P2486 Exhaust Gas Temperature Sensor Circuit Low (Bank 2 Sensor 5)

P2486 is set when the signal of the fifth bank 2 exhaust probe sits below its lower electrical limit, typically because the lead or the probe itself shorts to ground. No manufacturer documents P2486 publicly; it presupposes two exhaust banks with five probes each. As an analogy, GM's diesel tables handle bank 1 probe 5 under P2481 with a resistance limit of 158 to 500 Ω depending on the year (under 1 Ω in 2025) and a debounce of 10 of 20 samples, Type B. CARB calls for out-of-range low checks on every such input. In the workshop, measure the probe resistance cold and compare it with a probe of the same type, then look for chafed insulation along the exhaust. Opposite limit: P2487; bank 1: P2481.

Likely causes

Symptoms

• Engine warning lamp
• Implausible reading of this probe

Repair estimate

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

Related codes

References: law.cornell.edu, gsi.ext.gm.com, gsi.ext.gm.com.