Left Rear Park Aid Sensor Circuit Low
The left rear park aid sensor is not responding correctly.
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What it means (plain English)
The left rear parking sensor isn't providing a proper signal, which means it can't help your vehicle detect objects behind you while reversing.
What the computer is actually seeing
The vehicle's control module expects the left rear park aid sensor to output a certain voltage when activated, typically around 2.5 to 4.5 volts, indicating a clear path or an obstacle. When the module sees low voltage (close to 0 volts), it triggers the fault code B2427.
What a healthy reading looks like
Voltage output from the left rear park aid sensor should be between 2.5V and 4.5V.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Inspect the wiring and connectors for the left rear park aid sensor. Look for frayed wires or corrosion. Is the wiring intact?
- 22. Measure the voltage at the sensor connector while the vehicle is in reverse. Is the voltage between 2.5V and 4.5V?
- 33. If the voltage is low, replace the left rear park aid sensor and retest. Did the fault code clear?
- 44. If voltage is normal, inspect the vehicle's control module. Check for updates or faults. Is the control module functioning correctly?
Common causes
- Faulty left rear park aid sensor
- Wiring issues or damaged connectors
- Faulty control module
- Corrosion or moisture in the sensor connection
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, you can drive, but you should fix it soon since it affects the parking assist feature.
Will this code come back if I reset it?
It might come back if the underlying issue isn't fixed. Check the sensor and wiring first.
Why does this code appear with others like B2426?
Codes appear together because they may relate to similar systems or might indicate a cascading failure within the park aid system.
Working a real vehicle right now?
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