Is it safe to drive with this code?

Driving may be possible in some cases, but the vehicle often operates in reduced-power mode and the hybrid system may not function correctly. Extended driving is not advisable as it can place additional strain on the petrol engine and may leave you stranded—refer to our disclaimer for further guidance.

It may affect your MOT result if the malfunction indicator lamp is illuminated at the time of the test, as emissions and on-board diagnostic checks form part of the MOT—see our disclaimer for more information.

Roughly how much does it cost to fix?

Costs vary considerably depending on the root cause. Simple wiring or sensor repairs typically fall into the low to mid three-figure range, whilst hybrid battery pack replacement can easily reach four-figure sums. Dealer labour rates and the need for specialist equipment often push costs toward the higher end—always obtain multiple quotes from specialists experienced with hybrid vehicles.

Can I reset the code and continue driving?

Clearing the code without addressing the underlying fault will typically result in it returning, often within a short distance. The voltage issue indicates a genuine system problem that requires diagnosis and repair rather than simply resetting the warning light.

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← All fault codes | Electrical & Sensors

P0AFE

Powertrain

Hybrid Battery System Voltage Too Low for Voltage Step Up Conversion

The hybrid battery pack voltage is too low for the step-up converter to operate correctly, which may prevent the high-voltage system from functioning properly.

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ⓘ Information only. This page provides general educational information about fault code P0AFE. 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 P0AFE mean?

P0AFE is a Powertrain (engine, transmission, fuel system) fault code. It indicates: Hybrid Battery System Voltage Too Low for Voltage Step Up Conversion.

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 Electrical & Sensors codes

Codes in the Electrical & Sensors category.

P0AFE is one of 4,010 codes in this category. Browse all Electrical & Sensors codes →

What we know about P0AFE 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 P0AFE.

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 P0AFE in the P-code series. Many fault codes appear together with their neighbours because they relate to the same circuit or component.

P0AFA Hybrid Battery System Voltage Low

P0AFB Hybrid Battery System Voltage High

P0AFC Hybrid Battery Pack Sensor Module

P0AFF System Voltage Too Low for Voltage Step Down Conversion

P0B00 Auxiliary Transmission Fluid Pump Motor Phase U Current

P0B01 Auxiliary Transmission Fluid Pump Motor Phase U Current Low

Other Electrical & Sensors codes

Other fault codes in the same system as P0AFE. The ones with detailed guides have plain-English explanations, symptoms, causes, and diagnostic steps.

B1257

Air Temperature External Sensor Circuit Short To Ground Detailed guide

B1363

DBPT Circuit Short To Ground Detailed guide

B2100

Ignition Run/Start Input Circuit Performance Detailed guide

C2000

Steering Angle Sensor Not Calibrated Detailed guide

P0030

HO2S Heater Control Circuit (Bank 1 Sensor 1) Detailed guide

P0031

Oxygen (A/F) Sensor Heater Control Circuit Low (Bank 1 Sensor 1) Detailed guide

Spotted an issue or have something to add? Mechanics, technicians, and drivers who have first-hand experience with P0AFE 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 →

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