Fault code P0272 – a step-by-step guide to diagnosing and fixing it

The meaning of error code P0272 – Cylinder 4 Contribution/Balance Fault

P0272: Causes, signs and repairs

Error code P0272 is displayed and the check engine light is on - what does this mean?

The OBD system has detected a fault in the injection valve of cylinder 4, specifically a low circuit. This DTC P0272 indicates that the control unit has measured too low a voltage or an interruption in the electrical circuit of the fourth injector.

What causes can this error code have?

Defective injection valve cylinder 4
Damaged wiring to the injection valve
Corroded or loose plug connections
Defective engine control unit (ECM/PCM)
Blown fuse in the injection system
Short circuit in the vehicle wiring
Oxidized contacts on the injection valve connector

What symptoms occur in parallel with fault code P0272?

Engine running unsteadiness: Uneven idling and jerky engine
Loss of power: Reduced engine power, especially when accelerating
Increased fuel consumption: Engine runs inefficiently due to lack of injection
Starting problems: Difficult starting or longer starting times
Exhaust problems: Increased emissions and black smoke
Check engine light: Permanently lit check engine light

How to fix the problem of error code P0272?

The repair requires a systematic diagnosis of the electrical components of the injection system.
Replace injection valve cylinder 4: Replace defective valve with new original or high-quality spare part, including seals and O-rings
Repair wiring: Locate damaged cables to the injection valve, repair severed areas or replace complete wiring harness
Clean and secure plug connections: Dismantle all plugs on the injection valve and control unit, clean with contact spray and tighten firmly
Check and replace fuses: Check injection system fuses in the fuse box and replace blown fuses
Diagnose the engine control unit: Have ECM/PCM tested for defects and repair or replace if necessary
Complete system diagnostics: Have professional OBD diagnostics carried out to rule out other hidden faults in the injection system

FAQ - Frequently asked questions about DTC P0272

Can I continue driving with error code P0272?

Short journeys are possible, but not recommended. The engine only runs on three cylinders, which can lead to increased wear and catalytic converter damage. A repair is urgently required as soon as possible.

How much does it cost to repair error code P0272?

The costs vary depending on the cause: injection valve replacement 150-400€, wiring repair 80-200€, control unit repair 300-800€. A precise diagnosis costs around €80-120.

How do I recognize a defective injection valve with P0272?

Typical signs are smooth engine running, especially when idling, reduced performance when accelerating and increased fuel consumption. A specialist can measure the electrical signals with an oscilloscope.

Can I repair error code P0272 myself?

Simple work such as cleaning plug connections or replacing fuses is possible. However, replacing the injection valve requires special tools and specialist knowledge of the fuel system.

How long does it take to repair P0272?

Depending on the cause: Clean plug connections 30 minutes, replace injection valve 1-2 hours, repair wiring 2-4 hours. The diagnosis takes an additional 30-60 minutes.

Does error code P0272 occur more frequently under certain driving conditions?

The code can occur under all driving conditions, but is often only noticed under higher loads or after longer journeys, when the defective injection valve noticeably impairs engine performance.

Vehicles in which error code P0272 occurs most frequently

Error code P0272 is a cross-manufacturer EOBD code that can occur in various vehicle brands, but is most common in the following vehicles:

Audi: A3, A4, A6, Q5 (2005-2015)
BMW: 3 Series, 5 Series, X3, X5 (2004-2014)
Mercedes-Benz: C-Class, E-Class, ML-Class (2006-2016)
Volkswagen: Golf, Passat, Tiguan, Touran (2005-2015)
Ford: Focus, Mondeo, S-Max, Galaxy (2007-2017)
Opel: Astra, Insignia, Zafira (2008-2016)

If the code P0272 occurs in your vehicle, you should first have a professional OBD diagnosis carried out to determine the exact cause. As fuel injectors are safety-relevant components and are under high pressure, it is advisable to visit a specialist workshop for more complex repairs. Early rectification prevents consequential damage to the engine and catalytic converter.

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