P0202: Fallo en el circuito del inyector del cilindro 2 / Circuito abierto
El código de diagnóstico de falla (DTC) P0202 indica que el módulo de control del motor (ECM/PCM) ha detectado una discontinuidad eléctrica, circuito abierto o un perfil de corriente anormal en el circuito de control del inyector de combustible correspondiente al cilindro 2. En los sistemas diésel de riel común modernos, el ECM comanda cada inyector a través de un condensador elevador de alta tensión interno (80V-90V para inyectores electromagnéticos de solenoide, o 140V-200V para actuadores piezoeléctricos) con corrientes pico de activación de 20 a 30 amperios. El DTC P0202 se activa cuando la resistencia shunt de monitoreo de corriente interna del ECM detecta corriente nula (<0.05 A) durante el disparo comandado, un pico de tensión inductiva residual fuera de rango, o una resistencia eléctrica excesiva en el circuito del cilindro 2 durante más de 2 a 4 revoluciones consecutivas del motor.
🚗 Seguridad operativa, presupuesto estimado y verificación
- 01
🚦 Seguridad de conducción y riesgo mecánico
Evaluación mecánica inmediata y necesidad de grúaCircuito abierto / Fallo del inyector del cilindro 2 - Conducción limitada solo a baja velocidad
La ECU no logra cerrar el circuito eléctrico con el solenoide o actuador piezoeléctrico del inyector del cilindro 2. El cilindro 2 se encuentra completamente inoperativo (sin inyección de combustible). El motor vibrará con fuerza al operar en 3 cilindros. Puede circular en modo de emergencia de 5-10 millas (8-16 km) para ponerse a resguardo, pero debe evitar distancias largas.
PELIGROS MECÁNICOS SI CONTINÚA CONDUCIENDO:Tensiones severas por oscilación torsional que pueden fracturar el volante bimasa, rotura de los soportes del sistema de escape debido a las sacudidas del motor y sobrecalentamiento destructivo del catalizador. - 02
💰 Presupuesto típico de taller
Niveles de costo esperados para repuestos y mano de obraMantenimiento menor / Filtro$30 - $80: Reparación del conector/pigtail del inyector del cilindro 2 o retensado de pines de la terminal.Limpieza de sensor, cambio de filtro de combustible, revisión de fusibles o conectores.
Cambio de válvula / Sensor$190 - $420: Instalación de inyector de riel común reconstruido con arandela de cobre nueva.Sustitución de componente individual (válvula reguladora, unidad dosificadora o inyector reconstruido).
Reparación mayor / Bomba e inyectores$950 - $2,200+: Inyector OEM piezoeléctrico/solenoide nuevo original, tornillo de fijación y reaprendizaje/codificación IMA en la ECU.Revisión de bomba de alta presión, juego de inyectores nuevos o sustitución del conjunto DPF.
- 03
🧰 Verificaciones visuales rápidas en garaje
Chequeo de 5 minutos sin herramientas antes de ir al taller1Desconecte el inyector del cilindro 2: Verifique que las terminales hembra del conector no estén vencidas, abiertas o retraídas hacia atrás.2Mida la resistencia de la bobina del solenoide: Con un multímetro en escala de Ohmios (Ω) entre los 2 pines del inyector (un solenoide operativo debe marcar 0.2 - 0.5 ohmios; defectuoso marcará 0.0 o circuito abierto OL/infinito).3Inspeccione la traba plástica del conector: Si la pestaña de retención está rota, las vibraciones del motor desconectarán intermitentemente la ficha en caminos irregulares. - 04
🛡️ Protección ante diagnósticos erróneos en taller
Preguntas técnicas exactas para evitar sustituciones de piezas innecesarias"Indique al taller: 'Por favor, midan la resistencia de la bobina del inyector directamente sobre los pines antes de diagnosticar el reemplazo del inyector.'"
"Indique al taller: 'Realicen una prueba de movimiento (wiggle test) en el mazo de cables mientras monitorean el estado de resistencia y disparo del inyector en tiempo real con el escáner.'"
