Code
B2872
MITSUBISHI
B — Body
Pump motor:short to ground
Views:
UK: 16
EN: 25
RU: 20
AI status
Completed
Completed
100%
Causes
- Damaged or chafed wiring contacting chassis ground
- Corroded or damaged connector at the pump
- Internal short inside the pump motor (armature/brushes)
- Failed pump relay or fuse (repeated failures may indicate short)
- Control module driver fault
- Water intrusion or contamination in connector or motor
Symptoms
- Pump does not run or runs intermittently
- Blown fuse or repeated fuse failures on the pump circuit
- Relevant system loss of function (depending on pump: fuel, A/C, coolant, washer, etc.)
- Battery drain or clicking relays when pump is commanded
- DTC B2872 stored and possibly lamp or system warning
What to check
- Read and record freeze-frame data and related stored codes
- Visual inspection of pump, connector, and wiring harness for damage, corrosion, or water ingress
- Check fuses and relays for the pump circuit
- Disconnect pump connector and see if code clears or changes
- Measure voltage at pump connector with the circuit commanded ON
- Measure resistance between pump power/drive wire and ground (with power removed)
Signal parameters
- Nominal supply voltage at pump connector when ON: ~12 V (vehicle battery voltage)
- Motor coil resistance: typically low (ohms); consult vehicle-specific spec
- Short-to-ground resistance: near 0 Ω between feed/drive wire and chassis ground when short present
- Expected current draw: depends on pump type (commonly 1–10 A for small motors; check spec)
- Control module output: may be steady 12 V or PWM drive (measure duty cycle/frequency with scope)
Diagnostic algorithm
- Retrieve codes and freeze-frame, and identify which pump (refer to vehicle service manual).
- Perform a visual inspection of the pump, harness, and connector for damage, corrosion, or water.
- With ignition OFF, disconnect the pump connector. Check resistance between the pump feed/drive pin and chassis ground. A very low resistance indicates a short to ground.
- Disconnect the pump and clear the code. If code does not return with pump disconnected, suspect the motor or pump harness as the cause.
- Inspect/repair visible wiring damage. If none found, perform a continuity check from the pump connector pin back to the control module/relay to locate a short.
- Bench-test the pump by applying fused 12 V directly to the pump motor ground and power pins (observe current draw and that motor runs smoothly). High current or no rotation suggests internal motor fault.
- If pump bench-test is good and no short is found in harness, test the control module/driver output with a scope or meter for correct drive behavior (watch for constant low resistance indicating a shorted driver transistor).
- Repair or replace damaged wiring, connector, or pump as indicated. Replace control module only after confirming external circuit is good and driver is faulty.
- After repair, clear codes and perform functional test/repeat cycles to verify the fault does not return.
Likely causes
- Wire insulation rubbed through where harness contacts metal, creating a direct ground
- Pump motor internal winding short to motor housing
- Connector pins corroded/bridged by moisture or debris
- Shorted output transistor inside the control module
Fault status
Status
Pump motor circuit short to ground detected — pump may be disabled until circuit is repaired.
Repair difficulty: Medium
Diagnostic time: 0.5-3.0 hours
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