181 Range / Performance of the fuel temperature sensor circuit “A”

P0182 Low signal circuit A “fuel temperature sensor

P0183 High signal circuit “A” fuel temperature sensor

P0190 Circuit “A” of the fuel pressure sensor in the highway

P0191 Range / Performance of circuit “A” of the fuel pressure sensor in the line

P0192 Low signal circuit “A” of the fuel pressure sensor in the highway

P0193 High signal circuit “A” of the fuel pressure sensor in the highway

P0194 Intermittent / unstable signal of the circuit “A” of the fuel pressure sensor in the highway

P0200 Injector circuit open

P0201 Injector circuit open – 1st cylinder

P0202 Injector circuit open – 2nd cylinder

P0203 Injector circuit open – 3rd cylinder

P0204 Injector circuit open – 4th cylinder

P0205 Injector circuit open – 5th cylinder

P0206 Injector circuit open – 6th cylinder

P0218 Transmission Fluid Over Temperature

P0220 Circuit “B” of the sensor / switch throttle / pedal position

P0236 Range / Performance of circuit “A” of turbocharger / supercharger boost sensor

P0252 Range / Performance “A” of the fuel pump fuel meter (cam / rotor / injector)

P0253 Low signal “A” of the fuel metering device of the high pressure fuel pump

(camshaft / rotor / injector)

P0254 High signal “A” fuel metering pump fuel (cam / rotor / injector)

P0261 Low signal of the injector circuit of the 1st cylinder

P0262 High signal injector circuit 1 cylinder

P0263 Deposit / balancing of the 1st cylinder

P0264 Low signal of the injector circuit of the 2nd cylinder

P0265 High signal circuit injector 2nd cylinder

P0266 contribution / balancing of the 2nd cylinder

P0267 Low signal of the injector circuit of the 3rd cylinder

P0268 High signal circuit injector 3rd cylinder

P0269 Contribution / balancing of the 3rd cylinder

P0270 Injector 4 Low Signal

P0271 High signal injector circuit 4th cylinder

P0272 Deposit / balancing of the 4th cylinder

P0273 Low signal of the injector circuit of the 5th cylinder

P0274 High signal injector circuit 5th cylinder

P0275 Contribution / balancing of the 6th cylinder

P0276 Low signal of the injector circuit of the 6th cylinder

P0277 High signal circuit injector 6th cylinder

P0278 Contribution / balancing of the 6th cylinder

P029A The balancing of the 1st cylinder by fuel production is at the maximum limit

meaning

P029B The balancing of the 1st cylinder by fuel production is at the minimum limit

meaning

P029E The balancing of the 2nd cylinder by fuel production is at the maximum limit

meaning

P029F The balancing of the 2nd cylinder by fuel production is at the minimum limit

meaning

P02A2 The balancing of the 3rd cylinder by fuel production is at the maximum limit

meaning

P02A3 The balancing of the 3rd cylinder by fuel production is at the minimum limit

meaning

P02A6 Balancing of the 4th cylinder by fuel production is at the maximum limit

meaning

P02A7 Balancing of the 4th cylinder with fuel production is at the minimum limit

meaning

P02A8 Balancing of the 5th cylinder by fuel production is at the maximum limit

meaning

P02A9 Balancing of the 5th cylinder by fuel production is at the minimum limit

meaning

P02A10 The balancing of the 6th cylinder by fuel production is at the maximum limit

P02A11 The balancing of the 6th cylinder by fuel production is at the minimum limit

P02EE Range 1 / Injector Circuit Performance

P02EF Range / Performance of the Injector Chain of the 2nd Cylinder

P02F0 Range / Performance of the injector circuit of the 3rd cylinder

P02F1 Range / Performance 4 Injector Circuit

P02F2 Range / Performance 5th Injector Circuit

P02F3 Range / Performance 6th Injector Circuit

P0335 Circuit “A” crankshaft position sensor

P0340 Circuit “A” camshaft position sensor

P0341 Range / Performance of the camshaft position sensor circuit “A”