Nota técnica: Haga estas preguntas técnicas a su mecánico antes de autorizar presupuestos caros:
Triaje de taller en 30 segundos
- Violent engine shaking, severe shudder, and continuous misfire under idle and driving conditions (running on 3 cylinders)
- Severe loss of vehicle acceleration, sluggish throttle response, and inability to pull uphill loads
- Flashing or steady Check Engine Light (MIL) on dashboard, accompanied by flashing glow plug light and ESP/traction warning
- Internal open circuit or broken coil winding inside the Cylinder 2 fuel injector electromagnetic solenoid or piezo actuator
- Broken, chafed, or severed wiring harness wire between the ECM and the Cylinder 2 injector connector
- Corroded, spread, loose, or burned female terminal pins inside the Cylinder 2 two-pin injector electrical connector
Connect scan tool live telemetry: compare Target Fuel Rail Pressure vs Actual Rail Pressure and log metering valve command PWM duty cycle during idle and road load.
Expensive Diagnostic Pitfall & Technical Reality
P0202 means Cylinder 2 common rail fuel injector has failed internally and must be replaced immediately, along with reprogramming new IMA codes ($450 - $900).
While an open solenoid coil does occasionally occur, in over 70% of real-world P0202 occurrences, the injector itself is 100% functional. The failure is virtually always caused by terminal fretting corrosion inside the 2-pin wiring connector, cracked insulation on the engine rocker harness, or vibration-induced pin spread. Modern common rail engines pulse injectors at up to 150V/20A; even a microscopic 0.5-ohm increase in connector contact resistance causes the ECM's internal peak-and-hold driver circuit to detect a current fault and cut cylinder 2.
Spending $650 on a new injector plus coding labor vs testing coil resistance with a $20 multimeter (reading 0.35 ohms = good) and replacing the $15 harness pigtail connector, saving over $550.
Motores y plataformas de inyección más afectados
Este código de error afecta principalmente a las siguientes plataformas diésel common rail. Consulte su familia de motores para ver fallos típicos y referencias de piezas:
VAG 2.0 TDI (EA189 Common Rail)
Síntoma típico: Flashing coil lamp, violent engine stumble at idle, immediate limp mode
Fallo típico de fábrica: Cylinder 2 injector electrical plug locking tab cracked, allowing plug to vibrate loose and break electrical contact
OE 03L130277B / Bosch 0 445 110 369 Common Rail Fuel InjectorBMW 2.0d / 3.0d (N47 / N57 / M47N)
Síntoma típico: Drivetrain malfunction warning, severe misfire under acceleration, restricted engine speed
Fallo típico de fábrica: Oil seepage from swirl flap mechanism soaking Cylinder 2 injector harness loom and causing dielectric breakdown
OE 13537790093 / Bosch 0 445 110 131 Common Rail InjectorMercedes-Benz 2.1 CDI (OM651)
Síntoma típico: Check engine light illuminated, noticeable engine knock, reduced torque and acceleration
Fallo típico de fábrica: Delphi solenoid injector internal coil solder joint fatigue after high thermal cycles, creating intermittent open circuit
OE A6510704987 / Delphi 28342997 Common Rail Diesel InjectorFord / PSA 1.6 TDCi / HDi (DV6ATED4 / DLD-416)
Síntoma típico: Engine hesitation over bumps, rough idle, loss of acceleration power
Fallo típico de fábrica: Wiring loom rubs through against aluminum fuel filter bracket directly above Cylinder 2 injector
OE 0445110239 / PSA 1980J4 Bosch Common Rail Diesel InjectorCylinder Balance & Injector Deviation Guide
Common rail diesel cylinder balance & smooth running diagnostic guide. Balance rates, mg/stroke deviation, P0263 misfire, compression vs injector test.
Circuito de control y lógica del actuador
1. Dynamic In-Demand Fuel Metering
The common rail fuel injector on Cylinder 2 is actuated via two dedicated wires: a shared high-voltage high-side driver line (common to an injector bank) and an individual low-side switched ground line controlled by a dedicated power MOSFET inside the ECM. To open the injector needle against 2000 bar common rail hydraulic backpressure, the ECM discharges an 80V-200V boost capacitor across the terminals for 150-200 microseconds, generating a rapid 20A-30A current surge. Once the valve unseats, the ECM drops voltage to 12V-14V to maintain opening with a hold current of ~10A-12A before de-energizing to allow the return spring to snap the needle shut.
