B2606

Code

Other B — Body

A/C Temperature Sensor Out of Range

Brand: Other

Type: B — Body

Views: UK: 21 EN: 36 RU: 20

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Open or shorted sensor wiring or connector
Contaminated, damaged, or failed A/C/evaporator temperature sensor (NTC/thermistor)
Poor sensor ground or supply voltage fault
HVAC control module input circuit fault
Incorrect sensor installation or physical damage from debris or moisture
Intermittent connection due to pin corrosion or loose connector

Read and record freeze-frame and all stored HVAC/body codes with a scan tool
Visually inspect sensor location, connector, and wiring for damage or contamination
Check for presence of proper reference voltage and ground at the sensor connector
Measure sensor resistance/voltage and compare to expected values from service data
Backprobe connector while operating HVAC to observe live sensor data
Wiggle wiring harness while monitoring live data to identify intermittent faults

Typical thermistor resistance vs temperature: consult vehicle service manual (example NTC: higher resistance at cold, lower at hot).
Expected sensor voltage (if voltage-fed): commonly ~0.3–4.7 V depending on temp and vehicle
Open-circuit reading: infinite resistance or voltage at rail (over-range)
Short-circuit reading: near 0 Ω or voltage near ground (under-range) or near supply voltage if shorted to V+
Scan-tool reported evaporator/A/C temp range: typically -40°C to +120°C (vehicle-specific limits apply)

Connect a capable scan tool and record B2606 freeze-frame data and any related codes.
Confirm symptom: note cabin temp, HVAC mode, ambient temp, and whether A/C is requested.
Visual inspection: check sensor mounting (evaporator core/air duct), connector pins, and wiring for corrosion, damage, or foreign material.
With ignition ON (engine off unless service manual specifies otherwise), measure reference voltage and ground at the sensor connector. Compare to spec.
Measure sensor resistance at the connector (unplug sensor if required) and compare to temperature-resistance table from the service manual. If vehicle uses a voltage signal, backprobe and measure voltage while adjusting cabin/air temperature.
Perform a wiggle/inspect test while monitoring live data to detect intermittent opens/shorts.
If wiring and connector are good but sensor reads out-of-range, replace the sensor and re-test.
If new sensor still shows out-of-range but sensor bench checks OK, inspect/repair wiring between sensor and HVAC module, and test the module input with known good sensor or signal generator.
After repairs, clear codes, operate HVAC through temperature range, and verify code does not return under the same conditions; road/soak test if necessary.
If intermittent or module-related failures persist, consult vehicle-specific wiring diagrams and consider module bench testing or replacement per manufacturer guidance.