P2E87

Code

Generic P — Powertrain

Proximity Detection Circuit B

Brand: Generic

Type: P — Powertrain

Views: UK: 15 EN: 29 RU: 19

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Read and record all stored/active codes and freeze frame data with a scan tool
Visually inspect sensor B, its wiring, and connectors for damage, corrosion, or contamination
Check for water, ice, mud or foreign objects on/around the sensor
Backprobe sensor connector to measure reference voltage, signal, and ground
Check continuity and resistance between sensor connector and control module
Perform an active test (if available) to exercise sensor B and observe live data

Typical sensor supply/reference: approx. 5 V (model dependent) — should be within ±0.5 V of spec
Typical sensor output: variable 0.2–4.8 V proportional to detected object distance (varies by design)
Ground continuity: low resistance to chassis ground (near 0 ohms); check for high resistance or intermittent
If PWM/LIN/CAN type sensor: expected message presence on network and proper message values when active
Open-circuit: infinite resistance; short to ground: near 0 ohms; short to battery: near battery voltage

Retrieve trouble codes and freeze-frame data. Note environment (speed, temp, gear) when fault occurred.
Perform a visual inspection of sensor B and harness: look for physical damage, contamination, moisture, or impact.
Clean sensor face and connectors, then clear the code. Re-test to see if the fault returns.
With key on engine off, backprobe the sensor connector: verify reference voltage, signal voltage (idle/no object), and ground continuity against module side. Compare to known-good values or service manual.
Wiggle test wiring and connectors while monitoring live data to reproduce intermittent faults. Repair any chafed or damaged wiring.
Measure resistance/continuity between sensor connector and the parking aid/control module pins. Repair open circuits or shorts.
If the sensor is removable, swap sensor B with a known-good sensor (or swap channels if system supports) to determine if fault follows the sensor or stays with the channel.
If fault follows the sensor, replace sensor B and retest. If fault remains on the channel, suspect wiring or control module driver.
Inspect and test module connector pins and module grounds. Repair/replace harness connectors or grounds as needed.
If wiring and sensors test good, consult vehicle manufacturer for control module bench tests, software updates, or module replacement procedures.
After repairs, clear codes and perform functional test (park assist active test and road test) to confirm repair.