P0371 Excessive number of pulses “A” signal high-resolution time stamps

P0372 Too low number of pulses “A” signal high-resolution time stamps

P0374 No pulse “A” signal high-resolution time stamps

P0500 “A” vehicle speed sensor

P0501 Range / Performance “A” of the vehicle speed sensor

P0503 Intermittent / unstable/high signal “A” of the vehicle speed sensor

P0520 Low oil pressure warning light control circuit

P0521 Range / Performance of the engine oil pressure sensor/switch

P0522 High oil pressure

P0523 Low oil pressure

P0560 System Voltage

P0562 System Low Voltage

P0563 System High Voltage

P0566 Signal “off” (“Off”) cruise control

P0567 Cruise Control Resume Signal

P0569 Cruise control “Coast” signal

P0570 Cruise Control Accelerate Signal

P0575 Cruise Control Input Circuit

P0602 Control Module Programming Error

P0603 Standby memory error (CAM) of the internal control module

P0604 RAM error (RAM) of the internal control module

P0605 Read-only memory error (ROM) of the internal control module

P0606 Functional malfunction of the security system

P0607 Functional malfunction of the security system

P060A Functional Security Malfunction

P060B Functional malfunction of the security system

P0612 Control circuit of the engine speed relay

P0615 Starter Relay Circuit

P0616 Starter Relay Circuit Low

P0617 Starter Relay Circuit High

P061B Functional malfunction of the security system

P061C Functional malfunction of the security system

P061E Functional malfunction of the security system

P0627 Global Fuel Pump Malfunction – Open Circuit

P0628 Global fuel pump malfunction – short to ground

P0629 Global fuel pump malfunction – short to battery

P062B Functional malfunction of the security system

P062D Fuel Injector Control Circuit Performance

P062E Fuel Injector Control Performance

P062F EEPROM error of the internal control module

P0630 VIN code not programmed or incompatible – ECM / PCM

P0641 Circuit “A” of the reference voltage of the sensor is open

P0650 Malfunction Indicator Light (MIL) Control Circuit

P0651 Circuit “B” of the reference voltage of the sensor is open

P0655 Malfunction of the engine test indicator light (CEL)

P0656 output circuit of the fuel level sensor

P0668 PCM / ECM / TCM Internal Temperature Sensor Circuit A Low

P0669 High signal circuit “A” internal temperature sensor PCM / ECM / TCM

P0685 ECM / PCM power relay control circuit open

P0697 Circuit “C” of the reference voltage of the sensor is open

P1101 Positive malfunction of a pressure control error in the line

P1102 Negative malfunction of a pressure control error in the line

P1103 Malfunction of pressure in the line

P1104 Injector Update Failure

P1105 Injector Update Failure

P1106 Injector Update Failure

P1107 Injector Update Failure

P1108 Injector Update Failure

P1109 Injector Update Failure

P110A Injector Update Failure

P110B Injector Update Failure

P1500 Faulty foot choke / pedal – emergency mode of movement to the place of repair work

P1501 Foot Choke / Pedal Failure – Low Torque

P1503 Faulty hand throttle – emergency mode of movement to the venue

repair work

P1504 Manual Throttle Malfunction – Low Torque

P1506 Global Throttle / Pedal Failure – Emergency Travel Mode

repair work

P1509 CAN bus communication error with TSC

P1602 Global Starter Relay Control Circuit

P1603 Functional malfunction of the security system

P1604 Functional malfunction of the security system

P1605 Functional malfunction of the security system

P1606 Functional malfunction of the security system

P2120 Fault channel 1 signal hand pedal

P2125 Malfunction of channel 2 of a signal of a manual pedal

P2135 “A” / “B” Voltage Matching of Throttle / Pedal Position Sensor / Switch

P2138 Hand pedal signal mapping failure

P2147 Malfunction (cutoff) of the injector voltage source

P2148 Malfunction (cutoff) of the injector voltage source

P2226 Chain “A” of the barometric pressure sensor

P2228 Low signal circuit “A” barometric pressure sensor

P2229 High signal circuit “A” barometric pressure sensor

P2264 Sensor circuit for water in the fuel

P2265 Range / Performance of the fuel water sensor circuit

P2266 Low fuel water sensor circuit signal

P2267 High fuel water sensor circuit signal

P2269 State of water in the fuel

P250B Range / Performance Engine Oil Level Sensor Circuit

P256A Idling Sensor / Switch Circuit

open

P256B Range / Performance Sensor / Switch Selector Speed

engine idling

P256C Engine Idle Selector Sensor / Switch Low

P256D High Idle Sensor / Selector Speed Sensor Signal

U0001 High speed CAN data bus

U0073 Bus A of the control module data transmission is off

U0100 Communication failure with ECM / PCM “A”

U0121 Lost Communication With Anti-Lock Brake System (ABS) Control Module

U0401 Invalid data received from ECM / PCM “A”

U3FFF DTC SAE does not exist – specific manufacturer data required

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