P0186 Code - Fuel Temperature Sensor 'B' Circuit Range/Performance

What Does P0186 Mean?

P0186 is a generic OBD-II code that is triggered when the fuel temperature sensor B circuit goes out of range during self testing; the sensor voltage falls below or goes above the calibrated limit specifications during the self test.

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What are the common causes of P0186 ?

DTC P0186 may have number of causes:

• Electrical Short Circuit or Open Circuit – Wiring problems are usually the biggest problem affecting the FTS. Water entry, corrosion, and wire harness damage can all cause intermittent problems in the FTS-ECM circuit.
• Faulty Fuel Temperature Sensor or ECM – Neither of these is “common,” but that doesn’t mean they cannot fail. The FTS itself is a fairly bulletproof solid-state thermistor, and therefore isn’t a common failure point. The ECM, similarly, isn’t prone to failure, but can be induced by other problems, such as water entry or collision damage.

How do you troubleshoot P0186 ?

If all testing has passed so far yet you still have the same code, check your scan tool and see if it can open and close the IMRC valve. If the engine displays a miss and there wasn't a code, determine which cylinder is misfiring. If the exhaust manifold is visible, spay or pour a small amount of water on each cylinder exhaust port. Water will evaporate immediately on good cylinders and slowly on the missing cylinder. If this can't be accomplished pull the plugs and check the condition. Look for damage to the tank indicating impact that may have damaged the fuel pump or sender.

Process Tips

Diagnostic trouble code P0186 is not difficult to diagnose and repair. Thus, it always pays to have a qualified technician to look after your vehicle should this error code arise.

Diagnosing this code requires the engine to be in good running shape, without unmetered air entering the engine. If other codes that relates to misfiring condition, lean running or air entering the engine is present, then you must first fix those error codes before P0186.

Fortunately, P0186 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

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