What does it mean?
B2601 is a Body (airbags, seat belts, body electronics) fault code. It indicates: Parking Sensor CPU Error .
Symptoms
- Parking sensors do not work at all when reverse is selected
- A continuous or repeating beep sounds when the system is engaged, warning that it has failed
- Park assist unavailable message appears on the display
- System reports a fault immediately at every start, without any obstacle present
- Distance display on the screen is missing or frozen
- Code returns straight away after being cleared
Likely causes
- Water intrusion into the parking aid module, which is often mounted in the rear quarter panel or behind trim near the boot floor
- Corroded module connector pins after moisture has tracked down the harness
- Unstable supply voltage, a weak battery or a poor ground causing the processor to reset
- Voltage spikes from jump starting, welding on the vehicle or a charger connected incorrectly
- Harness damage or connector disturbance following a rear bumper repair or towbar fitment
- Software fault in the module that requires an update or reconfiguration
- Genuine internal electronic failure of the parking sensor module
How to fix it
- Scan the parking aid module and record all stored codes, checking whether power supply or voltage codes are present alongside this one
- Test battery condition and charging voltage, since an unstable supply can trigger internal module errors
- Locate the module and inspect it for water, damp trim or corrosion around the connector
- Check supply voltage and ground at the module connector, including voltage drop under load
- Clean or repair corroded pins, dry the area and correct the source of the water leak
- Check whether an updated calibration or software is available for that module and apply it if so
- Replace and configure the parking aid module only if power, ground and wiring are proven good and the internal error persists