CAN High and CAN Low: Why Wire Names Are Not a Diagnosis
The labels CAN High and CAN Low identify signals in a particular network arrangement.
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Vehicle Networks and Gateways
CAN, LIN, Ethernet and gateway communication guides. Full scan reports and wiring context help distinguish network faults from failed modules.
U0110, U0111 and U0112: When an EV Controller Stops Talking
Drive-motor and battery-controller communication faults explained, with a practical checklist for an EV or hybrid diagnostic enquiry.
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U0141–U0145: Body-Module Communication and the BCM/BSI Naming Trap
Why body-module names and letter suffixes need vehicle-specific identification before a BCM or BSI repair enquiry.
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U0146–U0150: Gateway Faults and Why Several Modules Can Disappear Together
Understand gateway communication warnings and organise a useful scan report when multiple vehicle systems stop responding.
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CAN Bus Explained: Messages, Termination and the Limits of a 60-Ohm Reading
A plain-English introduction to CAN messages, physical wiring and why one resistance reading cannot certify a healthy network.
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EV Control Pilot Communication: Why Plugged In Does Not Always Mean Charging
Understand the communication behind an EV charging session and the evidence to save when a connected vehicle refuses to charge.
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DoIP Diagnostics: What a Garage Should Check When a Newer Module Will Not Connect
Newer vehicles may need DoIP-capable diagnostic equipment. Separate connection compatibility from a failed ECU before a garage referral.
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LIN Communication Faults: When a Local Device Stops Responding
Understand LIN communication faults, how a local network differs from CAN and what information helps identify a silent device or wiring problem.
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01325 and J502: Does Your Car Have a Separate TPMS Controller?
Before searching for a replacement J502 module, identify the fitted TPMS system and the complete 01325 fault description.
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01309 Power Steering J500: No Communication After a Warning or Repair
Understand the different VAG 01309 descriptions and the information needed when steering assistance or controller communication is lost.
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