Choose the symptom or technical question that matches your enquiry. These 50 articles explain what to record, how to interpret the evidence and when specialist assessment is appropriate. They do not replace vehicle-specific repair instructions.
All diagnostic collections · Vehicle and module finder
Vehicle-network architecture and evidence
- A Vehicle Gateway Can Connect Different Network Technologies
- LIN Devices May Not Appear as Separate Modules on a Scanner
- Network Wake-Up and Normal Data Communication Are Different Checks
- A Diagnostic Tool Can Change the Vehicle’s Sleep Behaviour
- Network Error Counters Need Controller-Specific Interpretation
- CAN Bus Resistance Is Different at Different Test Locations
- A Network Short on One Branch Can Affect Several Reported Modules
- Automotive Ethernet Is Not Diagnosed Like an Ordinary USB Connection
- A Module Software Update Can Change Diagnostic Identification
- A Network Diagram from a Different Model Year Can Mislead Diagnosis
Software operations and configuration
- Coding File from Another Vehicle May Include Different Options
- Programming Tool Reports Success but the Module Version Is Unchanged
- ECU Update Stops Before Writing Begins
- Programming Session Completes but Another Module Needs Setup
- ECU Software Downgrade Is Not a Universal Recovery Method
- Module Configuration Lost After an Unauthorised Reset
- Tool Firmware and Vehicle Software Are Different Versions
- Vehicle Option Retrofit Needs Compatibility Beyond Coding
- A Read-Only Diagnostic Session Should Be Recorded Separately from Coding
- Checking the supported process for programming a used body module
Infotainment, reception and connectivity
- Infotainment Restarts Only When a Phone Is Connected
- Bluetooth Calls Work but Music Will Not Play
- One Speaker Crackles Across Every Audio Source
- All Audio Is Silent but the Screen and Volume Bar Work
- Radio Reception Is Poor After Rear-Window Replacement
- DAB Radio Drops Out but FM Reception Remains Normal
- Navigation Position Jumps to the Wrong Road
- Touchscreen Responds in the Wrong Place
- Infotainment Takes Much Longer to Start After Overnight Parking
- Emergency Call Warning After Roof or Aerial Work
Water exposure and recurring corrosion
- Water in the Spare-Wheel Well and Intermittent Electronics
- Damp Front Carpet with Body-Control Warnings
- Electrical Problems After a Drink Spill in the Centre Console
- Sunroof Drain Leak and Electrical Warnings
- Door Speaker Fails After Water Enters the Door
- Corrosion Returns After a Connector Was Cleaned
- A Module Was Dried with Heat Before Assessment
- Electrical Fault Appears Only When the Car Is Parked Nose-Down
- Saltwater Exposure Requires More Than a Drying Check
- Water-Damaged Module Replacement Still Leaves the Original Leak
Vans, conversions and working vehicles
- Van Sliding Door Warning Remains On After Closing
- Van Load-Area Lights Drain the Battery During Work
- Van Central Locking Leaves the Rear Doors Unsecured
- Van Electrical Fault Began After Ply Lining Was Installed
- Campervan Conversion and Repeated Low-Voltage Vehicle Warnings
- Refrigerated Van Electrical Warning When Cooling Equipment Starts
- Fleet Vehicle Tracker Installation and New Battery Drain
- Commercial Vehicle Reversing Alarm Sounds in the Wrong Gear
- Van Stop-Start Becomes Unavailable on a Delivery Route
- Fleet Repair Enquiry with Several Similar Vehicles
Need help choosing the next step?
Describe your fault or explore the main repair library. Confirm scope and arrangements before booking or dispatch. Workshop assessments take place in Didcot; suitable removed-module enquiries are welcome from across the UK.