DOCUMENTED DIAGNOSTIC CONTEXT

Diagnostic code articles — Page 39.

Understand what the recorded fault means, which findings change the diagnosis, and what the cited documentation can confirm. Each article states the system or vehicle scope it covers.

Some sources leave details unresolved. Those articles include a visible source note; a code match alone does not establish applicability to your vehicle.

Mazda TCU communication alerts and the information the dealer needs

Charger and 300 driver-door communication after a reset test

Mercedes M256 coolant-pump communication and insulation contact

Battery interface module A cannot be recovered on the serial chain

Battery interface module B is the unrecovered chain point

Module C cannot be reached after battery-chain recovery

Battery interface D remains unavailable in the recovery sequence

Battery interface E marks the unrecovered communication point

Battery interface module F cannot be recovered on the chain

Battery interface G remains unreachable after recovery

Battery interface H is not recovered by the communication test

battery-monitor LIN messages stop arriving

Brake control module B messages are missing on the main bus

Cherokee heated-seat communication and RA2 radio software

Pacifica steering-column messages before module replacement

Mach-E phone-as-key failure after an over-the-air update

A driver-door switch pack with a two-second LIN timeout

The driver's window code identifies the motor node, not the switch pack

The front-passenger window motor is a communicating node

The rear-left window has its own communication timeout code

The right-rear window-motor communication record

Flex instrument cluster missing liftgate-module messages

Rain and light functions share the sensor behind this code

Expedition and Navigator radar warnings need contamination and wiring checks

long-range radar protected bursts are missing

A column-lock message timeout seen by the instrument pack

Ford audio loss with DSP reset and programming

Lincoln Aviator audio loss and the DSP recovery test

2024 Mustang pre-collision warning after remote start

video-processing status messages exceed their timeout

left-front short-range radar burst timeout

right-front short-range radar data stops arriving

Expedition and Navigator running-board faults from DSM software

The body controller waits two seconds for front-infotainment data

2023 F-Super Duty history code after BCM self-test

Mach-E drive-mode fallback and coordinated software updates

Fiesta SYNC module missing display-control messages

F-150 HVAC and APIM agreement about a missing control panel

Fiesta audio controller losing the display-control module

Ram rear-camera communication versus surround-view failure

front-camera protected burst messages are missing

Front-view camera messages time out at the object controller

Escalade assistance and lighting faults from a fascia harness short

grille-shutter module A stops answering on LIN

grille shutter B LIN response timeout and a disabled calibration

Compass transmission-pump communication and paired repair

The BMS is missing secondary-axle motor-controller data

F-150 Lightning backup-power faults and gateway software history

A lost converter message does not by itself prove converter failure

NOx sensor A messages have several distinct timeouts

post-catalyst NOx sensor B communication timing

NOx sensor C ten-second message-loss supervision

particulate sensor messages are absent rather than implausible

charge-air cooler pump LIN response missing

the EVAP purge pump loses its LIN response

Software mismatch is different from software corruption

Mazda's BCM can report an error received from the PCM

Transmission software compatibility differs from network reachability

Checksum and counter errors behind Mazda's diesel U0305

Ford glow-plug module reports safe-glow mode

Mazda's brake-module error code is not an automatic software-update instruction

Mazda's brake error report changes sender with hybrid equipment

The body controller has received a transmission error signal

GM brake-module software compatibility mismatch

The PCM's steering-module error needs EPS evidence

body-module compatibility can involve ambient-temperature configuration

instrument-panel compatibility and an ambient-temperature status value

A steering-angle error signal received by Mazda's BCM

A PCM restraint-module error requires the SAS fault record

The driver-door supply unit behind Mazda's body-module-B label

received engine messages fail integrity checks

transmission estimated-gear data fails protection checks

transfer-case secondary-axle message fails integrity checks

wrong-length range-selector messages in a documented calibration

cruise-control status arrived with the wrong data length

Ford ECU does not receive the glow-module verification number

reductant controller messages fail counter or checksum checks

Drive-motor messages arrive with invalid freshness or authentication

Vehicle-integration data is rejected by different receiving modules

Four-wheel-drive data arrives but fails integrity checks