2. Closed-Loop PID Deviation Monitoring
The ECM driver circuit monitors the rate of current rise (di/dt) and peak current amplitude on Cylinder 2 during every combustion cycle. If an open circuit occurs (broken harness wire, backed-out terminal pin, or open solenoid coil winding), current flow is zero. If the driver circuit detects that current fails to reach calibrated minimum thresholds, the ECM immediately registers P0202. To protect the engine from severe rotational torsional imbalance and catalytic converter/DPF thermal damage, the ECM disables Cylinder 2 fuel injection entirely and triggers Limp-Home Mode.
3. Diagnostic Trap: Normally Open (NO) vs Normally Closed (NC) Valves
The Cross-Swapping Diagnostic Proof: In common rail workshops, never replace an expensive injector for P0202 based on a scan tool code alone! Because an open circuit can exist either inside the injector coil or in the wiring harness/ECM driver, perform the standardized cross-swap: swap the Cylinder 2 injector with Cylinder 1 (recording the respective IMA/QR calibration codes). If the trouble code moves from P0202 to P0201, the injector's internal coil winding is 100% defective. If the code remains on P0202 on Cylinder 2, the wiring harness or ECM output driver is broken.
Valores físicos eléctricos e hidráulicos
Protocolo de Diagnóstico de Taller Paso a Paso
Cylinder 2 Injector Coil Resistance & Thermal Stability Test
Turn the ignition OFF and disconnect the Cylinder 2 injector connector. Using a high-precision digital multimeter with lead-zeroing on the lowest ohms scale (200 Ω), measure resistance across the two injector terminals at 20°C. Solenoid injector: 0.20-0.45 Ω; Piezo injector: 180-220 kΩ. An infinite reading (OL) confirms a severed internal coil winding. Measure insulation resistance from both terminals to the injector steel body with a 250V Megohmmeter (must exceed >10 MΩ).
Cylinder 2 Wiring Harness Continuity & Resistance Audit
Disconnect the main harness connector from the ECM. Using wiring schematics, identify the high-side power feed pin and low-side ground driver pin for Cylinder 2. Measure end-to-end resistance from the ECM plug to the Cylinder 2 injector connector: resistance must be less than 0.4 Ω on both wires. Flex and shake the engine harness along the valve cover while measuring to detect intermittent breaks.
Short-to-Ground & Short-to-Power Harness Isolation Test
With the ECM and Cylinder 2 injector disconnected, measure resistance between each harness wire and vehicle chassis ground. Resistance must be infinite (OL). Next, measure resistance between the injector wires and all other pins in the harness, as well as to 12V battery power. Any measurable continuity (<10 kΩ) indicates rubbed-through wire insulation.
Connector Pin Fretting & Mechanical Drag Tension Inspection
Inspect the female terminals inside the Cylinder 2 injector connector with a bright inspection light and 10x magnifier. Look for green copper corrosion, arcing burns, or terminal spread. Insert a new male terminal test pin into each female cavity to check mechanical retention drag force (must exceed 2.5 N). Loose terminal drag causes microsecond electrical disconnects that trigger P0202 under engine vibration.
Oscilloscope Current Clamp Waveform Analysis
Reconnect the injector and attach a high-bandwidth inductive current clamp (set to 0-40A scale) around one of the Cylinder 2 injector wires. Connect the clamp to an oscilloscope and start the engine. A healthy waveform shows a rapid 20A-30A peak pull-in current spike, followed by a flat 10A-12A hold plateau. Zero current confirms an open circuit; an erratic square wave confirms an ECM driver stage failure.
Standardized Physical Cross-Swap Isolation Test
If wiring and coil resistance test borderline, remove the Cylinder 2 injector and swap it with Cylinder 1 (retaining new copper seating washers). Program the respective IMA/QR codes. Clear DTCs and start the engine. If the code shifts to P0201, the injector has an internal thermal failure under high-voltage load. If the code stays on P0202, the fault is 100% in the harness or ECM.
