Lost Communication With Exhaust Pressure Control Valve B Sensor/Switch
What it means
A module expected regular network messages from the exhaust pressure control valve B sensor or switch, which reports the position or state of a valve that controls exhaust back-pressure and has stopped receiving them. This is a communication fault: the part may still be working, but its reports are not reaching the other modules. The most common real-world cause is a power, ground or connector problem at the module that went quiet.
Can I keep driving? Usually yes short term, but power may be reduced; get it checked soon.
What this part does
The exhaust pressure control valve position sensor reports how far the exhaust pressure control valve is open. The engine computer compares it with the position it commanded to confirm that exhaust backpressure is being managed correctly. When it fails, you may see a warning light, reduced power, or changed engine braking.
Common symptoms
What you'll notice
- Check-engine light on
- Reduced power or limp mode
- Slow warm-up or exhaust-brake not working
- Poor turbo response
Common causes
Most likely first
- Damaged, loose or corroded connector or wiring at Exhaust Pressure Control Valve B Sensor/Switch
- Loss of power or ground (blown fuse, bad ground) at that module
- Network wiring fault or poor termination affecting several modules
- Failed sensor or module that is no longer sending messages
- Receiving module (usually the engine computer) fault
How to diagnose & fix
Work through it in order
- Read codes from all modules, not just the engine; several lost-communication codes together point to the network or power.
- Check fuses, power and ground at Exhaust Pressure Control Valve B Sensor/Switch and its control unit.
- Inspect its connector and wiring for corrosion, heat damage or chafing.
- Check the network wiring and connectors shared with other modules.
- Replace the part only if power, ground and network check out.
Related codes
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