AutoCodes – Generic – P105B

P105B Code - Internal Control Module VVT Error Voltage Too Low

Quick Answer

On the Valvetronic VVT (Variable Valve Lift Control), the variable valve gear reduces fuel consumption by adjusting the stroke of the intake valves. Common causes include Battery voltage too low, Faulty Control Module Variable Valve Timing (VVT), Control Module VVT harness is open or shorted. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P105B indicates Internal Control Module VVT Error Voltage Too Low.
Common causes: Common causes include Battery voltage too low, Faulty Control Module Variable Valve Timing (VVT), Control Module VVT harness is open or shorted.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 9,939

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 11, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P105B Description

On the Valvetronic VVT (Variable Valve Lift Control), the variable valve gear reduces fuel consumption by adjusting the stroke of the intake valves. An electric motor is used to drive a worm gear that moves the eccentric shaft. The eccentric shaft uses intermediate levers that change the effect of the camshaft on the rocker arms. The Diagnostic Trouble Code (DTC) will be set when an excess current is recognized on the high side or low side transistors.

OBDII Code P105B - Internal Control Module VVT Error Voltage Too Low - AutoCodes.com — P105B Code - Internal Control Module VVT Error Voltage Too Low

What does this mean?

What are the Possible Causes of the DTC P105B?

Battery voltage too low
Faulty Control Module Variable Valve Timing (VVT)
Control Module VVT harness is open or shorted
Control Module VVT circuit poor electrical connection

How to Fix the DTC P105B?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P105B code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P105B code?

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Information for Specific Makes

P105B BMW — Internal Control Module VVT Error Voltage Too Low
P105B MINI — Internal Control Module VVT Error Voltage Too Low

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.