Reparación de hardware y lista de piezas BOM
Cylinder 2 Fuel Injection Control Stage & Wire Harness
0 445 110 369 / 0 445 116 059
High-speed electro-hydraulic injector delivering multiple micro-injection events per combustion cycle
1 928 498 056 / Tyco Junior Power Timer 2-Way
Gold-plated/tin-plated female terminals with positive spring retention locking clips
OEM Heat-Shielded Injector Sub-Loom
Protects injector command lines from constant 120°C hot engine oil splash
Calculadora interactiva de tolerancias Common Rail
Componentes de inyección asociados
Las siguientes bombas de combustible e inyectores common rail originales están verificados para motores con el código P0202. Verifique las presiones de trabajo antes del reemplazo:
0445110131BOSCH
BOSCH 0445110131 Common Rail Injector for BMW 320d / 330d / 530d / 730d / X5 M47N & M57N Euro 3
View Technical Specs & Fitment →0445110239BOSCH
0445110239 Injector: PSA 1.6 HDi Ford 1.6 TDCi Specs
View Technical Specs & Fitment →0445110369BOSCH
0445110369 Injector: VW 2.0 TDI EA189 CFFB CFHC Specs
View Technical Specs & Fitment →095000-5880Denso
095000-5880 Denso Toyota 2KD-FTV Injector: 23670-30050 Data
View Technical Specs & Fitment →28337917Delphi
28337917 Delphi Bobcat D24 Injector: 7030364 Specs & Data
View Technical Specs & Fitment →095000-8340Denso
095000-8340 Denso Mitsubishi 4D56 HP Injector: 1465A367 Data
View Technical Specs & Fitment →Reinicio de adaptación de bomba y ciclo de rodaje
Following replacement of the Cylinder 2 fuel injector, injector harness repair, or ECM replacement, complete the calibration protocol:
1. Enter the new 6-to-30 digit alphanumeric calibration code (IMA / QR code) stamped on the top of the new Cylinder 2 injector into the ECM via scan tool.
2. Clear all stored trouble codes and ensure battery voltage is fully charged (>12.5 V).
3. Access scan tool 'Engine Control Module' -> 'Special Functions' -> select 'Reset Cylinder Balance / Smooth Running Adaptation Values'.
4. Start the engine: allow it to idle at full operating temperature (coolant >80°C / 176°F) for 5 minutes without touching the accelerator pedal.
5. Accelerate vehicle smoothly in 4th gear to 80 km/h (2200 RPM), then release throttle completely to coast down in gear to 35 km/h (minimum 8s overrun).
6. Repeat this acceleration and coast-down sequence 4 times to allow the ECM to calibrate zero-fuel pilot injection delivery for Cylinder 2.
Diagnóstico diferencial y códigos relacionados
Injector Circuit/Open - Cylinder 1
Identical electrical circuit fault on Cylinder 1; used for physical cross-swapping to isolate whether the failure follows the injector hardware or stays with the vehicle wiring.
Cylinder 2 Injector Circuit Low
Specific low-circuit voltage fault on Cylinder 2, indicating that the driver wire is directly shorted to vehicle chassis ground.
Cylinder 2 Misfire Detected
Direct mechanical consequence: because the ECM cannot fire the Cylinder 2 injector, Cylinder 2 fails to generate combustion torque, setting misfire code P0302.
Casos reales de taller
2015 Vauxhall/Opel Insignia 2.0 CDTI (A20DTH)(176,000 km)
Preguntas técnicas frecuentes
¿Qué significa el código de fallo P0202?
El código de diagnóstico de falla (DTC) P0202 indica que el módulo de control del motor (ECM/PCM) ha detectado una discontinuidad eléctrica, circuito abierto o un perfil de corriente anormal en el circuito de control del inyector de combustible correspondiente al cilindro 2. En los sistemas diésel de riel común modernos, el ECM comanda cada inyector a través de un condensador elevador de alta tensión interno (80V-90V para inyectores electromagnéticos de solenoide, o 140V-200V para actuadores piezoeléctricos) con corrientes pico de activación de 20 a 30 amperios. El DTC P0202 se activa cuando la resistencia shunt de monitoreo de corriente interna del ECM detecta corriente nula (<0.05 A) durante el disparo comandado, un pico de tensión inductiva residual fuera de rango, o una resistencia eléctrica excesiva en el circuito del cilindro 2 durante más de 2 a 4 revoluciones consecutivas del motor.
