What it means
Voltage on the charge air cooler coolant temperature B sensor signal line is above the expected window. Wire shorted to B+ or sensor open.
At a glance
- Usually lights the check-engine light
How it works
Charge air cooler coolant temperature sensor B sends a voltage signal representing the coolant temperature. This code sets when the signal rises above its expected range, which can happen if the signal wire is shorted to battery voltage or the sensor circuit is open.
Common causes
Most likely first.
- Signal wire shorted to B+
- Open or high-resistance signal/ground circuit
- Sensor fault
Symptoms
- Check-engine light may be on
- Reduced engine power
- Poor acceleration, especially under load
How to diagnose it
- Save freeze-frame data and check sensor B's live temperature for a reading that is implausibly high or fixed at an extreme.
- Inspect the sensor B connector and harness for loose or corroded terminals, broken wires, or insulation damage.
- Check the signal and ground circuit for an open or high resistance using the vehicle wiring information.
- With the circuit isolated as specified for the vehicle, test whether the signal wire is shorted to battery voltage.
- Test sensor B and its circuit against the manufacturer's specification to identify an open sensor or wiring fault.
Common fixes
- Reseat or clean loose and corroded sensor B connector terminals.
- Repair an open, high-resistance, or shorted signal or ground wire in the sensor B circuit.
- Replace charge air cooler coolant temperature sensor B if it fails the specified test.
Can I keep driving?
If the engine runs normally, limit driving to a short, gentle trip and avoid towing or hard acceleration because reduced power may occur under load. Stop if the engine loses substantial power or response becomes unsafe.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.