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Results are grouped by useful content—not by paid placement or guessed parts. Describe the symptom naturally; IAR recognizes common alternate wording while keeping exact codes and vehicle details precise.
Your available vehicle context is included where the destination supports it. AI guidance stays separate from verified IAR source records.
Electrical diagnosis follows the circuit and the evidence. A module-related code can be caused by supply, ground, wiring, communication, input, output, configuration, or the module itself.
System guideThe starting system must authorize the request and deliver high current long enough to rotate the engine. A no-crank condition is different from an engine that cranks normally but does not run.
System guideA transmission changes the relationship between engine or motor speed and wheel speed. Shift concerns can originate in fluid condition, controls, sensors, engine operation, mounts, driveline parts, or internal wear.
System guideThe cooling system moves heat away from the engine and releases it through controlled coolant flow and airflow. Overheating demands immediate safety judgment before diagnosis.
System guideHVAC comfort depends on airflow, heat exchange, temperature control, doors, sensors, and—for air conditioning—a sealed refrigerant system. Warm air alone does not identify a failed compressor.
System guideUse lamp behavior, symptoms, code status, freeze frame, readiness, and system tests to understand what the vehicle detected without treating a code as a parts order.
beginnerThe engine does not rotate when starting. Separate battery, cable, starter-control, interlock, security, and starter faults before replacing anything.
intermediateUse the first starting split—cranks or does not crank—to choose the correct electrical, authorization, fuel, ignition, or mechanical diagnostic path.
beginnerSeparate true transmission slip or shift flare from engine power loss, traction-control intervention, clutch concerns, and normal ratio changes before condemning a transmission.
professional recommendedCabin heat complaints can come from engine temperature, coolant level/circulation, airflow, blend-door/control operation, or an electric heat source on some vehicles.
intermediateReduced braking, unusually long stopping, or a vehicle that will not stop normally is a stop-driving condition. Secure the vehicle first, then separate hydraulic, assist, friction, mechanical, and control-system evidence with qualified service information.
professional recommendedRestore a safe rear-visibility workflow by separating a camera, reverse-input, power, ground, connector, display, network, or software concern before replacing a module.
intermediateSeparate fuel, spark, compression, timing, and security-system faults with a test-first process.
IntermediateSeparate missing ignition, fuel delivery, control, synchronization, and mechanical evidence after the engine is confirmed to crank.
Test-first procedureSeparate start-request, interlock, cable, ground, solenoid, and starter-motor evidence before bypassing the circuit or replacing the starter.
Test-first procedureUse warning behavior, scan context, cylinder pattern, and controlled contribution evidence to separate ignition, fuel, air, and mechanical branches.
Test-first procedureThe control module reported a vehicle-speed-signal condition. The standardized code identifies the monitored speed-signal category; it does not prove which sensor, wheel-speed source, wiring path, module, or communication path is responsible.
Generic codeThe control module reported vehicle-speed-signal behavior outside its expected relationship. The standardized code identifies the monitored speed-signal category; it does not prove which sensor, wheel-speed source, wiring path, module, or communication path is responsible.
Generic codeThe control module detected a vehicle-speed-signal input below the range expected by its monitoring strategy. The generic code does not prove which sensor, wheel-speed source, wiring path, module, or communication path is responsible.
Generic codeThe control module detected intermittent, implausible, or high vehicle-speed-signal behavior. The generic code does not prove which sensor, wheel-speed source, wiring path, module, or communication path is responsible.
Generic codeThe catalyst monitor determined that Bank 1 oxygen-storage performance was below its calibrated threshold. The code alone does not prove the converter is the original cause.
Generic codeThe catalyst monitor determined that Bank 2 oxygen-storage performance was below its calibrated threshold. The code alone does not prove the converter is the original cause.
Generic codeThe generic DTC identifies a vent-control circuit malfunction. It does not identify whether the fault is the vent device, wiring, connector, power/ground, control driver, or another exact-vehicle circuit condition.
Generic codeThe generic DTC identifies an open-circuit condition in the EVAP vent-control circuit. It does not prove the vent valve or solenoid itself is failed.
Generic codeThe generic DTC identifies a short-circuit condition in the EVAP vent-control circuit. It does not identify the exact location of the short or prove the vent device itself is the cause.
Generic codeThe generic DTC identifies a malfunction in the EVAP vent valve or solenoid control circuit. It is a circuit-level finding, not proof that the vent valve or solenoid should be replaced.
Generic codeIAR does not passively record this search. Save feedback only if you want a local note that you can export later for editorial planning. VIN-like vehicle identifiers are redacted before local save.