¿Cuáles son los síntomas más comunes de P0202?
Violent engine shaking, severe shudder, and continuous misfire under idle and driving conditions (running on 3 cylinders), Severe loss of vehicle acceleration, sluggish throttle response, and inability to pull uphill loads, Flashing or steady Check Engine Light (MIL) on dashboard, accompanied by flashing glow plug light and ESP/traction warning, Heavy puffing of white or grey unburned diesel smoke from exhaust pipe during cold start and acceleration, Strong, pungent odor of raw diesel fuel surrounding the vehicle exhaust and engine bay, Scan tool live data shows Cylinder 2 contribution balance pegged at maximum positive fuel trim (+4.5 to +6.0 mg/stroke).
¿Qué causa P0202 en un motor diésel?
Internal open circuit or broken coil winding inside the Cylinder 2 fuel injector electromagnetic solenoid or piezo actuator; Broken, chafed, or severed wiring harness wire between the ECM and the Cylinder 2 injector connector; Corroded, spread, loose, or burned female terminal pins inside the Cylinder 2 two-pin injector electrical connector; Burnout of the internal low-side power MOSFET driver transistor for Cylinder 2 inside the Engine Control Module (ECM); Water intrusion or green corrosion inside the main engine wiring harness bulkhead connector; Valve cover or intake manifold wiring harness pinched to ground under a metal retaining bracket.
¿Es seguro conducir con el código P0202 activo?
🔴 Crítico: Detener vehículo / Grúa inmediata
¿Cuánto cuesta reparar el código de avería P0202?
Los costes habituales de reparación para P0202 dependen de la causa raíz identificada en el diagnóstico: Nivel 1 (Mantenimiento menor / DIY): $30 - $80: Reparación del conector/pigtail del inyector del cilindro 2 o retensado de pines de la terminal. (Limpieza de sensor, cambio de filtro de combustible, revisión de fusibles o conectores.); Nivel 2 (Sustitución de componente): $190 - $420: Instalación de inyector de riel común reconstruido con arandela de cobre nueva. (Sustitución de componente individual (válvula reguladora, unidad dosificadora o inyector reconstruido).); Nivel 3 (Subconjunto mayor): $950 - $2,200+: Inyector OEM piezoeléctrico/solenoide nuevo original, tornillo de fijación y reaprendizaje/codificación IMA en la ECU. (Revisión de bomba de alta presión, juego de inyectores nuevos o sustitución del conjunto DPF.). Tarifas de referencia de talleres. Más del 70% de las incidencias se resuelven en Nivel 1 o 2 sin sustituir subconjuntos completos.
Can I drive my vehicle with trouble code P0202 active?
No, you should avoid driving except to clear the roadway safely. Driving with an active P0202 means Cylinder 2 is completely dead. The severe rotational unbalance puts intense torsional shock on the crankshaft, timing chains, and dual-mass flywheel (DMF). Furthermore, if the circuit fault is intermittent, unburned fuel entering the exhaust will overheat and melt the expensive catalytic converter and DPF filter.
How do I locate Cylinder 2 on my diesel engine?
On standard inline 4-cylinder engines (VAG TDI, Ford TDCi, BMW 2.0d, Mercedes OM651), Cylinder 1 is almost universally at the front of the engine closest to the timing belt/chain serpentine drive, and Cylinder 4 is at the rear next to the transmission/flywheel. Therefore, Cylinder 2 is the second cylinder from the front timing cover. (Note: On certain French engines like Peugeot/Renault, cylinder numbering is reversed, with Cylinder 1 starting at the flywheel end-always consult vehicle service manuals).
Why do I need to enter an IMA/QR code when replacing the Cylinder 2 injector?
Common rail injectors are manufactured with sub-micron tolerances, but microscopic variations in flow rate and needle response time are inevitable. During factory testing, each injector is tested across several pressure points, generating a precision calibration code (IMA/QR code) that encodes its exact manufacturing offsets. Entering this code into the ECM ensures the computer knows the exact microsecond pulse width required to deliver identical fuel mass into Cylinder 2, preventing rough idle and knocking.