Is it safe to drive with this code?

Continued driving is generally not recommended, as a lean fuel condition on one cylinder can potentially lead to engine damage over time, including overheating of components or damage to the catalytic converter. The severity varies depending on how pronounced the issue is, but it's advisable to have the vehicle inspected promptly—see our disclaimer for guidance.

It may affect your MOT result if the malfunction indicator lamp (check engine light) is illuminated at the time of the test. The underlying fault itself could potentially affect emissions readings as well. What matters during the test is whether the warning light is on—see our MOT disclaimer for full details.

Roughly how much does it cost to fix?

Repair costs vary considerably depending on the root cause. A simple fix such as repairing a vacuum leak or replacing a faulty electrical connector might fall into the low three-figure range, whilst replacing a fuel injector on cylinder 12 typically costs in the mid to high three-figure bracket. If multiple components require replacement or extensive labour is needed to access cylinder 12 on certain engine configurations (particularly V12 engines), costs could reach the four-figure range. Independent garages typically charge less than main dealers for the same work.

Does P02C6 only occur in V12 engines?

Yes, this code is specific to cylinder 12, so it typically appears only in vehicles with 12-cylinder engines, such as certain high-performance or luxury models from manufacturers like Jaguar, Land Rover, or some premium European marques. Four-, six-, and eight-cylinder engines would trigger different cylinder-specific fuel trim codes.

Professional mechanic working in workshop

← All fault codes | Fuel System

P02C6

Powertrain

Cylinder 12 Fuel Trim at Max Limit

The engine management computer has detected that cylinder 12's fuel mixture correction has reached its maximum adjustment limit, typically indicating a significant lean condition that the system can no longer compensate for.

garage.co.uk

Need a garage?

Compare quotes from verified UK garages near you.

→

car.co.uk

Sell your car

We specialise in problem cars: warning lights, faults, high mileage. Fair instant offer.

→

trader.co.uk

List your car

Free private listing. Reach thousands of UK buyers, no fees.

→

ⓘ Information only. This page provides general educational information about fault code P02C6. We do not assess the urgency or safety implications of any specific fault. That requires in-person diagnosis by a qualified mechanic. Full terms.

Recommended next steps

Whether a fault is urgent, drivable, or routine depends entirely on the cause on a specific vehicle, and that can only be determined by a qualified mechanic with diagnostic equipment. If a warning light is illuminated, the most reliable next step is professional diagnosis.

What does P02C6 mean?

P02C6 is a Powertrain (engine, transmission, fuel system) fault code. It indicates: Cylinder 12 Fuel Trim at Max Limit.

This is a standardised OBD-II code. The technical definition is the same regardless of the make or model of vehicle, although specific causes and symptoms can vary between vehicles.

About Fuel System codes

Fuel system codes cover everything from the tank to the injectors: fuel pumps, filters, pressure regulators, rail pressure sensors, and injectors themselves. On modern common-rail diesels these codes can cause hard starting, limp mode, or no-start conditions.

P02C6 is one of 469 codes in this category. Browse all Fuel System codes →

What we know about P02C6 specifically

We record the SAE J2012 standardised definition and the system this code belongs to, but we have not yet published detailed driver-reported symptoms, common causes, or step-by-step diagnostic guidance for P02C6.

Rather than invent that information by generating generic content from a template, we leave it out. For specific guidance, the most reliable sources are:

•your vehicle's own service manual or manufacturer-specific technical bulletins
•a qualified mechanic with a manufacturer-level diagnostic tool
•a marque specialist familiar with your make and model

Codes nearby

Codes adjacent to P02C6 in the P-code series. Many fault codes appear together with their neighbours because they relate to the same circuit or component.

P02C3 Cylinder 11 Fuel Trim at Min Limit

P02C4 Cylinder 11 Injector Restricted

P02C5 Cylinder 11 Injector Leaking

P02C7 Cylinder 12 Fuel Trim at Min Limit

P02C8 Cylinder 12 Injector Restricted

P02C9 Cylinder 12 Injector Leaking

Other Fuel System codes

Other fault codes in the same system as P02C6. The ones with detailed guides have plain-English explanations, symptoms, causes, and diagnostic steps.

P0087

Fuel Rail/System Pressure - Too Low Detailed guide

P0089

Fuel Pressure Regulator 1 Performance Detailed guide

P0090

Fuel Pressure Regulator Control Circuit/Open Detailed guide

P0100

Mass or Volume Air Flow (MAF) Circuit Malfunction Detailed guide

P0106

Manifold Absolute Pressure/Barometric Pressure Circuit Range/Performance Problem Detailed guide

P0170

Fuel Trim Malfunction (Bank 1) Detailed guide

Spotted an issue or have something to add? Mechanics, technicians, and drivers who have first-hand experience with P02C6 can submit a correction or expansion. We review every submission before publishing, mechanic submissions are prioritised.

Information only, not professional advice

The information on this page is provided for general guidance and educational purposes only. It is not a substitute for diagnosis or repair advice from a qualified mechanic. Always verify any fault before paying for repairs. carfaultcodes.co.uk accepts no liability for decisions made based on this information. Full terms →

✎

Help us improve the P02C6 page

Spotted an error, missing detail, or have first-hand experience to add? Tell us, we review every submission.