Fault code P1793 – a step-by-step guide to diagnosing and fixing it

The meaning of error code P1793 – Intake Air Volume Circuit Malfunction

P1793: Causes, signs and repairs

Error code P1793 is displayed and the check engine light is on - what does this mean?

The OBD/EOBD system has detected a fault in the battery voltage or electrical system. This DTC P1793 indicates a low battery voltage or problems with the alternator. Depending on the vehicle manufacturer, the specific definitions may vary slightly, but generally relate to the electrical supply system.

What causes can this error code have?

Defective alternator
Weak or defective vehicle battery
Damaged cables in the charging system
Loose battery terminals or earth connections
Defective voltage regulator
Corroded plug connections
Overloading of the electrical system
Defective fuses in the charging system

What symptoms occur in parallel with fault code P1793?

Starting problems: The vehicle is difficult or impossible to start
Weak lighting: Headlights and interior lighting are dimmed
Battery light: The battery indicator light is illuminated in the dashboard
Irregular engine running: Engine runs unevenly or stutters at low engine speeds
Electrical failures: Radio, navigation or other electrical loads do not work properly
Loud background noises: Whistling or squealing noises from the alternator

How to fix the problem of error code P1793?

The repair requires a systematic check of the electrical system, starting with the basic components.
Measure the battery voltage and replace or charge the battery if the value is below 12.4V
Have the alternator checked and replace it completely if the charging capacity is defective
Check all cable connections between the battery and alternator for damage and replace defective cables
Clean battery terminals and earth connections, tighten and treat with terminal grease
Test the alternator voltage regulator individually and have it replaced if defective
Check fuses in the engine compartment and replace blown fuses
Check the alternator V-belt for tension and condition and tighten or replace if necessary

FAQ - Frequently asked questions about DTC P1793

Can I continue driving with error code P1793?

Short distances are possible, but not recommended. With P1793, there is a risk of the battery discharging completely while driving and the vehicle coming to a standstill. A prompt repair is urgently required.

How much does it cost to repair error code P1793?

The costs vary depending on the cause: a new battery costs €80-200, an alternator €200-600 including installation. Minor repairs such as changing cables or cleaning the terminals cost €50-150.

How can I delete error code P1793 myself?

After the repair, the code P1793 can be deleted with an OBD scanner. However, the fault code will return if the root cause has not been rectified. A professional diagnosis is recommended.

Is the trouble code P1793 manufacturer-specific?

Yes, P1793 is a manufacturer-specific EOBD code. The exact definition can vary between car brands, but usually refers to problems with the battery voltage or the charging system.

Can a low battery trigger fault code P1793?

Absolutely. A weak or faulty battery is one of the most common causes of P1793. Even a voltage below 12V can trigger this DTC and should be checked immediately.

What tools do I need to diagnose P1793?

For basic diagnostics, you need a multimeter for voltage measurement and an OBD scanner. Professional equipment is often required for a complete check of the alternator.

Vehicles in which error code P1793 occurs most frequently

Fault code P1793 is a manufacturer-specific trouble code that indicates problems with the battery voltage or the electrical system and can occur in various vehicle brands, but is most common in the following vehicles:

Ford: Focus, Fiesta, Mondeo, Kuga, Galaxy (2005-2018)
Mazda: Mazda3, Mazda6, CX-5, CX-3, MX-5 (2008-2020)
Volvo: XC90, XC60, S60, V70, S80 (2006-2016)
Jaguar: XF, XE, F-Pace, XJ, F-Type (2010-2019)
Land Rover: Discovery, Range Rover Sport, Evoque, Freelander (2007-2018)
Lincoln: Navigator, MKZ, MKX, Continental (2009-2020)

If the code P1793 occurs in your vehicle, you should first measure the battery voltage and have the charging system checked. As this error code is often related to electrical problems that can deteriorate quickly, a prompt diagnosis at a specialist workshop is recommended. Do not ignore this code, as it can lead to a complete failure of the electrical system.

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